Transform Coordinates with TdhGIS

May 28, 2012 -- TdhGIS can now transform coordinates using the powerful and versatile Proj4 library. The ability to project longitude/latitude data to cartesian coordinates makes TdhGIS a legitimately featured GIS solution for a wide range of applications using widely available data. Spatial analysis capabilities include:

  • Color polygons based on user data values using either Discrete intervals or Gradients.

  • Allocate point data to user specified BUFFERS for points, polygons and multilines (e.g. find all gas stations within 1 mile of a highway).

  • Allocate point data to polygons. (e.g. assign structures to hydrological basins).

  • Allocate polygon data to other polygons. (e.g. allocate population data by census block to political boundaries).

  • Create thiessen polygons (e.g. for all hospitals within a state, define the areas where a particular hospital is closer than any other).

  • Create data contours (e.g. create lines of equal ground elevation based on a set of elevation points).

  • Create contour polygons (e.g. define the area where average rainfall exceeds a selected value based on weather station data).

TdhGIS for MSWindows and Linux can be used free of charge and downloaded from tdhgis.com. 



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