Where can I get the x, y, z -coordinates for California to use a contour plot?

Question

I would like to make California's map by the contour plot. However, I do not know how to get the necessary x, y and z -coordinates.

Answer 1

Have you consulted the California's Geospatial Information Office? There's also geodata.gov, which links to a bunch of elevation datasets, including the USGS National Elevation Dataset.