https://www.topolines.app/ weekly 1.0 https://www.topolines.app/home/handoff/figma.webp A TopoLines SVG pasted into Figma: contours, labels and grid as separate layers https://www.topolines.app/home/handoff/illustrator.webp A TopoLines SVG open in Illustrator: gradient contours over a grid, the Layers panel listing one group per contour level https://www.topolines.app/home/handoff/qgis.webp A TopoLines GeoJSON open in QGIS over OpenStreetMap, contours graduated by elevation, the status bar showing EPSG:4326 https://www.topolines.app/home/layers/01.webp Mont-Blanc massif contour map, contours only https://www.topolines.app/home/layers/02.webp Mont-Blanc massif contour map, with index lines https://www.topolines.app/home/layers/03.webp Mont-Blanc massif contour map, with elevation labels https://www.topolines.app/home/layers/04.webp Mont-Blanc massif contour map, with peak and grid annotations https://www.topolines.app/home/layers/05.webp Mont-Blanc massif elevation map in Points mode https://www.topolines.app/home/uses/kathmandu.webp Purna water flask mock-up over white contour lines and Himalayan peaks, Kathmandu https://www.topolines.app/home/uses/marseille.webp Marseille editorial poster: a large M on sage green beside the coastline in black contour lines https://www.topolines.app/home/uses/salt-lake-city.webp The Wasatch front as a blue dot field with a metric grid https://www.topolines.app/home/uses/santorini.webp Santorini caldera in blue-to-white gradient hairlines on black https://www.topolines.app/home/uses/innsbruck.webp Nordkette above Innsbruck, bold black contours and height labels on yellow https://www.topolines.app/home/uses/queenstown.webp The Remarkables and Lake Wakatipu in hypsometric colour contours on dark ground https://www.topolines.app/home/uses/cape-town.webp Table Mountain topographic sheet with labels, peaks, grid, scale bar and legend https://www.topolines.app/home/shipped/two-readings.webp Mont-Blanc massif traced once, as contour lines and as points https://www.topolines.app/home/shipped/exports.webp Mont-Blanc contours with index lines, height labels and a metric grid https://www.topolines.app/app weekly 0.8 https://www.topolines.app/blog weekly 0.7 https://www.topolines.app/topographic-map weekly 0.7 https://www.topolines.app/_astro/addis-ababa.BaOc-42X_23UYHB.webp Contour map of Addis Ababa https://www.topolines.app/_astro/ajaccio.DfWo7k47_10oxhq.webp Contour map of Ajaccio https://www.topolines.app/_astro/akureyri._RHZ-SZn_Z1jiwPA.webp Contour map of Akureyri https://www.topolines.app/_astro/alesund.AWW9Fr4e_28Vw4O.webp Contour map of Ålesund https://www.topolines.app/_astro/almaty.D-WhPR5S_2jgiR4.webp Contour map of Almaty https://www.topolines.app/_astro/amalfi.DzEKfwPC_jiL2C.webp Contour map of Amalfi https://www.topolines.app/_astro/andalsnes.CkxFniSg_Z2aubEv.webp Contour map of Åndalsnes https://www.topolines.app/_astro/andorra.CAMECl4l_nPvUr.webp Contour map of Andorra https://www.topolines.app/_astro/annecy.BNTnS8SY_2nuS9j.webp Contour map of Annecy https://www.topolines.app/_astro/antananarivo.u1ZD9PcV_tUFl7.webp Contour map of Antananarivo https://www.topolines.app/_astro/auronzo-di-cadore.BdQeyS3V_1tcvn4.webp Contour map of Auronzo di Cadore https://www.topolines.app/_astro/bariloche.nQsYkge0_1yBziu.webp Contour map of Bariloche https://www.topolines.app/_astro/bergen.C1_Rmw9m_WWRip.webp Contour map of Bergen https://www.topolines.app/_astro/bern.BE39SX4S_aVJSi.webp Contour map of Bern https://www.topolines.app/_astro/bishkek.BdNN0dd8_2of4e0.webp Contour map of Bishkek https://www.topolines.app/_astro/bogota.mpS9xMrL_86PS5.webp Contour map of Bogotá https://www.topolines.app/_astro/bolzano.BP0aa1l5_Z9E8a2.webp Contour map of Bolzano https://www.topolines.app/_astro/cagliari.Bz68gg8q_1lujDx.webp Contour map of Cagliari https://www.topolines.app/_astro/cape-town.DhBTpe-a_ZDdN3z.webp Contour map of Cape Town https://www.topolines.app/_astro/caracas.-P0P43kv_Z1QnY6X.webp Contour map of Caracas https://www.topolines.app/_astro/chamonix.i_aur-Fb_Z47Nww.webp Contour map of Chamonix https://www.topolines.app/_astro/chania.BzAd1cwl_1T3V2U.webp Contour map of Chania https://www.topolines.app/_astro/chongqing.BHmnWGFM_Z1cY1u0.webp Contour map of Chongqing https://www.topolines.app/_astro/cinque-terre.CTDeHc47_ZL6dRv.webp Contour map of Cinque Terre https://www.topolines.app/_astro/cortina-dampezzo.C6rnynxf_Zmwcxq.webp Contour map of Cortina d'Ampezzo https://www.topolines.app/_astro/courmayeur.DTf7cweW_1Od7gM.webp Contour map of Courmayeur https://www.topolines.app/_astro/cusco.B4NtB02v_1T16Qc.webp Contour map of Cusco https://www.topolines.app/_astro/dresden.VBYpFlnl_23Unhn.webp Contour map of Dresden https://www.topolines.app/_astro/flam.D0nVd3hm_1c4v3p.webp Contour map of Flåm https://www.topolines.app/_astro/funchal.aRCEhzUp_Z2kkyNY.webp Contour map of Funchal https://www.topolines.app/_astro/geiranger.Bhb5MLk6_ZzN5rn.webp Contour map of Geiranger https://www.topolines.app/_astro/genoa.BsAJI_1o_Z2qFuJG.webp Contour map of Genoa https://www.topolines.app/_astro/gibraltar.Bn30Mxnf_5XPLc.webp Contour map of Gibraltar https://www.topolines.app/_astro/grenoble.c9bn1stU_1Q7bjl.webp Contour map of Grenoble https://www.topolines.app/_astro/hong-kong.L6Xh9iLE_1zxlmr.webp Contour map of Hong Kong https://www.topolines.app/_astro/huancayo.BNJJHX5f_ZvmTp2.webp Contour map of Huancayo https://www.topolines.app/_astro/innsbruck.Bzc53pZg_T7lVn.webp Contour map of Innsbruck https://www.topolines.app/_astro/interlaken.DniGKCV2_q33Vu.webp Contour map of Interlaken https://www.topolines.app/_astro/isafjordur.Dhj3VPq3_1jufHU.webp Contour map of Ísafjörður https://www.topolines.app/_astro/kandersteg.DOZGYart_1IOmyN.webp Contour map of Kandersteg https://www.topolines.app/_astro/kathmandu.BbXqo3rj_Z1Cz8BL.webp Contour map of Kathmandu https://www.topolines.app/_astro/knjazevac.qNV_aZdS_2tC8wg.webp Contour map of Knjaževac https://www.topolines.app/_astro/lalpe-dhuez.DyJVvGa0_Z1cCVrX.webp Contour map of