# Land cover change - need help with land cover classes

I'm very much new to using ArcGIS and to this forum. For my thesis, I have a raster map of Indonesia where I only look at three types of land cover retrieved from the ESA-CCI dataset. These involve: croplands, forest and grassland. I merged several land cover classes representing "croplands" as one value, the same I did for forest. In other words, I basically reclassified my land cover classes.

However, some land cover classes within "croplands" involve mosaic classes, where I had to assume my own cropland fraction (%). For example, for Mosaic cropland (>50%)/natural vegetation (tree,shrub,herbaceous cover)(<50%), I assume a cropland fraction of 60% and 40% respectively.

How do I set this fraction in my map?

Since the overall objective is to quantify how much forests has been converted (100%, one entire pixel basically) into croplands and grassland in a given year.

• With a thematic raster, I don't know if you can. You might just have to work the mosaic class into your calculations. Calculate area change in your mixed class, then multiply the value by .4 or .6 or whatever. – JoshC May 11 '18 at 12:48