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This function is the same as IsoPoly, except the MBR parameter is replaced with a buffer parameter.
Internally the function automatically calculates MBR from the items in NL and LL, MaxCost and buffer. This makes it much faster and the recommended solution for preparing input for drive time polygons.
Buffer should be specified in km. Suggested values are 2 km for urban areas and 10 - 20 km in rural areas (for voronoi calculations).
If you use the output for Alpha shapes, then buffer = 0 is sufficient.