L'Alpe d'Huez https://www.topolines.app/_astro/la-paz.BqLmIeFn_1dRAqo.webp Contour map of La Paz https://www.topolines.app/_astro/liechtenstein.Di1P-ERp_ZdaYfv.webp Contour map of Liechtenstein https://www.topolines.app/_astro/ljubljana.7Cm05hGV_ZhD4dT.webp Contour map of Ljubljana https://www.topolines.app/_astro/lofoten.BkGaWAPd_Z12h7zQ.webp Contour map of Lofoten https://www.topolines.app/_astro/lugano.BUB4COYy_Z1yY3kX.webp Contour map of Lugano https://www.topolines.app/_astro/luxembourg.D2nFznxX_ZQhM9M.webp Contour map of Luxembourg https://www.topolines.app/_astro/lysefjord.DSMdrfXZ_Z11Cq4C.webp Contour map of Lysefjord https://www.topolines.app/_astro/malcesine.C2uJa0x7_17cSgn.webp Contour map of Malcesine https://www.topolines.app/_astro/malta.BwR69sEK_Z25HlYr.webp Contour map of Malta https://www.topolines.app/_astro/marsberg.DNSDQjZ1_ZdXpuV.webp Contour map of Marsberg https://www.topolines.app/_astro/marseille.DsUugmUa_ZfLf57.webp Contour map of Marseille https://www.topolines.app/_astro/medellin.CPed_Pno_Z1NTC70.webp Contour map of Medellín https://www.topolines.app/_astro/menton.DmVKZnp8_ZXT2qz.webp Contour map of Menton https://www.topolines.app/_astro/monaco.Bz5Cclvj_vb0PP.webp Contour map of Monaco https://www.topolines.app/_astro/montenegro.DSF2SyFc_10v64q.webp Contour map of Montenegro https://www.topolines.app/_astro/nafplio.xPy4cjDa_ZEpmkd.webp Contour map of Nafplio https://www.topolines.app/_astro/narvik.Cw0EJNVi_ZXOalr.webp Contour map of Narvik https://www.topolines.app/_astro/nice.BA9rb7lQ_Z12qLxo.webp Contour map of Nice https://www.topolines.app/_astro/niimi.CKEdYO2p_2iNKTV.webp Contour map of Niimi https://www.topolines.app/_astro/nuuk.CALIsfl4_STD4X.webp Contour map of Nuuk https://www.topolines.app/_astro/queenstown.0BKTguXM_Z2o8SH0.webp Contour map of Queenstown https://www.topolines.app/_astro/quito.ONZRDCCx_Z13PGse.webp Contour map of Quito https://www.topolines.app/_astro/rauris.BTpiCJ6o_Z2tEL1W.webp Contour map of Rauris https://www.topolines.app/_astro/reykjavik.D4UwY4Jv_lkCU8.webp Contour map of Reykjavík https://www.topolines.app/_astro/rio-de-janeiro.x5bOgCD1_ZTEI54.webp Contour map of Rio de Janeiro https://www.topolines.app/_astro/rottach-egern.Cep3IKBC_Z1kngGb.webp Contour map of Rottach-Egern https://www.topolines.app/_astro/salt-lake-city.BLlWEFH5_gQ2Ns.webp Contour map of Salt Lake City https://www.topolines.app/_astro/salzburg.DGxzgytG_Z19b7WK.webp Contour map of Salzburg https://www.topolines.app/_astro/san-francisco.jN6d9jSM_2d3AEW.webp Contour map of San Francisco https://www.topolines.app/_astro/san-marino.BHxmQ1rv_2dvkWI.webp Contour map of San Marino https://www.topolines.app/_astro/santiago.Dc6nhMxm_1jNGz5.webp Contour map of Santiago https://www.topolines.app/_astro/santorini.C2bSyguO_16nbBz.webp Contour map of Santorini https://www.topolines.app/_astro/sarajevo.D805EH0x_ZTMJAf.webp Contour map of Sarajevo https://www.topolines.app/_astro/seychelles.r0DPJXov_ZHXDF4.webp Contour map of Seychelles https://www.topolines.app/_astro/seydisfjordur.BFqTAxOI_1og0lh.webp Contour map of Seyðisfjörður https://www.topolines.app/_astro/tbilisi.DE4qMzMj_ZWL7KG.webp Contour map of Tbilisi https://www.topolines.app/_astro/thimphu.BLo1foAS_2bnVjQ.webp Contour map of Thimphu https://www.topolines.app/_astro/torshavn.ucXWgpgB_ZxX56H.webp Contour map of Tórshavn https://www.topolines.app/_astro/tromso.D4FXXYcU_CDGkk.webp Contour map of Tromsø https://www.topolines.app/_astro/trondheim.NDbifgEy_Z1LE4uS.webp Contour map of Trondheim https://www.topolines.app/_astro/turin.D9XxrzLJ_1CFtKI.webp Contour map of Turin https://www.topolines.app/_astro/ushuaia.B9cmptzi_Z2hXvK9.webp Contour map of Ushuaia https://www.topolines.app/_astro/vancouver.Cj4iPV8__Z1aCUir.webp Contour map of Vancouver https://www.topolines.app/_astro/vatican-city.Dx9aqH6j_ZvOWlf.webp Contour map of Vatican City https://www.topolines.app/_astro/wellington.BuuStWYZ_Z1x0si8.webp Contour map of Wellington https://www.topolines.app/_astro/whistler.B0zXmKGZ_Z2rNLJH.webp Contour map of Whistler https://www.topolines.app/_astro/yerevan.BvcKIPQr_1KhIwC.webp Contour map of Yerevan https://www.topolines.app/_astro/zermatt.Cq1eZr8x_1XWswH.webp Contour map of Zermatt https://www.topolines.app/contour-map-generator weekly 1.0 https://www.topolines.app/contour-lines/places/chamonix.webp Contour map of Chamonix, France https://www.topolines.app/contour-lines/places/amalfi.webp Contour map of Amalfi, Italy https://www.topolines.app/contour-lines/places/hong-kong.webp Contour map of Hong Kong, China https://www.topolines.app/contour-lines/places/geiranger.webp Contour map of Geiranger, Norway https://www.topolines.app/contour-lines/places/san-francisco.webp Contour map of San Francisco, United States https://www.topolines.app/contour-lines/places/rio-de-janeiro.webp Contour map of Rio de Janeiro, Brazil https://www.topolines.app/contour-lines/places/grenoble.webp Contour map of Grenoble, France https://www.topolines.app/contour-lines/places/wellington.webp Contour map of Wellington, New Zealand https://www.topolines.app/contour-lines/lines/terrain.webp White contour lines of the Sorrento peninsula stopping at the coastline, over a dark map https://www.topolines.app/contour-lines/lines/ramp.webp Mont-Blanc contours coloured by height, deep blue valleys to pale gold summits https://www.topolines.app/contour-lines/lines/taper.webp Mount Fuji contours, taper off on the left, taper on on the right https://www.topolines.app/contour-lines/lines/annotations.webp Puy de Pariou crater with height labels, depression ticks and dashed auxiliary lines https://www.topolines.app/home/handoff/figma.webp A TopoLines SVG opened in Figma, one layer group per elevation https://www.topolines.app/contour-lines/lines/interval-10.webp Chamonix contour lines at a 10 m interval https://www.topolines.app/contour-lines/lines/interval-25.webp Chamonix contour lines at a 25 m interval https://www.topolines.app/contour-lines/lines/interval-100.webp Chamonix contour