[gdal-dev] PDF gets skewed and shifts in geo location raster GeoTIFF

[Even Rouault]

OK, I see. This is quite an unusual formulation of PDF with the mediabox 
having a bottom_y < 0 and top_y = 0 (usually you have bottom_y = 0 and top_y > 
0)
I've fixed the driver to work correctly (at least it is now consistent with the 
Terrago toolbar) with such dataset. Just in that particular case with no PDF 
rotation and OGC BP encoding

Even

> I have the file link here,
> 
> https://drive.google.com/file/d/0B4shTM1bPS5TMFZsc1p3MVZKT3c/view?usp=shari
> ng
> 
> I see the raster's actual location shifted in 3857 projection in both cases
> 
> 1. from pdf to 3857 (Big offset shift)
> 2. pdf to 4326 and then to 3857 (small offset shift)
> 
> gdalwarp -t_srs EPSG:3857 "file03.pdf" "file03_3857.tif"
> 
> gdalinfo "file03_3857.tif"
> 
>   Upper Left (-9778860.18140727, 5289697.46773225)
>   Lower Left (-9778860.18140727, 5287721.4661877)
>   Upper Right (-9776891.4828487, 5289697.46773225)
>   Lower Right (-9776891.4828487, 5287721.4661877)
>   Center (-9777875.83212799, 5288709.54465131)
> 
> gdalwarp -t_srs EPSG:4326 "file03.pdf" "file03_4326.tif"
> 
> gdalinfo "file03_4326.tif"
> 
>   Upper Left (-87.8449956222595, 42.8534861499971)
>   Lower Left (-87.8449956222595, 42.8404719605387)
>   Upper Right (-87.8273112824722, 42.8534861499971)
>   Lower Right (-87.8273112824722, 42.8404719605387)
>   Center (-87.8361534523658, 42.8469797529301)
> 
> gdalwarp -t_srs EPSG:3857 "file03_4326.tif" "file03_3857_from4326.tif"
> 
> gdalinfo "file03_3857_from4326.tif"
> 
>  Upper Left (-9778860.18140727, 5289697.46773225)
>  Lower Left (-9778860.18140727, 5287721.45875241)
>  Upper Right (-9776891.61702531, 5289697.46773225)
>  Lower Right (-9776891.61702531, 5287721.45875241)
>  Center (-9777875.89921629, 5288709.46324233)
> 
> Regards,
> Gane
> 
> On Wed, Sep 23, 2015 at 5:11 PM, Even Rouault <even.rouault at spatialys.com>
> 
> wrote:
> > Le mercredi 23 septembre 2015 12:54:21, Gane R a écrit :
> > > When I convert the above mentioned PDF to a GeoTIFF in EPSG:3857 I get
> > 
> > the
> > 
> > > raster bounds shifted down from the actual raster location, where as
> > 
> > when I
> > 
> > > convert the PDF to GeoTIFF in EPSG:4326 then to EPSG:3857 using
> > > gdalwarp and I get the raster  bounds to the actual location.  any
> > > reasons for
> > 
> > this
> > 
> > > shift ?
> > 
> > Please let the list CC'ed
> > 
> > Could you provide data + command line that demontrates this ?
> > 
> > > On Wed, Sep 23, 2015 at 1:42 PM, Even Rouault <
> > 
> > even.rouault at spatialys.com>
> > 
> > > wrote:
> > > > Gane,
> > > > 
> > > > I don't really understand what you mean. Is there an error in the PDF
> > > > georeferencing (I thought we had addressed that a few months ago), or
> > 
> > are
> > 
> > > > you
> > > > surprised that gdalwarp transforms the image to be north-up ? If it
> > > > is the later, then it is an intended behaviour of gdalwarp.
> > > > 
> > > > Best regards,
> > > > 
> > > > Even
> > > > 
> > > > > There are cases for handling 90 -90 rotation in pdfdataset.cpp
> > > > > I am using poppler with pdfdataset.cpp as in Revision: 28978 of
> > > > > trunk
> > > > > 
> > > > > PDF gets skewed and shifts in geo location raster GeoTIFF, Is there
> > 
> > any
> > 
> > > > > issue in computing the geotransform ?
> > > > > 
> > > > > GeoTransform values are for an pdf at EPSG:4326
> > > > > 10776
> > > > > 6682
> > > > > -87.844995622259475
> > > > > 0.000001374506717
> > > > > 0.000000429963146
> > > > > 42.847234964542217
> > > > > 0.000000580102585
> > > > > -0.000001012112732
> > > > > 
> > > > > Corresponding GeoTransform for GeoTiff in EPSG:3857 after gdalwarp
> > > > > 12529
> > > > > 10422
> > > > > GeoTransform values
> > > > > -9779291.683092894000000
> > > > > 0.166040058992803
> > > > > 0.000000000000000
> > > > > 5290478.766616309100000
> > > > > 0.000000000000000
> > > > > -0.166040058992803
> > > > 
> > > > --
> > > > Spatialys - Geospatial professional services
> > > > http://www.spatialys.com
> > 
> > --
> > Spatialys - Geospatial professional services
> > http://www.spatialys.com

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