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 Armure Rivers, water sheds and water sources.
averyEnlightened
How can I create a map for arable lands?
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John Wick
I have tested SAR data for estimating soil moisture content and was successfully, but there is a limitation in data availability. Whereas, Landsat 8 is widely available for free. I completely agree that calibration is very important for accurate estimation.
avery
It’s very difficult to calculate soil moisture from the reflectance image, there are now companions passive and active sensor that given an estimate of moisture, ESACCI-SSMV data for example.
But what you can do from the Landsat images is to estimate the moisture in the vegetation.
Andrew Pel
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.