Re: [postgis-users] Using Postgis raster for water elevation
Hey, Map Algebra? (custom function with a thresholding?) Cheers, Rémi-C 2015-05-27 14:57 GMT+02:00 Gabriel Vatin gabriel.va...@kinaxia.fr: Hello all, I'd like to have some feedbacks on an operation that should be possible with Postgis raster, but I can't find out how to do this. I have a whole raster of French DEM (elevation data) stored on PostGis, with tiled objects. That makes a table with some 14.000 rows of data: france_mnt (rid, rast, filename) With ST_Value(france_mnt.rast, geometry), I can retrieve the elevation of a given coordinates in the geometry object. I'd like to create a new raster, on the fly, with a maximum value of elevation, such as : all pixels with value 10 This could be used for mapping water elevation in a area, for instance. Anyone has already done this? I'll be happy to have some tips on the function to use. Thanks! Gabriel ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
[postgis-users] Using Postgis raster for water elevation
Hello all, I'd like to have some feedbacks on an operation that should be possible with Postgis raster, but I can't find out how to do this. I have a whole raster of French DEM (elevation data) stored on PostGis, with tiled objects. That makes a table with some 14.000 rows of data: france_mnt (rid, rast, filename) With ST_Value(france_mnt.rast, geometry), I can retrieve the elevation of a given coordinates in the geometry object. I'd like to create a new raster, on the fly, with a maximum value of elevation, such as : all pixels with value 10 This could be used for mapping water elevation in a area, for instance. Anyone has already done this? I'll be happy to have some tips on the function to use. Thanks! Gabriel ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
Re: [postgis-users] Using Postgis raster for water elevation
Or ST_Reclass() reclassifying everything 10 to nodata... -Original Message- From: postgis-users-boun...@lists.osgeo.org [mailto:postgis-users- boun...@lists.osgeo.org] On Behalf Of Rémi Cura Sent: Wednesday, May 27, 2015 9:31 AM To: PostGIS Users Discussion Subject: Re: [postgis-users] Using Postgis raster for water elevation Hey, Map Algebra? (custom function with a thresholding?) Cheers, Rémi-C 2015-05-27 14:57 GMT+02:00 Gabriel Vatin gabriel.va...@kinaxia.fr: Hello all, I'd like to have some feedbacks on an operation that should be possible with Postgis raster, but I can't find out how to do this. I have a whole raster of French DEM (elevation data) stored on PostGis, with tiled objects. That makes a table with some 14.000 rows of data: france_mnt (rid, rast, filename) With ST_Value(france_mnt.rast, geometry), I can retrieve the elevation of a given coordinates in the geometry object. I'd like to create a new raster, on the fly, with a maximum value of elevation, such as : all pixels with value 10 This could be used for mapping water elevation in a area, for instance. Anyone has already done this? I'll be happy to have some tips on the function to use. Thanks! Gabriel ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
