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Surface water body data like Lakes, Ponds, Reservoirs, Rivers are important geospatial data for many purposes. This kind of data can be obtained in many ways. They can come from field measurements, GPS-based measurements, or derived from Aerial Photographs or Satellite Imagery. Deriving surface water features from aerial photographs or satellite imagery, in particular, has some strength compared to more conventional mapping methods. Aerial Photographs or Satellite Imagery recording the surface water body in a synoptic way. It s is basically just like the real features that we saw in the field. It is also efficient and time-saving. You can get the data either in vector format or raster format depends on your preferred extraction methods.  Particularly for satellite imagery, these data could come from a wide range of imaging sensors operates in different electromagnetic spectrum (from optical spectrum to radar/microwave spectrum). Different spectrums will expose different characteris...