Console command to export the terrain heightmap?

[Prometheus]

This is regardign TGEA.  I know we can export it from the terrain editor, but I'd prefer the grayscale version if possible.  I know there's a command for it because I used it yeas ago, but have since forgotten it. 

Thanks.

[Prometheus]

Whelp, answered my own question.  To future warriors:
 

6480.exportHeightMap("terrain_heightmap.png");

6480 is the ObjectID:

It should then save in the main directory where game.exe resides.