lines at a 100 m interval https://www.topolines.app/contour-lines/more/points.webp Mount Rainier drawn as a field of white dots that swell toward the summit https://www.topolines.app/contour-lines/more/furniture.webp A scale bar, contour legend and north arrow in white on black https://www.topolines.app/contour-lines/more/exports.webp Teide contours in four strips labelled PNG, SVG, GeoJSON and DXF https://www.topolines.app/contour-lines/more/places.webp Contour maps of Bergen, Reykjavík and Vancouver side by side https://www.topolines.app/contour-lines/bleed/everest.webp Everest and Nuptse from Kala Patthar, prayer flags in the foreground https://www.topolines.app/pricing monthly 0.9 https://www.topolines.app/legal yearly 0.2 https://www.topolines.app/privacy yearly 0.2 https://www.topolines.app/terms yearly 0.2 https://www.topolines.app/faq monthly 0.8 https://www.topolines.app/help monthly 0.7 https://www.topolines.app/help/step-1-get-key.png Web app panel header showing the Figma API key popup with a copy button https://www.topolines.app/help/step-2-paste-key.png Figma plugin account popup with the API key field https://www.topolines.app/points monthly 0.8 https://www.topolines.app/points/rail/alpine.webp Dotted map of the Matterhorn and Monte Rosa in an Imhof gradient, peaks named https://www.topolines.app/points/rail/stipple.webp The Dolomites hand-stippled in black ink on cream paper https://www.topolines.app/points/rail/story.webp Kilimanjaro in blue crosses over a dark map, summit named https://www.topolines.app/points/rail/pattern.webp Table Mountain in orange squares over a metric grid https://www.topolines.app/points/rail/cover.webp Mount Fuji in large dots, red to pink duotone https://www.topolines.app/points/rail/merch.webp Lofoten islands in cyan to white dots over a dark map, peaks named https://www.topolines.app/points/plans/free.webp Mount Fuji in white dots on black, one ink colour https://www.topolines.app/points/plans/pro.webp The Mont Blanc massif in a fine grid of dots, green valleys to pink summits https://www.topolines.app/points/plans/sheet.webp Teide in black dots on white, with a scale bar, a dot-size legend and a north arrow https://www.topolines.app/points/also/sheet.webp Mount Rainier in black dots on white, with a scale bar, a dot-size legend and a north arrow https://www.topolines.app/contour-lines/lines/annotations.webp Puy de Pariou crater with height labels, depression ticks and dashed auxiliary lines https://www.topolines.app/contour-lines/more/exports.webp Teide contours in four strips labelled PNG, SVG, GeoJSON and DXF https://www.topolines.app/points/also/release.webp The Matterhorn twice: white contour lines on the left, white dots on the right https://www.topolines.app/points/bleed/valley.webp A limestone valley between grey peaks, a trail winding up through green pine scrub https://www.topolines.app/contour-lines-autocad monthly 0.8 https://www.topolines.app/cad/autocad-orbit.webp AutoCAD 2027 with the Chamonix contours in 3D: one index contour selected, the Properties palette reading 3D Polyline on CONTOUR_INDEX, Z 2750 in the status bar https://www.topolines.app/cad/autocad-layers.webp AutoCAD 2027 with the Layers palette open over the DXF: CONTOUR_INDEX, CONTOUR_INTERMEDIATE, CONTOUR_AUXILIARY, COASTLINE and the other TopoLines layers https://www.topolines.app/cad/autocad-plan.webp AutoCAD 2027, TopoLines contours (IGN RGE ALTI 1 m, Lambert-93) over the official cadastral plan of central Chamonix (DGFiP, Etalab 2.0): both in the same coordinate system, no move or scale https://www.topolines.app/cad/autocad-freeze.webp AutoCAD 2027, CONTOUR_INTERMEDIATE frozen in the Layers palette: only the orange index contours remain in the drawing https://www.topolines.app/cad/autocad-surface.webp AutoCAD 2027, shaded 3D view: a ruled LOFT surface through the 17 closed TopoLines contours of a summit, 3,610 to 3,770 m, above the other contours at their elevation https://www.topolines.app/cad/sketchup-terrain.webp Sandbox terrain of the Chamonix valley in SketchUp, the contours coloured by tag on the mesh, Tags panel open https://www.topolines.app/cad/rhino-ui-wide.webp TopoLines DXF of the Chamonix valley open in Rhino, with the contour layers in the Layers panel https://www.topolines.app/cad/dem-traced.webp TopoLines editor, 10 m contours traced from an uploaded IGN RGE ALTI GeoTIFF of the Cirque de Navacelles, 7.48 km² zone https://www.topolines.app/contour-lines-sketchup monthly 0.8 https://www.topolines.app/cad/sketchup-edges.webp SketchUp 2027 with the Chamonix contours in a tilted view, all 7,868 edges selected at their elevation, Entity Info reading 7868 Edges https://www.topolines.app/cad/sketchup-tags.webp SketchUp 2027 Tags panel after importing the DXF: CONTOUR_INDEX in orange and CONTOUR_INTERMEDIATE in grey, the contours coloured by tag https://www.topolines.app/cad/sketchup-import.webp SketchUp 2027 Import AutoCAD DWG/DXF options: Preserve drawing origin unticked, Units set to Meters https://www.topolines.app/cad/sketchup-sandbox.webp The terrain mesh built by Sandbox From Contours in SketchUp, 15,736 faces, the source contours hidden https://www.topolines.app/cad/autocad-orbit.webp AutoCAD 2027 with the Chamonix contours in 3D: one index contour selected, the Properties palette reading 3D Polyline on CONTOUR_INDEX, Z 2750 in the status bar https://www.topolines.app/cad/rhino-ui-wide.webp TopoLines DXF of the Chamonix valley open in Rhino, with the contour layers in the Layers panel https://www.topolines.app/cad/dem-traced.webp TopoLines editor, 10 m contours traced from an uploaded IGN RGE ALTI GeoTIFF of the Cirque de Navacelles, 7.48 km² zone https://www.topolines.app/contour-lines-rhino monthly 0.8 https://www.topolines.app/cad/rhino-orbit.webp Contours of the Chamonix valley in Rhino's Perspective view, each polyline at its real elevation from 1,520 to 3,780 m https://www.topolines.app/cad/rhino-layers.webp Rhino Layers panel after importing the DXF: