[GRASS-user] Raster with bounding box
Hi all, I have a bunch of png format images to import. I also have a csv of the images' bounding boxes. Rather than working by hand, which would be slow - is there any quick way to turn the bounding boxes into a POINTS file for each image, to automate the georectification? Cheers, Richard ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Raster with bounding box
Hi, I would say you have at least 3 way to do that: - use your bounding box points to make a vrt raster for each of your png files - use gdalwarp to georectify your png files - manually write the POINTS files to use with i.rectify (try first to georectify 1 file by hand with the georectify tool, and then go to the group/subgroup directories to study the files structure) for each of those solutions you will need to write a small script to automate the process for all of your files ;) cheers, Sylvain 2012/8/13 Richard Chirgwin rchirg...@ozemail.com.au Hi all, I have a bunch of png format images to import. I also have a csv of the images' bounding boxes. Rather than working by hand, which would be slow - is there any quick way to turn the bounding boxes into a POINTS file for each image, to automate the georectification? Cheers, Richard __**_ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/**mailman/listinfo/grass-userhttp://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Raster with bounding box
Sylvain wrote: - use your bounding box points to make a vrt raster for each of your png files - use gdalwarp to georectify your png files here's a couple of other ways too: translate the bounding box into a world file (a little bit of automatable math is involved), call it by the same filename as the .png image but with a .wld extension, use r.in.gdal to import it, it will see the world file and geo-ref the PNG automatically. http://gdal.org/frmt_various.html#PNG or, use gdal_translate to set the bounds and create a geotiff you can import. -a_ullr ulx uly lrx lry: Assign/override the georeferenced bounds of the output file. This assigns georeferenced bounds to the output file, ignoring what would have been derived from the source file. use your bbox to fill in the values. Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Raster with bounding box
On 13/08/12 9:43 PM, Hamish wrote: Sylvain wrote: - use your bounding box points to make a vrt raster for each of your png files - use gdalwarp to georectify your png files here's a couple of other ways too: translate the bounding box into a world file (a little bit of automatable math is involved), call it by the same filename as the .png image but with a .wld extension, use r.in.gdal to import it, it will see the world file and geo-ref the PNG automatically. http://gdal.org/frmt_various.html#PNG or, use gdal_translate to set the bounds and create a geotiff you can import. -a_ullr ulx uly lrx lry: Assign/override the georeferenced bounds of the output file. This assigns georeferenced bounds to the output file, ignoring what would have been derived from the source file. use your bbox to fill in the values. Hamish Thanks Hamish and Sylvain - the gdal_translate worked best, because it was the easiest to automate. I just imported the bounding box values into a database, and ran a selection loop to get the values for gdal_translate. Cheers, Richard ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
