https://developers.google.com/maps/documentation/elevation/usage-and-billing?ref=blog.afi.io
Elevation API Usage and Billing | Google for Developers
usage and billingelevation apigoogledevelopers
https://developers.google.com/maps/documentation/elevation/overview?authuser=2
Elevation API overview | Google for Developers
Get elevation data for all locations on the earth's surface. Learn about how to customize your output and read response codes.
elevation apioverviewgoogledevelopers
https://cteco.uconn.edu/ctraster/rest/services/elevation/Hillshade/ImageServer?f=jsapi
ArcGIS API for JavaScript: elevation/Hillshade
for javascriptarcgisapielevation