My district contains water towers (land with elevation above 1400m, a.s.l) and arable lands suitable for crop production (land of 1000 to 1400m a.s.l). Arable lands have easily erodible volcanic soils; therefore arable lands with steep slopes (30-60%) require terraces to be farmed and moderately steep slopes (15-30%) require contour farming. Given the district area DEM and landsat satellite image: (a) I want to create a map that shows Arumeru Rivers, water sheds and water sources.
You can generate the surface model showing the elevation. Overlay with digital GIS layers of water bodies including, river, ponds and lakes. For the area demarcation regarding arable land you may choose to prepare the slope map and slope direction. An overlay map can be generated to find the suitable arable map, deducting the slopes not suitable for cultivation. Use overlay techniques and query tools to work on the raster maps. If you are using ArcGIS this would be feasible.
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