New answers tagged

0

You want to find the three intersection points of three pairs of great circles given a point and a bearing. Formulae for great circle intersections are given here: http://www.movable-type.co.uk/scripts/latlong.html There's a javascript widget there for testing, and code which you will have to convert to your unstated programming language of choice. There'...


4

If you're happy with the characteristics of your projection, you should just use ST_Distance(geometry, geometry). In your example you seem to be in UTM, which is a pretty good projection, so why not? It's much much less CPU intensive than the geodetic functions ST_Distance(geography, geography). (Note that ST_Distance_Spheroid() just calls into the same ...


0

Deduce what is not visible. Suppose you stand at a vertex on the beach, looking at two remote vertices of a neighboring polygon. Then you can assume that any vertex in the whole sector behind these vertices is invisible from this vertex.



Top 50 recent answers are included