You can select an area of interest on the map to see resolutions in that area. You can zoom in and out by using +/- controls. You can select map tiles by clicking on Layers icon. OSM, Google, and Google Satellite view. Use icons below to draw on map. You can draw Polygons, Squares, Circles, or set Points. You can adjust radius around your point in top navigation menu. Or simply enter the address on top. Same radius technic will apply. If you are unhappy with your geometric shape, simple click on Trash icon below and select Clear All. You can save results in CSV format, view GeoJson, and save your geometric shape for future use. See Show Me for visual examples.
