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To build the 3D model that can be properly rendered, further steps are necessary to surface generate surface from the contours. To change the projection, go to Tools-Configure… (Detailed instruction is available here: …) Open Global Mapper – select Open Your Own Data Files – choose your dwg fileįor undefined dwg files, an “Unknown Projection” window will show up and you can click on “OK” and then select the projection. Instruction of project CAD (dwg) files in ArcGIS is available here: Īlternatively, to define projection for CAD (dwg) files in Global Mapper: If the projection and unit are inconsistent, the dwg file needs to be projected in ArcGIS or Global Mapper. To check the projection and units in AutoCAD, type command PR to see X, Y and Z values of any selected contour, and command UNITS to check the unit of the current file. However, if the projection and units are not defined correctly, the contours can be displayed incorrectly. This file can be opened in AutoCAD and AutoCAD Civil 3D directly, with elevations shown in a 3D view (For example, change the setting in View- Views- SW Isometric). If a dwg file of contours (with elevation information) is prepared: If a dwg file of contour lines is not readily available, you can generate the dwg file from: Related software:ĪrcGIS/ ArcScene Global Mapper AutoCAD/ Civil 3D Sketchup Rhino Please contact the library for more details. Note: An alternative way to obtain DEM data worldwide is using Global Mapper with its online source or the GEBCO (Bathymetry) data set available at the Map and Data library. The Netherlands 10m interval contour map:ĭigital Elevation Model (DEM) of Australia derived from LiDAR 5 Metre Grid UK 50 Meter interval contour map: OS Terrain 50įrance 1m to 5m interval contour map (need to sign-in): Worldwide 25 Meter interval contour map: OpenDEM ( ) OR Canadian Digital Elevation Model (DEM) Brief introductions on the pros and cons of each option are provided.
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This document compiles online resources that help to build terrain 3D models with a variety of software-options.