CONTOUR_INDEX, CONTOUR_INTERMEDIATE, CONTOUR_AUXILIARY and COASTLINE layers https://www.topolines.app/cad/rhino-meshpatch.webp A MeshPatch mesh through the Chamonix contours in Rhino, shaded, with the contour lines on its surface https://www.topolines.app/cad/rhino-grasshopper.webp Grasshopper definition: the contours, Divide Curve at 40 points each, flattened into Delaunay Mesh; below, the resulting mesh previewed in Rhino https://www.topolines.app/cad/autocad-orbit.webp AutoCAD 2027 with the Chamonix contours in 3D: one index contour selected, the Properties palette reading 3D Polyline on CONTOUR_INDEX, Z 2750 in the status bar https://www.topolines.app/cad/sketchup-terrain.webp Sandbox terrain of the Chamonix valley in SketchUp, the contours coloured by tag on the mesh, Tags panel open https://www.topolines.app/cad/dem-traced.webp TopoLines editor, 10 m contours traced from an uploaded IGN RGE ALTI GeoTIFF of the Cirque de Navacelles, 7.48 km² zone https://www.topolines.app/dem-to-contour-lines monthly 0.8 https://www.topolines.app/cad/dem-qgis-dxf-geojson.webp QGIS 3.44 with the DXF and the GeoJSON exported from the same Navacelles zone: the DXF on its CONTOUR_INDEX and CONTOUR_INTERMEDIATE layers on the left, the GeoJSON in a second map view on the right, its attribute table listing elevation and type per contour https://www.topolines.app/cad/dem-settings.webp TopoLines Settings panel, 10 m interval, index contours on, simplification and minimum length, beside the contours traced from an uploaded GeoTIFF of the Cirque de Navacelles https://www.topolines.app/cad/dem-map-info.webp TopoLines Map info after the trace: elevation 270 to 701 m, and Source reading Uploaded DEM · 2 m (RGEALTI_2m_Navacelles_LAMB93.tif) https://www.topolines.app/cad/dem-upload-footprint.webp TopoLines editor, search mode menu set to DEM upload; the footprint of the uploaded GeoTIFF, 18.88 km² around the Cirque de Navacelles, outlined as a zone on the map https://www.topolines.app/cad/dem-navacelles-1m.webp Contours of the Cirque de Navacelles (Gard/Hérault), 2.1 × 1.6 km, traced from IGN RGE ALTI at 1 m: 10 m interval, index every 50 m https://www.topolines.app/cad/dem-navacelles-5m.webp The same Cirque de Navacelles zone traced from IGN RGE ALTI at 5 m, the step a larger zone is served at: 10 m interval, index every 50 m https://www.topolines.app/cad/dem-navacelles-30m.webp The same Cirque de Navacelles zone traced from the GEDTM30 30 m bare-earth model: 10 m interval, index every 50 m, smoother lines and less detail https://www.topolines.app/cad/autocad-orbit.webp AutoCAD 2027 with the Chamonix contours in 3D: one index contour selected, the Properties palette reading 3D Polyline on CONTOUR_INDEX, Z 2750 in the status bar https://www.topolines.app/cad/rhino-ui-wide.webp TopoLines DXF of the Chamonix valley open in Rhino, with the contour layers in the Layers panel https://www.topolines.app/cad/sketchup-terrain.webp Sandbox terrain of the Chamonix valley in SketchUp, the contours coloured by tag on the mesh, Tags panel open https://www.topolines.app/courbes-de-niveau-dxf monthly 0.8 https://www.topolines.app/cad/autocad-orbit.webp AutoCAD 2027, les courbes de Chamonix en 3D : une courbe maîtresse sélectionnée, la palette Propriétés indique Polyligne 3D sur CONTOUR_INDEX, Z 2750 dans la barre d'état https://www.topolines.app/cad/autocad-layers.webp AutoCAD 2027, la palette Calques ouverte sur le DXF : CONTOUR_INDEX, CONTOUR_INTERMEDIATE, CONTOUR_AUXILIARY, COASTLINE et les autres calques TopoLines https://www.topolines.app/cad/autocad-plan.webp AutoCAD 2027, courbes TopoLines (IGN RGE ALTI 1 m, Lambert-93) sur le plan cadastral officiel du centre de Chamonix (DGFiP, Etalab 2.0) : même système de coordonnées, ni déplacement ni mise à l'échelle https://www.topolines.app/cad/autocad-freeze.webp AutoCAD 2027, CONTOUR_INTERMEDIATE gelé dans la palette Calques : seules les courbes maîtresses orange restent dans le dessin https://www.topolines.app/cad/autocad-surface.webp AutoCAD 2027, vue 3D ombrée : surface LOFT réglée à travers les 17 courbes fermées TopoLines d'un sommet, de 3 610 à 3 770 m, au-dessus des autres courbes à leur altitude https://www.topolines.app/cad/dem-traced.webp TopoLines editor, 10 m contours traced from an uploaded IGN RGE ALTI GeoTIFF of the Cirque de Navacelles, 7.48 km² zone https://www.topolines.app/docs monthly 0.6 https://www.topolines.app/docs/editor-lines.webp The TopoLines editor with a contour trace of the Mont Blanc massif https://www.topolines.app/changelog weekly 0.5 https://www.topolines.app/atlas monthly 0.7 https://www.topolines.app/colorado-elevation-map monthly 0.7 https://www.topolines.app/colorado/colorado-state.webp Elevation map of Colorado in contour lines: blue Eastern Plains on the right, the Front Range, Sawatch and San Juan Mountains in gold and white, the flat San Luis Valley in the south https://www.topolines.app/colorado/pikes-peak.webp Topographic contour map of Pikes Peak and Colorado Springs, summit contours in white, the plains in blue to the east https://www.topolines.app/colorado/mount-elbert.webp Topographic contour map of Mount Elbert and Mount Massive in the Sawatch Range, with the Arkansas valley near Leadville in blue https://www.topolines.app/atlas/accuracy-and-limits 2026-11-05 monthly 0.7 https://www.topolines.app/atlas/accuracy/pipeline-raw.webp Contours traced on the raw grid https://www.topolines.app/atlas/accuracy/pipeline-smooth.webp Contours after Gaussian smoothing https://www.topolines.app/atlas/accuracy/pipeline-simple.webp Contours after simplification https://www.topolines.app/atlas/choosing-a-contour-interval 2026-11-05 monthly 0.7 https://www.topolines.app/atlas/interval-maps/usgs24k-a.webp USGS 1:24,000 map near Urbana, Illinois, with 5 ft contours https://www.topolines.app/atlas/interval-maps/usgs24k-b.webp USGS 1:24,000 map of Mount St. Helens with 40 ft contours https://www.topolines.app/atlas/interval/s25k-i5.webp Contour lines of the Puy de Dôme at 1:25,000 with a 5 m