WorldBiG

Calculation with WorldBiG grid density selection (side square from 64 km to 1/1024 km)

The *.xlsx file contains columns: Group, Latitude, Longitude and possibly Value (absence [Group] recalculates the area itself).
When the loaded file contains a Value column, then WorldBiG always uses its data for calculations:

Enter the latitude and longitude (in degrees) of the nearest point for the area under study.
This point will be the central point of the grid with a maximum span of 1024 × 1024 km.

Latitude: Longitude : The programme will generate a grid best suited locally to the Earth's surface for a variable R-radius.
If you do not select the variable R, the average for the Earth is R=6371 km (slightly inaccurate, but according to Google Earth calculations).

Variable R-radius Side of the square