[gdal-dev] Trouble with georeferenced PDF

[Rahkonen Jukka]

Hi,

Good to know. Obviously I will need to make more tests with other computers. This combination (TerraGo Toolbar and Acrobat X reader on Vista (32-bit) for sure does not show metadata correctly for that very same PDF file.

I can see that some metadata is in plain text in the EPSG:32635 file but perhaps as some PDF strings in the EPSG:3067 version. The OGC Best Practise paper seems to suggest using the PDF strings. Perhaps that can make difference with some OS + country setting combination or something.

-Jukka-

________________________________________
Lähettäjä: Even Rouault [even.rouault at mines-paris.org]
Lähetetty: 1. maaliskuuta 2012 21:46
Vastaanottaja: Rahkonen Jukka
Kopio: 'gdal-dev at lists.osgeo.org'
Aihe: Re: [gdal-dev] Trouble with georeferenced PDF

Le jeudi 01 mars 2012 11:43:59, Rahkonen Jukka a écrit :
> Hi,
>
> EPSG:3067 works for me too.

I meant EPSG:32635 sorry. But now, I've downloaded your
http://latuviitta.org/documents/GDAL_OGC_32635.pdf sample and it is properly
recognized by TerraGo toolbar and the coordinates reported are consistant with
gdalinfo output.... And I can see the Document - Page 1 - Map Frame 1
structure.

> The toolbar is installed yesterday from
> TerraGo. I am just an end user and I cannot do any difficult things like
> compiling. I tried to edit the EPSG:32635 description with hex editor and
> changed "/" into "N".  No effect, TerraGo tool bar does not find the
> coordinates.
>
> With EPSG:32635 GeoPDF file properties does not show any document tree
> structure. It is just "Document". With EPSG:3067 it is Document - Page 1 -
> Map Frame 1. Perhaps there is something that truncates the metadata?
>
> -Jukka Rahkonen-
>
> Een Rouault wrote:
> > Selon Rahkonen Jukka <Jukka.Rahkonen at mmmtike.fi>:
> >
> > Nice to see early testers of geospatial PDF writing support !
> >
> > I'm currently behind a corporate firewall that prevents
> > access to your samples,
> > but I did a quick test similar to yours and EPSG:3067 seems
> > to work fine with
> > Terrago Toolbar (v5.7.70). However I suspect that the
> > presence of the unescaped
> > slash (/) in the Description string might be the cause of the
> > issue (if you have
> > a different version of the toolbar). I've not verified if it
> > is allowed or not
> > by the PDF spec, but poppler doesn't seem to have issue with it.
> >
> > So perhaps you could try the following patch that will encode
> > strings with
> > slashes into hexadecimal UTF16 sequences :
> >
> > Index: pdfobject.cpp
> > ===================================================================
> > --- pdfobject.cpp   (revision 24040)
> > +++ pdfobject.cpp   (working copy)
> > @@ -63,7 +63,7 @@
> >
> >      for(i=0;(ch = pabyData[i]) != '?';i++)
> >      {
> >
> >          if (ch < 32 || ch > 127 ||
> >
> > -            ch == '(' || ch == ')' ||
> > +            ch == '(' || ch == ')' || ch == '/' ||
> >
> >              ch == '\' || ch == '%' || ch == '#')
> >              break;
> >
> >      }
> > >
> > > Hi,
> > >
> > > I had a quick test by converting one GeoTIFF into
> >
> > georeferenced PDF files
> >
> > > with different parameters and opening results with Acrobat
> >
> > Reader and TerraGo
> >
> > > toolbar.
> > >
> > > For TerraGo the metadata must be in OGC_BP style and ISO
> >
> > style metadata must
> >
> > > not exist (option BOTH does not work). What is odd is that
> >
> > TerraGo toolbar
> >
> > > finds coordinates if I run gdal_translate with -a_srs
> > > epsg:3067 but not if I run it with -a_srs epsg:32635.
> > > There seems to something different in the PDF headers, here
> >
> > are short
> >
> > > captures
> > > from the beginnings of the files
> > >
> > > EPSG:32635 which is not understood by TerraGo toolbar
> > >
> > > %PDF-1.6
> > > %<bh:ff><bh:ff><bh:ff><bh:ff>
> > > 7 0 obj
> > > << /CTM [ (0.5487347256) 0 0 (0.5487347256) (3409989.640548643)
> > > (6956053.279989699) ] /Description (WGS 84 / UTM zone 35N) /Neatline
> > >
> > > EPSG:3067 which is OK for TerraGo
> > >
> > > %PDF-1.6
> > > %<bh:ff><bh:ff><bh:ff><bh:ff>
> > > 7 0 obj
> > > << /CTM [ (0.5487347256) 0 0 (0.5487347256) (3409989.640548643)
> > > (6956053.279989699) ] /Description
> >
> > <FEFF0045005400520053003800390020002F00200054004D0033003500460
> > 049004E00280045002C004E0029>
> >
> > > /Neatline
> > >
> > > Images are available here
> > > http://latuviitta.org/documents/GDAL_OGC_32635.pdf
> > > http://latuviitta.org/documents/GDAL_OGC_3067.pdf
> > >
> > > -Jukka Rahkonen-
> > >
> > > -Jukka Rahkonen-_______________________________________________
> > > gdal-dev mailing list
> > > gdal-dev at lists.osgeo.org
> > > http://lists.osgeo.org/mailman/listinfo/gdal-dev