Patent ID: 7576754
Filing Date: 2009-08-18
Classification: G01C,G09B,H04L,H04W

Abstract:
1. A computer-implemented method of identifying boundaries of a geographic area comprising a city, the method comprising: (a) identifying coordinates of multiple cities; (b) associating with each city a grid of cells of geographic data encompassing the city's coordinates; (c) for each cell associated with a city, identifying a larger replacement cell of geographic data encompassing the cell; (d) testing for intersection between replacement cells of cells of different cities; (e) for each cell whose replacement cell does not intersect another replacement cell of another cell of another city, replacing the cell with the replacement cell and associating the replacement cell with the city; (f) repeating (c)-(e) to replace replacement cells with further replacement cells until: (g) using said replacement cells to define a boundary of the geographic area; wherein the method is implemented in a computer system that comprises a process and a memory.