Greetings, I would like to bring to your attention some free software for vector based spatial analysis. TdhGIS runs under both Linux and MS Win and performs the following functions:
- 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) - Allocates point data to polygons. (e.g. assigning structures to hydrological basins). - Allocates polygon data to other polygons. (e.g. allocating population data by census block to political boundaries). - Creates thiessen polygons (e.g. for all hospitals within a state, define the areas where a particular hospital is closer than any other). - Created data contours (e.g. create lines of equal ground elevation based on a set of elevation points). - Creates contour polygons (e.g. define the area where average rainfall exceeds a selected value based on weather station data). For complete information, please visit the TdhGIS.com website and download the software and user's manual. There is no charge for the use of this software. If you have any questions, please contact me. Tim Hirrel
