On 1/12/2016 3:17 AM, Andrea Aime wrote:
On Tue, Jan 12, 2016 at 3:52 AM, Clifford Snow <cliff...@snowandsnow.us <mailto:cliff...@snowandsnow.us>> wrote:I'm looking for code to suggest to QGIS developers to use. Right now QGIS doesn't recognize Washington State Plane North/South. And besides, I'm curious how it's accomplished. Doing it by hand resulted in me picking the wrong match! I wrote the first version of site several years ago, it's a simple application of the GeoTools referencing subsystem, backed by the EPSG database. Not sure how it works today, but I can tell you how it used to work back then. When you paste a PRJ, first it parses it and tries to perform a match against the official EPSG database, by first making an indexed search by projection name and a few other params, falling on a brute force scan and compare if the first does not match. If not even that works, then it has a secondary Lucene index with all projections WKTs stored inside, and it will do a text based search against it, hoping to find something similar (aka "shot in the dark"). Hope this helps Cheers Andrea
This: http://www.gdal.org/classOGRSpatialReference.html#af1a29550373c2c14bd11514641e58e7c converts from proj4, perhaps the code could be somehow reversed? -Andy _______________________________________________ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/postgis-users
