The script/program that inserts the points needs to check for the distance from such features. How you do this is very much up to you. Custom Postgis functions & Postgres triggers, or entirely in your script.
This process is pretty simple, but the code wrapped around it to implement a useful application will be more complex. The basic process will be much the same however you implement it: (I'm assuming that you are recording the points, not just checking them, and have an active layer in mapserver which displays the points or features which are identified when the point gets within range) Insert point into table Check if any required features are closer than your minimum distance from the point Set a flag or insert a record in the database which will be picked up by the mapserver layer to display these. Do anything else you need in such cases Insert next point & repeat (Also: create a process for removing such flags or records when they are no longer needed) > Hello, I'm trying to develop an application that takes > points input from a GPS ... And I would like to realize when > those points enter at certain points .. Suppose a state or > cities... I'm working with Mapserver and PostGIS .. > Someone can give me an idea of how to accomplish this? _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
