If you want to create your own Landcover lcv files, you should take a sample .lcv tile from the SRTM and Landcover download site in USA for Radio Mobile: http://rmw.recordist.com/. Or see 'How to > Obtain Geodata > Land Cover (USA)'.

A .lcv tile contains a matrix of 3601x3601 bytes, aligned the same way as the data in a SRTM tile.
You must translate your data into the following types:

0 WATER
1 EVERGREEN NEEDLELEAF FOREST
2 EVERGREEN BROADLEAF FOREST
3 DECIDUOUS NEEDLELEAF FOREST
4 DECIDUOUS BROADLEAF FOREST
5 MIXED FOREST
6 WOODLAND
7 WOODED GRASSLAND
8 CLOSED SHRUBLAND
9 OPEN SHRUBLAND
10 GRASSLAND
11 CROPLAND
12 BARE GROUND
13 URBAN AND BUILT-UP
15 No data