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 -- Andrea Aime OpenGeo - http://opengeo.org Expert service straight from the developers. ------------------------------------------------------------------------- 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
