I need to calculate the share of the area within a 50km radius of major German city centers that is covered by water with either Arcmap 10.3.1 or Qgis 2.14. My plan is to use the Global Lakes and Wetlands Database as a source , but if there is a dataset publicly available with higher resolution which would also include all the rivers I am very open to a recommendation.
I have already created a shapefile that represents the area of interest around each city in an EPSG:3035 projection. How can I now calculate the share of the area within each polygon covered by water? I have already tried to follow these instructions How to calculate a percentage of an area covered by polygons ArcGIS 10.1 but the intersect tool does not show any results while the tabulate intersect tool shows errors. What would be the suitable approach for this task?