Andrea Aime schrieb: > Jürgen Jacob ha scritto: >> Dear all, >> >> is it possible to buffer Points into Polygons? I've a shapefile with >> point features and I want to create a buffer around them. How can I do >> this? The CRS is WGS84 and the buffer should be 50m. The resultung >> geometry objects will be polygon, or? > > JTS provides a buffer operation, but that works only in cartesian space, > it won't help you in your specific case. > I see two practical solutions to your problem: > - if the points are located in a limited area, reproject them to > a metric projection that has low deformation over the area > of interest (utm, lambert, whatever), do the buffers with JTS, > reproject the polygons you get back to WGS84. > This approach works with every kind of geometry > - if the points are located in a large area, use GeodeticCalculator > to create the buffers manually. Set the starting point at one of > the point that needs buffering, and ask for the coordinates of > a point 50m away, with an azimut of 0. Then use an azimuth or > 30, 60, 90 and so on, connect the resulting point, and there > you have the shell of the buffer polygon. Repeat for all points > and you're done. > > Hope this helps > Cheers > Andrea
Thanks a lot!! I'll check what will be the best solution for my application. How do I reproject geometries? Cheers, Jürgen ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Geotools-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-devel