interval. https://www.topolines.app/atlas/elevation-data-france 2026-11-05 monthly 0.7 https://www.topolines.app/atlas/france/mns-a.webp Shaded LiDAR HD surface model: roofs and trees visible https://www.topolines.app/atlas/france/mns-b.webp Shaded LiDAR HD terrain model: bare ground only https://www.topolines.app/atlas/france/sources.webp Map of mainland France and Corsica coloured by the source of each part of RGE ALTI: lidar, image correlation, radar, BD ALTI https://www.topolines.app/atlas/france/radar-a.webp Contours every 20 m from RGE ALTI: smooth slopes https://www.topolines.app/atlas/france/radar-b.webp Contours every 20 m from LiDAR HD: every gully drawn https://www.topolines.app/atlas/elevation-data-united-states 2026-11-05 monthly 0.7 https://www.topolines.app/atlas/us/3dep-a.webp Contours every 10 m from USGS 3DEP https://www.topolines.app/atlas/us/3dep-b.webp Contours every 10 m from GEDTM30 https://www.topolines.app/atlas/elevation-data-mistakes 2026-11-05 monthly 0.7 https://www.topolines.app/atlas/mistakes/dsm-a.webp Contours every 2 m from Copernicus GLO-30: tight bundles around every wood https://www.topolines.app/atlas/mistakes/dsm-b.webp Contours every 2 m from RGE ALTI: a smooth valley and plateau https://www.topolines.app/atlas/mistakes/feet-a.webp Puy de Dôme contoured every 10 m from heights in metres https://www.topolines.app/atlas/mistakes/feet-b.webp The same area with heights in feet read as metres: lines 3.28 times denser https://www.topolines.app/atlas/mistakes/geoid.webp Diagram: ground, geoid and ellipsoid, with h, H and N https://www.topolines.app/atlas/mistakes/degrees-a.webp Hillshade of a grid in degrees shown with square cells: relief stretched east–west https://www.topolines.app/atlas/mistakes/degrees-b.webp Hillshade of the same grid with its true cell sizes https://www.topolines.app/atlas/mistakes/exaggeration.webp The same terrain profile drawn at vertical exaggeration ×1, ×2 and ×5 https://www.topolines.app/atlas/mistakes/nodata-a.webp Contours with a void read as 0 m: a black ring and a wall along the edge https://www.topolines.app/atlas/mistakes/nodata-b.webp The same contours with the void declared as NoData, shown grey https://www.topolines.app/atlas/mistakes/resample-a.webp Staircase contours from a nearest-neighbour upsampled DEM https://www.topolines.app/atlas/mistakes/resample-b.webp Smooth contours from the same DEM upsampled bilinearly https://www.topolines.app/atlas/mistakes/interval-a.webp Flat ground contoured every 1 m: a maze of tiny loops https://www.topolines.app/atlas/mistakes/interval-b.webp The same ground every 5 m: a few clean lines https://www.topolines.app/atlas/france/sources.webp Map of mainland France and Corsica coloured by the source of each part of RGE ALTI: lidar, image correlation, radar, BD ALTI https://www.topolines.app/atlas/mistakes/helens-a.webp USGS 1958 map of Mount St. Helens with its summit at 9,677 ft https://www.topolines.app/atlas/mistakes/helens-b.webp USGS 1983 map of the same area showing the 1980 crater and lava dome https://www.topolines.app/atlas/global-elevation-models 2026-11-05 monthly 0.7 https://www.topolines.app/atlas/global/models-cop.webp Contours from Copernicus GLO-30 following the woods https://www.topolines.app/atlas/global/models-gedtm.webp Contours from GEDTM30 with forest artefacts left https://www.topolines.app/atlas/global/models-ref.webp Contours from RGE ALTI lidar: a clean valley https://www.topolines.app/docs/cartographic-options 2026-10-02 monthly 0.6 https://www.topolines.app/docs/export-panel.webp Export panel with Scale bar, North arrow and Legend toggles https://www.topolines.app/docs/datasets 2026-10-21 monthly 0.6 https://www.topolines.app/docs/elevation-data 2026-10-21 monthly 0.6 https://www.topolines.app/docs/precision-menu.webp Precision menu: Auto, Standard GEDTM30 30 m, HD 10 m https://www.topolines.app/docs/map-info.webp Map info panel: elevation range, relief, scale, CRS and source https://www.topolines.app/docs/exports-and-plans 2026-09-28 monthly 0.6 https://www.topolines.app/docs/export-formats.webp Export format menu: PNG Low, Medium, High, SVG, GeoJSON, DXF https://www.topolines.app/docs/line-styling 2026-10-19 monthly 0.6 https://www.topolines.app/docs/render-modes 2026-09-28 monthly 0.6 https://www.topolines.app/docs/zone-lines.webp Mont Blanc massif rendered as contour lines https://www.topolines.app/docs/zone-points.webp The same zone rendered as points https://www.topolines.app/docs/points-controls.webp Points section of the editor: colour, Density, Shape, Size min/max, Placement https://www.topolines.app/blog/carte-topographique-svg 2026-07-12 monthly 0.6 https://www.topolines.app/_astro/cover-carte-topographique-svg.Bo8t_mpQ_QvzCN.jpeg Carte topographique en SVG : le bon format pour affiches et découpe laser Quand exporter une carte topographique en SVG plutôt qu'en PNG ou DXF, et pourquoi un SVG groupé par altitude change tout pour l'impression. https://www.topolines.app/_astro/cover-carte-topographique-svg.Bo8t_mpQ_Z1LVzcy.webp Carte topographique en SVG : le bon format pour affiches et découpe laser https://www.topolines.app/blog/contour-map-laser-cutting 2026-10-03 monthly 0.6 https://www.topolines.app/_astro/cover-contour-map-laser-cutting.DhOV62GX_28yxw3.jpeg Laser Cut Topographic Map: Make Layered Topo Maps of Any Place How to make a laser cut topographic map from real elevation data: choosing the interval, a cut-ready SVG, stacking layers, mistakes to avoid. https://www.topolines.app/_astro/cover-contour-map-laser-cutting.DhOV62GX_Z1pzq5j.webp Laser Cut Topographic Map: Make Layered Topo Maps of Any Place https://www.topolines.app/blog/contour-map-svg 2026-07-12 monthly 0.6 https://www.topolines.app/_astro/cover-contour-map-svg.CLebm6Xf_Z2mDNX.jpeg Contour Map SVG: The Right Format for Posters, Laser Cutting and Design When to export a contour map as SVG instead of PNG, DXF or KMZ, and why a layered SVG grouped by elevation matters for print and laser