Use this to generate terrain to put on your SD card. The generated terrain is based on the SRTM data and has 100m horizontal resolution. It covers all areas between 0 and 60 degrees North/South latitude.
Multiple generated files can be combined on the SD card.
Compatible with Ardupilot Plane 4.0.6+ and Copter 4.0.4+
Note that ArduPilot 4.0.x and 4.1.x use different terrain file formats.
To download entire continents of terrain data, see here for ArduPilot 4.0.x or here for ArduPilot 4.1.x.