In principle, you have to start the session. Using AutoCAD, having the Plex.Earth Add-ins installed. Display the area where we want to obtain the Google Earth digital model. The download of this contour can be done from AutoCAD, obtaining points from a grid and generating a terrain model with its curves. The vertical error is estimated to be 16 meters. The horizontal resolution is 90 meters (it varies with latitude) and based on this curve the rest was interpolated (It is assumed that in the United States it goes through 30 meters but it is useless to us). This functionality is visual in Google Maps, in Google Earth at the digital model level. The source of this contour line that Google has integrated is the digital terrain model initially developed by NASA and continued by the USGS, which is known as SRTM-90m. This is activated in the left panel “Relief” and in the floating button you can activate or deactivate the view of curves. Google Maps added the highlight option to the map display, which includes contour lines from a certain zoom level.
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