cutting. https://www.topolines.app/_astro/cover-contour-map-svg.CLebm6Xf_2m7k6F.webp Contour Map SVG: The Right Format for Posters, Laser Cutting and Design https://www.topolines.app/blog/contour-map-tools-compared 2026-10-11 monthly 0.6 https://www.topolines.app/_astro/cover-contour-map-tools-compared.BtcUE5tl_4YMhg.jpeg Contour Map Creator vs TopoExport vs TopoLines: Which Contour Tool for Which Job An honest comparison of three online contour map tools: what each one exports, what data it uses, what it costs on the same area, and when you should pick the other one. https://www.topolines.app/_astro/cover-contour-map-tools-compared.BtcUE5tl_Z2rh46A.webp Contour Map Creator vs TopoExport vs TopoLines: Which Contour Tool for Which Job https://www.topolines.app/blog/curvas-de-nivel-topografia 2026-10-04 monthly 0.6 https://www.topolines.app/_astro/cover-curvas-de-nivel-topografia.BobPVd9p_YEdqt.jpeg Curvas de nivel: qué son, cómo leerlas y para qué sirven en topografía Qué son las curvas de nivel, cómo leer un plano, qué es la equidistancia y cómo se usan en topografía y agricultura, con ejemplos reales. https://www.topolines.app/_astro/cover-curvas-de-nivel-topografia.BobPVd9p_Z1wBCWn.webp Curvas de nivel: qué son, cómo leerlas y para qué sirven en topografía https://www.topolines.app/blog/diagrams/contour-slices-es.webp Diagrama: un cerro visto de perfil, cortado por planos horizontales a 100, 200, 300 y 400 metros; líneas punteadas proyectan cada corte sobre la vista en planta, donde los cortes se convierten en curvas de nivel concéntricas https://www.topolines.app/contour-lines/lines/annotations.webp Cráter del Puy de Pariou dibujado con curvas maestras acotadas, marcas de depresión dentro del cráter y curvas auxiliares discontinuas https://www.topolines.app/contour-lines/lines/interval-10.webp El valle de Chamonix y el macizo del Mont Blanc con una equidistancia de 10 metros — curvas densas que muestran cada detalle del relieve https://www.topolines.app/contour-lines/lines/interval-100.webp La misma zona de Chamonix con una equidistancia de 100 metros — pocas curvas, solo las grandes formas del relieve https://www.topolines.app/blog/diagrams/contour-slopes-es.webp Diagrama de cuatro perfiles de ladera — empinada, suave, cóncava y convexa — cada uno sobre la separación de curvas que produce en planta https://www.topolines.app/blog/diagrams/contour-landforms-es.webp Plano de curvas de nivel anotado con dos cimas, el collado entre ellas, una loma cuyas curvas apuntan cuesta abajo, un valle cuyas curvas apuntan cuesta arriba a lo largo de un arroyo y una depresión marcada con trazos https://www.topolines.app/blog/curvas-de-nivel 2026-10-04 monthly 0.6 https://www.topolines.app/_astro/cover-curvas-de-nivel.DH9U64Ym_2o7BaH.jpeg Curvas de nível: o que são, como ler e como fazer (com exemplos) O que é curva de nível, como ler um mapa de curvas de nível, o que é a equidistância e para que servem na topografia e na agricultura. https://www.topolines.app/_astro/cover-curvas-de-nivel.DH9U64Ym_ZhzxHA.webp Curvas de nível: o que são, como ler e como fazer (com exemplos) https://www.topolines.app/blog/diagrams/contour-slices-pt.webp Diagrama: um morro visto de perfil, cortado por planos horizontais a 100, 200, 300 e 400 metros; linhas pontilhadas projetam cada corte na vista de cima, onde os cortes viram curvas de nível concêntricas https://www.topolines.app/contour-lines/lines/annotations.webp Cratera do Puy de Pariou desenhada com curvas mestras cotadas, traços de depressão dentro da cratera e curvas auxiliares tracejadas https://www.topolines.app/contour-lines/lines/interval-10.webp Vale de Chamonix e maciço do Mont Blanc com equidistância de 10 metros — curvas densas que mostram cada detalhe do relevo https://www.topolines.app/contour-lines/lines/interval-100.webp A mesma área de Chamonix com equidistância de 100 metros — poucas curvas, só as grandes formas do relevo https://www.topolines.app/blog/diagrams/contour-slopes-pt.webp Diagrama de quatro perfis de encosta — íngreme, suave, côncava e convexa — cada um acima do espaçamento de curvas que produz na vista de cima https://www.topolines.app/blog/diagrams/contour-landforms-pt.webp Mapa de curvas de nível anotado com dois topos, a sela entre eles, um espigão com curvas apontando morro abaixo, um vale com curvas apontando morro acima ao longo de um córrego e uma depressão marcada com traços https://www.topolines.app/contour-lines/places/rio-de-janeiro.webp Mapa de curvas de nível do Rio de Janeiro: o maciço da Tijuca com o Pico da Carioca, o Corcovado e a Pedra do Conde, em linhas brancas sobre fundo preto https://www.topolines.app/blog/designing-contour-art 2026-02-18 monthly 0.6 https://www.topolines.app/_astro/cover-designing-contour-art.Cvx791yr_Z1zW63D.jpeg Designing with contour line art How to turn real contour lines into posters, covers and brand patterns: choosing the place, the interval, line weight, colour and format. https://www.topolines.app/_astro/cover-designing-contour-art.Cvx791yr_1DzBDk.webp Designing with contour line art https://www.topolines.app/contour-lines/places/amalfi-640.webp Contour lines of the Amalfi coast: dense lines along the cliffs, empty sea below https://www.topolines.app/blog/gedtm30-vs-lidar 2026-10-05 monthly 0.6 https://www.topolines.app/_astro/cover-gedtm30-vs-lidar.D0fx5QH__2fpuEg.jpeg Bare earth or treetops? We tested GEDTM30 against lidar Why TopoLines traces from GEDTM30 by default: a side-by-side check against Copernicus GLO-30 and national lidar at ten sites, from forests to cities. https://www.topolines.app/_astro/cover-gedtm30-vs-lidar.D0fx5QH__1rLbyL.webp Bare earth or treetops? We tested GEDTM30 against lidar https://www.topolines.app/blog/gedtm30-vs-lidar/rmse-by-site.webp Bar chart of error against lidar at eight sites. Under forest Copernicus is off by 15 to 37 m and GEDTM30 by 5 to 18 m; on farmland and in cities both are within 1 to 5 m https://www.topolines.app/blog/gedtm30-vs-lidar/profile-smokies.webp Elevation profile across the Great