Suppose you have a set of lat/lon points, where do you find out their elevation?
Simple, let say you have the following coordinates (a cross in concrete on the top of the hill in front of my parents' place):
45.469678, 10.970527 (I got these from 'Get Directions from here' in google maps)
Then call the relevant USGS' web service
getElevation for Latitude 45.46 --> Y_Value=45.469678 for Longitude 10.97 --> X_Value=10.970527 return result in meters --> Elevation_Units=METERS use the best survey available --> Source_Layer=-1 not other additional info --> Elevation_Only=true
Why would you want elevations?
To plot an elevation chart of a bike or hiking tour.
Amazing what you can find around…
(This was inspired by https://econym.org.uk/gmap/altitude.htm)