National Map Viewer
From charlesreid1
Shapefiles
Getting Shapefile Data
To download elevation data in shapefile format:
Zoom into the area you want
Check "US Topo" and click Find Products
Next to each item, there are four links - the third one is "Download"
Download the shapefile data and unzip it
Shapefiles to GeoJSON
We'll convert these shapefiles to something better for the web: GeoJSON
See http://ben.balter.com/2013/06/26/how-to-convert-shapefiles-to-geojson-for-use-on-github/
Install homebrew, then:
brew install gdal
This will install a utility called ogr2ogr, which we'll use to convert shapefiles to GeoJSON files.