I sampled river depth at scattered positions and I want to be able to make a map and GIS layers out of it.
My problems are:
As the river meanders the interpolation I do in scientific packages i,e. matlab generates values in points where there is no river therefore when I create a KML file out of it, it covers land areas. Does QGIS/GRASS have a better solution for that?
My GPS points accuracy of ~3m 90% of the time. Do I need to do any filtering for location?