CryEngine 3 SDK Full Tutorial List:
http://www.worldofleveldesign.com/categories/cat_cryengine_3_sdk.php
In this tutorial we cover how to export/import/create custom heightmaps using Photoshop.
Topics covered:
-Export heightmap
-Import heightmap
-Create custom heightmap using Photoshop and default filters
-Modifying and tweaking custom heightmap
source