I need to sort database rows according to GPS coordinates (or any other geographical representation). The way I've understood it, MySQL Spatial Indexes are too buggy at the time of writing (at least ...
While working with PostGIS pgrouting, for calculating the distance between two roads (lines) I'm using the shortest_path function. The logic is based on start_point(Start_id) and end_point(end_id) ...
I am trying to create a spatially enabled PostGIS database. I am following the PostGIS documentation, http://postgis.refractions.net/documentation/manual-1.5/ch02.html#id2648455. In the short ...