My apologies on typing the link and adding an 's' to the name. Should be ftp://ftp.coast.noaa.gov/tmp/kwaters/autocad_issue.zip
Thanks for the tip on the configuration option! I agree about the ideal solution. Kirk On Thu, Oct 7, 2021 at 3:59 PM Even Rouault <even.roua...@spatialys.com> wrote: > Kirk, > > the download link doesn't work. > > GDAL 3.3 will use geotiff 1.1 conventions by default when a compound CRS > is used. You may try adding -co GEOTIFF_VERSION=1.0 to force GeoTIFF 1.0. > > When reading a GeoTIFF 1.1 file, GDAL will report the compoundCRS. For > GeoTIFF 1.0 files, you need to specify --config GTIFF_REPORT_COMPD_CS YES > (see https://gdal.org/drivers/raster/gtiff.html#configuration-options) > > Autocad users should ideally report that to their vendor so they add > support for GeoTIFF 1.1 (or maybe the issue is not much the change of the > version number, but that we stripped down the formulation of geokeys to the > minimum to avoid specifying things twice and the risk of contradiction) > > Even > Le 07/10/2021 à 21:41, Kirk Waters - NOAA Federal via gdal-dev a écrit : > > Hi all, > I'm finding a change in georeferencing between GDAL 2.4 and 3.x that > results in AutoCAD not being able to figure out where on earth a geotiff > should be. I don't have AutoCAD, so I'm reliant on what my downstream users > are telling me. These are elevation Tiffs, so they do have a vertical > component to the SRS and that may be where the difference lies. I know it > isn't up to GDAL to solve AutoCAD's lack of standards adoption, but I'm > wondering if anyone has come across this and if there's a way to force the > outputs that AutoCAD will read. > > Two small files are included in a zip file at > ftp://ftp.coast.noaa.gov/tmp/kwaters/autocad_issues.zip. One > (Job640647_ches_coned.tif, made with GDAL 2.4) has georeferencing that > works in AutoCAD, the other was made with GDAL 3.3.1 and has georeferencing > that fails. Both were made with gdal_translate -a_srs EPSG:3582+6360 with > the difference being the version of GDAL. They are not the exact same > location on the ground. > > If I look at the files with listgeo, the older version has more tags and > includes the horizontal and vertical units. With gdalsrsinfo, the newer one > shows the more complete COMPOUNDCRS that includes the vertical component. > > I'm hoping I don't have to go back to GDAL 2.4 for AutoCAD users. If > anyone has come across a solution before, I'd love to hear it. > > Thanks, > > Kirk Waters, PhD | NOAA Office for Coastal Management > Applied Sciences Program | 2234 South Hobson Ave > | Charleston, SC 29405 > > > > _______________________________________________ > gdal-dev mailing > listgdal-dev@lists.osgeo.orghttps://lists.osgeo.org/mailman/listinfo/gdal-dev > > -- http://www.spatialys.com > My software is free, but my time generally not. > >
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