Dobré ráno všem.<\/SPAN><\/P>Jaká bude nejlepší metoda pro výpočet z DEM a shapefile s polygonami obcí celkové plochy každé obce, která je pod úrovní moře, prosím?<\/SPAN><\/P>Předem děkuji za vaši pomoc!<\/SPAN><\/P><\/BODY><\/HTML>
1- raster calculator (in Spatial Analyst Tools/Map Algebra) with [original DEM] <= 0 which produce a new raster with two categories, one above sea level and another below sea level
2- Tabulate area (in Spatial Analyst Tools/Surface/Zonal/) which calculate the surface of each previous categories within the polygons of the shapefile.
3- in the table created, create a new field for the total surface of the two categories.
4- in the same table, create a new field for the percentage of submerged land with surface of submerged land / total surface. Click on properties on the percent field, then click percentage, then Numeric, then all frequencies are percentage, adjust the number of decimals.
5-Spatial join the table to the original table of the shapefiles of the communes. End
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