I need to recreate a landscape in 3D or real World areas by using WebGL technology. The typical area I need to get height map for is about 1km x 1km and resolution should be as much accurate as possible. Approach I'm thinking to follow is:
- Get the elevation map of the area I need in greyscale png format (or any other image formats) by providing center point lat, log
- Covert each image point into x,y,z coordinates
- Create and display my terrain 3D mesh
I'm OK with steps 2 and 3, but I don't know a service/API to query that can return such image height map with a suitable resolution. I've looked at the Google API but it returns json/xml format info along a path not a square area. Can you suggest any?