Project goals:

• Enable download of specific elevation data ranges
• Create lossless heightmap files

Features:

• Raw elevation data is stored in csv accumulator files

• CSV can be converted to 1 channel * 16bit PNG (you can convert those to RAW by yourself if needed)

• Program uses Http Get or Post methods to communicate.

• You can use https://github.com/andrew-raphael-lukasik/pngcs to import those 16bit png as Texture2D

• Implemented data providers:

  • api.open-elevation.com/api/ (default)

  • maps.googleapis.com/maps/api/elevation/ (requires key)

• IElevationServiceProvider makes adding new data providers easy

Workflow:

1. Specify latitude/longitude rect (fields)

2. Specify resolution (fields)

3. Specify "Max Coordinates Per Request" (field)

4. Hit Start (button) and specify csv file name

5. Now wait^2. Depending on rect and resolution this process will take anywhere from minutes to many hours

   pro tip: let it run while you sleep or on another machine/unity instance

6. This process can be Aborted (button) and started over again when targeting the same csv file (dialog window will show up)

7. Occasional connection or time-out errors are to be expected. But 100% constant errors needs your attention - when that happens try lowering Max coordinates per request by half and repeat (this limit depends on data provider, server load etc. and can vary a lot for different providers).