The OffWind Elevation is a code for generating terrain data in the STL format[0]. The elevation data is fetched from the Google Elevation API[1].

The code is written in C# using Visual Studio 2010 and should compile "out of the box".

The software is executed as a command line tool taking the following arguments:

--dms-latitude DD:MM:SSSS WGS84 latitude[2] --dms-longitude DD:MM:SSSS WGS84 longitude --num-cells-I Number of I-cells in a IxJ grid to be generated --num-cells-J Number of J-cells in a IxJ grid to be generated --distance-ew Distance (in meters) from east to west --distance-ns Distance (in meters) from north to south --output Output filename (in STL format)

Example:

elevation --dms-latitude 61:53:37.20 --dms-longitude 9:51:43.92 --num-cells-I 10 --num-cells-J 10 --distance-ew 2000.0 --distance-ns 2000.0 --output rondane.stl

Please take note of the Usage Limits of the Google Elevation API. The current implementaion of the OffWind Elevation does not handle grids larger than 10x10 cells well - although this could easily be extended by sending multiple requests to the Google service. As of this writing there is a limit of 2,500 requests per day, and no more than 25,000 locations total per day.

The DMS latitude is limited to the northern hemisphere.

[0] http://en.wikipedia.org/wiki/STL_(file_format) [1] https://developers.google.com/maps/documentation/elevation/ [2] http://en.wikipedia.org/wiki/World_Geodetic_System