Am Thursday 21 May 2009 schrieb Radomir Cernoch: > Guenther Meyer píše v Čt 21. 05. 2009 v 09:02 +0200: > > yes - if you can make use of a database with geospatial extension like > > postgis. there you have functions to find out easily if a point or a line > > (which streets are) lies inside a given polygon. > > I you don't have those functions, I don't know if this is possible. > > It may be, but this would be a very complex thing... > > Thank you for your explanation. Would it be then possible to ask > questions like: "Is the point at (x,y) inside any polygon, which > has tag 'z'?" Or even something like a "JOIN" of the point itself with > the polygon: "Give me all points in bbox (a,b,c,d) and the value of > 'zone:xxx' of an encompassing polygon, if they lie in some"? > with or without gis functions? with those functions this all is possible. without, searching for points inside a bbox or circle is relatively easy, finding a point inside a polygon is maybe also doable with some more effort.
> Sorry for many questions, but I do not want to promote an idea without > knowing that it's feasible... > I'm not a gis expert, maybe here are people who know this better... what is your idea?
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