Download .dem terrain files

If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U. Government Work. Visit page. Open With Toggle dropdown Data. Use Constraints: There is no guarantee or warranty concerning the accuracy of the data. Users should be aware that temporal changes may have occurred since these data were collected and that some parts of these data may no longer represent actual surface conditions.

Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data.

Any user who modifies the data is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the USGS.

Merge multiple terrain files. This step is only necessary if you downloaded more than one terrain data set two in this example. A projected CRS should be selected. You can change the units in the raster projection to feet if desired. In Project Raster Data Management tool:. Select the saved projection as the ' Output Coordinate System ' from Favorites.

Set the vertical units to feet if you converted the terrain raster elevations to feet. Click the Save Current Project button. If the Basin Model does not have a defined coordinate system, a popup menu will be shown. In render type dropdown select singleband pseudocolor and click classify. Now we will extract contours from this image. You may also be interested in QGIS tutorial. Now you can easily analyze the surface by seeing the contour map.

Hope this tutorials helped you. If you want to share some suggestion or want to ask some question do comment below. IMG file, newer version that is georeferenced and the older. I would like to overlay in GE, Can you help? Interesting read and very helpful. The only issue i had was i cant get the psuedocolour range to work as the map disappears after changing the style and so cant create the contour map.