| Version Number | Release Date | Layers | Description / Comments |
| Version 2 | Jan 2013 | 6 | No vegetation filtering, fixed peak width (first published version) |
| Version 3 | Mar 2013 | 7 | Vegetation filtering, fixed peak width Added ground fraction layer |
| Version 4 | Jul 2013 | 8 | Vegetation filtering, variable peak width Added peak widening layer |