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.
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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.
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.