This week I downloaded an ASTER Digital Elevation Model (DEM) (30 m res) from Earth Explorer to use in my classification of Landcover. My plan is to separate different types of landcover by looking at slope and elevation. I have about 250 ground truth points where I know the landcover, and by grouping the landcover classes and looking at the elevation and slope statistics of each class, I might be able to find a way to automatically separate between wheat and barley fields, orchards and shrubland or woodland. During my field work I noticed that woodland and shrubland often occured at high elevations, while cereal agriculture were found at lower elevations with little slope. Orchards are usually found a bit higher up, but shouldn’t be on too steep slopes to facilitate harvest.
Here is a map I compiled with the slope data: