> On Aug 27, 2017, at 8:54 PM, Anna Petrášová <kratocha...@gmail.com> wrote: > > On Tue, Aug 22, 2017 at 7:46 PM, Jeshua Lacock <jes...@3dtopo.com> wrote: >> >> To hopefully help troubleshoot; I just reprojected one of the raster tiles >> (from epsg: 3857), into the source location of one of the lonlat vectors >> (reverse projections from my OP), and the datasets are offset by the same >> distances. Since the dimensions of the raster are being changed (by r.proj), >> it leads me to think it must be a datum or coordinate system misalignment >> and not a projection issue. > > I have the same problem, working with NAIP imagery. It is related to: > https://trac.osgeo.org/grass/ticket/2229 > > I have to remove nadgrids: @null from the PROJ_INFO file to be able to > reproject into that location, but then it is shifted. gdalwarp helps.
Hi Anna! Thank you very much for confirming that! I am working with the NAIP imagery as well. :) I have found that their original Geotiff assets work perfectly. In fact, I was very happy to stumble on to the fact that the complete NAIP archive (~250 terabytes) is available as a bucket drive on Amazon Web Services (AWS). So I setup GRASS instances to process the tiles, then download the processed, reprojected images compressed as JP2s. I am paying for the bandwidth and compute time, but I think its worth it for my purposes. I’ll be able to process and download the imagery I need in about 60 days compared to over 300 days without AWS! Cheers, Jeshua Lacock Founder/Engineer <3DTOPO.com> GlassPrinted.com _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