Smoky Mountains: the Copernicus line runs well above the lidar ground, the GEDTM30 line follows it closely; lower panel shows each model minus lidar https://www.topolines.app/blog/gedtm30-vs-lidar/overlay-smokies.webp Contour lines of the same Great Smoky Mountains area drawn three times: lidar in blue, GEDTM30 in black lying close to it, Copernicus in red shifted away https://www.topolines.app/blog/generateur-carte-topographique 2026-06-20 monthly 0.6 https://www.topolines.app/_astro/cover-generateur-carte-topographique.c_1e7uHZ_1YT1Rn.jpeg Générateur de carte topographique : créer des courbes de niveau en ligne Un générateur de carte topographique en ligne : des données d'altitude réelles en courbes de niveau, exportées en SVG vectoriel ou PNG HD. https://www.topolines.app/_astro/cover-generateur-carte-topographique.c_1e7uHZ_Dp5wL.webp Générateur de carte topographique : créer des courbes de niveau en ligne https://www.topolines.app/blog/generer-traces-topographiques 2026-06-19 monthly 0.6 https://www.topolines.app/_astro/cover-generer-traces-topographiques.tBRwe7_A_Z1eUMqF.jpeg Courbes de niveau : générer une carte en ligne Générer une carte avec courbes de niveau depuis l'altitude réelle : lire les courbes, choisir l'équidistance, partir des données IGN, exporter en SVG ou DXF. https://www.topolines.app/_astro/cover-generer-traces-topographiques.tBRwe7_A_1CtKwl.webp Courbes de niveau : générer une carte en ligne https://www.topolines.app/blog/how-to-draw-contour-lines 2026-11-04 monthly 0.6 https://www.topolines.app/_astro/cover-how-to-draw-contour-lines.nBPjoxze_12ubk.jpeg How to Draw Contour Lines on a Topographic Map (Step by Step) How to draw contour lines by hand from spot heights, step by step: the rules, interpolation, a topographic profile, then AutoCAD / Civil 3D, SketchUp, and generating them from elevation data. https://www.topolines.app/_astro/cover-how-to-draw-contour-lines.nBPjoxze_1x5EnT.webp How to Draw Contour Lines on a Topographic Map (Step by Step) https://www.topolines.app/blog/diagrams/contour-interpolation.webp Two-panel diagram. Left: thirty spot heights joined into triangles, with orange marks where 180 metres falls on each edge and a worked example on one blue edge between 146 m and 201 m. Right: the resulting contour lines at 140, 160, 180, 200 and 220 metres, with the 180 m line in orange https://www.topolines.app/blog/diagrams/contour-profile.webp Diagram: a contour map of two hills crossed by a section line A–B, with orange dots where the line crosses each contour; dotted lines drop each dot onto a height grid below, where the dots are joined into the profile of the two hills https://www.topolines.app/blog/lidar-elevation-europe 2026-10-03 monthly 0.6 https://www.topolines.app/_astro/cover-lidar-elevation-europe.DBGbQhVd_18wD1c.jpeg HD terrain data for England, Austria, Switzerland, Italy and Germany TopoLines HD exports now trace from national lidar models in England, Austria, Switzerland, Italy and parts of Germany, picked automatically. https://www.topolines.app/_astro/cover-lidar-elevation-europe.DBGbQhVd_QhlSc.webp HD terrain data for England, Austria, Switzerland, Italy and Germany https://www.topolines.app/blog/qgis-contour-lines 2026-10-05 monthly 0.6 https://www.topolines.app/_astro/cover-qgis-contour-lines.KJW5qZDz_1tptmt.jpeg How to Make Contour Lines in QGIS (Step by Step, and a Faster Way) Generate contour lines in QGIS from a DEM: where to get elevation data, clipping, CRS, the GDAL Contour tool, intervals, index contours, smoothing and SVG export. Plus the no-GIS shortcut. https://www.topolines.app/_astro/cover-qgis-contour-lines.KJW5qZDz_v6lFX.webp How to Make Contour Lines in QGIS (Step by Step, and a Faster Way) https://www.topolines.app/contour-lines/lines/interval-25.webp Contour lines of the Chamonix valley traced at a 25 metre interval https://www.topolines.app/blog/svg-vector-export 2026-06-08 monthly 0.6 https://www.topolines.app/_astro/cover-svg-vector-export.HmqOHw4j_1DdndC.jpeg Vector SVG export, ready for print and Figma Export your contour maps as clean, layered SVG — infinitely scalable, print-ready, and editable straight in Figma or Illustrator. https://www.topolines.app/_astro/cover-svg-vector-export.HmqOHw4j_Z1GQkSb.webp Vector SVG export, ready for print and Figma https://www.topolines.app/blog/national-lidar-dtm-over-http 2026-10-19 monthly 0.6 https://www.topolines.app/_astro/cover-national-lidar-dtm-over-http.8YYbzKZe_cTyMe.jpeg Reading nine national terrain models (mostly lidar) over HTTP Field notes on reading open national DTMs (IGN, USGS 3DEP, swissALTI3D, EA lidar, BEV, TINITALY, DGM1…) over WMS, WCS and COG tiles in Python, without downloading a country. https://www.topolines.app/_astro/cover-national-lidar-dtm-over-http.8YYbzKZe_Z21xTsj.webp Reading nine national terrain models (mostly lidar) over HTTP https://www.topolines.app/blog/topographic-contour-lines 2026-06-19 monthly 0.6 https://www.topolines.app/_astro/cover-topographic-contour-lines.DYwqhTei_SuyN9.jpeg What Is a Contour Map? How to Read Contour Lines (With Examples) What is a contour map? How contour lines work, the rules they follow, how to read slopes, peaks, ridges and valleys, and how to make your own. https://www.topolines.app/_astro/cover-topographic-contour-lines.DYwqhTei_2pxJ0I.webp What Is a Contour Map? How to Read Contour Lines (With Examples) https://www.topolines.app/blog/diagrams/contour-slices.webp Diagram: a hill seen from the side, cut by horizontal planes at 100, 200, 300 and 400 metres; dotted lines project each cut down onto the top view, where the cuts become nested contour loops https://www.topolines.app/contour-lines/lines/annotations.webp Puy de Pariou crater drawn with labelled index contours, depression tick marks inside the crater and dashed supplementary contours https://www.topolines.app/blog/diagrams/contour-slopes.webp Diagram of four slope profiles — steep, gentle, concave and convex — each above the contour line spacing it produces in top view