[GIS] Reading elevation data from WMS response

Question

I am trying to get elevation data from the tile received from USGS server.

I query the data using Image Format image/Png. When I read the data I get color values.
I need to know how to read the elevation values from it.

Is there any documentation or sample available?

Answer 1

WMS returns an image of your data, if you want to use it as data then you need a WCS.