BackgroundGeographical movement is of crucial importance. This is because much change in the world is due to movement: the movement of people, ideas, money, or material. One way of depicting and analyzing geographical movement is by way of geographical maps. A convenient and rapid method of displaying movement data on such maps is, therefore, very useful. A flow mapping program is one approach to this objective. For in depth information see: About Flow MapperIn 2003 CSISS supported an effort to produce an interactive flow mapping program. The result is an updated Windows-based version of a program originally designed and programmed by Waldo Tobler in 1987. Tobler’s original application was updated by David Jones using Microsoft Visual Basic .Net and SVG (Scaleable Vector Graphics) for map rendering. It requires as input locational coordinates and a table of interaction between places. Additional input may include place names for the location coordinates and a file of boundary coordinates (the background map). The user has several menu options for producing a map. The program allows for the production of a total movement map shown by volume-scaled bands, net movement given by scaled arrows, or simultaneous two-way moves. Flow Mapper Functionality in ArcGIS Flow Data Model Tools consist of several ArcGIS 9.x VBA macros. The prototype software integrates the functionality of Flow Mapper into ArcGIS, and allows ArcGIS interaction with the Flow Data Model. Source code and further information. Source.

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