https://www.topolines.app/blog/diagrams/contour-landforms.webp Annotated contour map showing two peaks, a saddle between them, a ridge whose contours point downhill, a stream valley whose contours point uphill, and a depression marked with tick marks https://www.topolines.app/blog/topographic-map-figma 2026-07-21 monthly 0.6 https://www.topolines.app/_astro/cover-topographic-map-figma.rxDnTC5X_z9WWM.jpeg How to Make a Topographic Map in Figma How to make a topographic map in Figma: generate contour lines for any place from real elevation data and import a clean, layered SVG. https://www.topolines.app/_astro/cover-topographic-map-figma.rxDnTC5X_Z1gus9b.webp How to Make a Topographic Map in Figma https://www.topolines.app/blog/topolines-2-0 2026-10-04 monthly 0.6 https://www.topolines.app/_astro/cover-topolines-2-0.JDih2HIv_27Nggh.jpeg TopoLines 2.0: two readings of one terrain TopoLines 2.0 adds Points, a second way to draw elevation next to contour lines, plus scale bars, legends and 5 m lidar for five more countries. https://www.topolines.app/_astro/cover-topolines-2-0.JDih2HIv_Z1HxrLx.webp TopoLines 2.0: two readings of one terrain https://www.topolines.app/blog/topolines-2-0/two-readings.webp One terrain drawn half as gradient contour lines and half as a field of gradient dots https://www.topolines.app/blog/topolines-2-0/ui-lines.webp The TopoLines editor over the Mont Blanc massif, 81 km² zone drawn as white contour lines, Render switch set to Lines https://www.topolines.app/blog/topolines-2-0/ui-points.webp The same Mont Blanc zone in the editor with the Render switch set to Points: the panel shows density, shape, size and placement controls https://www.topolines.app/blog/topolines-2-0/points-gradient.webp Points export near Salt Lake City: dots grow from small green ones on the valley floor to large pink ones on the mountain slopes https://www.topolines.app/blog/topolines-2-0/depressions.webp Volcanic crater drawn in light blue contours with labelled elevations; the crater rings are marked with orange inward-pointing hachures https://www.topolines.app/blog/topolines-2-0/geiranger-labels.webp Geirangerfjord drawn in teal and blue contours with elevation labels set inside the lines https://www.topolines.app/points/also/sheet.webp Points export in black on white with a margin band: a 2 km scale bar, a legend from 831 m to 3,540 m, and a north arrow https://www.topolines.app/blog/topolines-2-0/elevation-ramp.webp Contour lines coloured by elevation, from deep blue in the valleys to white on the summits https://www.topolines.app/blog/topolines-2-0/lidar-30m.webp Lauterbrunnen valley traced from the 30 m worldwide model: soft, rounded contours and a false depression on the valley floor https://www.topolines.app/blog/topolines-2-0/lidar-5m.webp The same Lauterbrunnen zone traced from swissALTI3D 5 m lidar: the cliff bands are sharp and the valley floor is flat https://www.topolines.app/blog/topolines-2-0/svg-in-figma.webp A TopoLines SVG opened in Figma, with separate layers for contour-labels, annotations and contours https://www.topolines.app/blog/whats-new-september-2026 2026-09-18 monthly 0.6 https://www.topolines.app/_astro/cover-whats-new-september-2026.DSew3W8o_1HEDO8.jpeg What's new in TopoLines — September 2026 A big update: DXF and GeoJSON exports, bare-earth GEDTM30 elevation, national 5–10 m data, your own DEM uploads and a redesigned editor. https://www.topolines.app/_astro/cover-whats-new-september-2026.DSew3W8o_23DmdB.webp What's new in TopoLines — September 2026 https://www.topolines.app/blog/hd-fallback-gedtm30 2026-11-05 monthly 0.6 https://www.topolines.app/_astro/cover-hd-fallback-gedtm30.CQlDpIT2_2mhzUP.jpeg Why HD now falls back to GEDTM30, not "10 m" tiles We checked the worldwide "10 m" source behind HD against national lidar at nine sites. The free 30 m GEDTM30 was closer at eight, so HD now falls back to it. https://www.topolines.app/_astro/cover-hd-fallback-gedtm30.CQlDpIT2_Z1jkbEx.webp Why HD now falls back to GEDTM30, not "10 m" tiles https://www.topolines.app/blog/hd-fallback-gedtm30/rmse-by-site.webp Bar chart of error against lidar at nine sites. AWS Terrain Tiles are off by 9 to 113 m at eight sites, GEDTM30 by 4 to 13 m; only at Innsbruck is AWS closer, 2.6 m against 5.9 m https://www.topolines.app/blog/hd-fallback-gedtm30/profile-verdon.webp Elevation profile across the Gorges du Verdon: lidar and GEDTM30 drop together to the river near 580 m, while the AWS line stays between about 890 and 1,190 m https://www.topolines.app/blog/hd-fallback-gedtm30/overlay-verdon.webp Contour lines of the Gorges du Verdon drawn three times at a 20 m interval: lidar in blue, GEDTM30 in black lying on it, AWS in red, which misses the gorge on the right https://www.topolines.app/blog/contour-interval 2026-11-06 monthly 0.6 https://www.topolines.app/_astro/cover-contour-interval.DbHoyCB9_Z2qDNpl.jpeg What Is a Contour Interval? How to Find & Calculate It What a contour interval is, how to find it on any topographic map, the formula to calculate it from index contours, worked examples, and what index contours are. https://www.topolines.app/_astro/cover-contour-interval.DbHoyCB9_1PT1j6.webp What Is a Contour Interval? How to Find & Calculate It https://www.topolines.app/blog/diagrams/contour-interval.webp Diagram of a hill drawn with contour lines: thick index contours labelled 500 ft and 600 ft, four thinner lines between them, five numbered spaces along an orange line, and the calculation 600 minus 500 equals 100 feet, divided by 5 spaces equals a 20 foot contour interval. A point P two lines above the 600 ft index contour is at 640 ft https://www.topolines.app/contour-lines/lines/interval-10.webp The Chamonix valley and Mont Blanc massif drawn with a 10 metre contour interval — dense lines that capture every small bump in the terrain https://www.topolines.app/contour-lines/lines/interval-100.webp The same Chamonix area drawn with a 100 metre contour interval — far fewer lines, only the big landforms remain