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While there are a bunch of reasons you might want DEM files, if you just want elevation data for the points, you don't have to download the DEM files. Instead, you could use the python geocoder [1] library to grab the elevation of your points. Reading the shapefile directly is pretty easy, but with simple point files, I often find it easier to use CSV using ogr2ogr [2]. As a quick test, I converted a small subset of points in SHP to CSV and used this script [3] to add the elevation (meters) to each point.

[1] https://github.com/DenisCarriere/geocoder

[2] ogr2ogr -f CSV campsites.csv campsites.shp -lco GEOMETRY=AS_XY

[3] https://gist.github.com/dc46e33eb19ac67e0ecf

On Wednesday, April 15, 2015 10:51 AM, Anam Khan <[log in to unmask]> wrote:

Hello all,

I am working on a GIS project to map campsites found in a wilderness area. I'm working with the Forest Service and their inventory data for campsites.

I have three feature classes:

campsites.shp: point data for campsites found in the wilderness

SystemTrails.shp: official Forest Service trails in the wilderness

hydro.shp: line data that shows all the streams in the wilderness

I have two questions:

1. Does anyone know how I can download free DEM data for a certain location from USGS?

2. If I have contour elevation data that I can get from the DEM, is there a way to extract the elevation that a certain campsite falls on and add that elevation to the attribute table of campsites.shp for that specific campsite?

Thanks,

Anam Khan

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