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Hi, one simple way is using voronoi polygons if you have arcmap installed, this is the procedure : open Arctoolbox > Analysis Tools > Proximity > Creating Thiessen Polygons set your points as Input Features - dont forget to set Output Fields to ALL now, u have voronoi polygons for each point, next step is dissolving the little polygons to big one according to, A,B,C,D,... Arctoolbox > Data Management Tools > Genralization > Dissolve set voronoi polygon from last step for Input Features - this one is important : Dissolve Field> select field which is contains A,B,C, .... * if you dont have it, you must create it from A1,A,2,...B1, B2,.... before going into dissolve, create a new field and calculate it with Left(values,1), this new field and the calculate formula extracts the first left letter. it will extract A from Ai good luck

Urban Network Analysis: A Toolbox for ArcGIS 10 The City Form Lab has released a state-of-the-art toolbox for urban network analysis. As the first of its kind, this ArcGIS toolbox can be used to compute five types of graph analysis measures on spatial networks: Reach; Gravity; Betweenness; Closeness; and Straightness. Redundancy Tools that come with the software, additionally calculate the Redundancy Index, Redundant Paths, and the Wayfinding Index. DOWNLOAD : version 1.01 https://bitbucket.org/cityformlab/urban-network-analysis-toolbox/downloads/Urban%20Network%20Analysis%20Toolbox%201.01.zip