[gdal-dev] GeoPDF

[Nyall Dawson]

On 16 Jun 2016 21:27, "Frank Broniewski" <frank.broniewski at gmail.com> wrote:
>
> Ok, finally l found some time to investigate into making GeoPDF files
from QGIS map composer PDFs. I've created a small python script to aid me
in the creation of the GeoPDF (https://github.com/frankbroniewski/GeoPDF).
It basically takes parameters from QGIS (map position in the page, map
extent) and writes them to the PDF. There are 2 screenshots in the git
which show the current data values for my test.pdf test subject. The
map-composer.png shows the map in the QGIS map composer with the important
values for georeferencing at the right side. layer-in-qgis.png shows the
(unfortunately misaligned) GeoPDF in the QGIS main window.
> My gdal_edit call is as follows:
>
> gdal_edit.bat -mo "NEATLINE=POLYGON((30 30, 30 170, 220 170, 220 30, 30
30))" -a_srs "EPSG:31466" -a_ullr 2549800.000 5491000.000 2555800.000
5486600.000 test.pdf
>
> From reading the docs (the OGC ones) I thought creating a neatline and
adding coordinates to it would be more or less sufficient. Looking at
layer-in-qgis.png shows that gdal_edit did not (as what I expected at
first) write the coordinates to the neatline but to the whole page area.
>
> Is there a way to add the coordinates to the neatline instead of the
whole PDF page? I could calculate the page's extent and use these values,
but maybe there's a more clever approach?

I can't help with this, but you may be interested to know that QGIS 2.16
will natively georeference composer PDF outputs. This feature was added
during the recent hackfest in Girona.

Cheers,
Nyall

>
> I've also noticed that Adobe Acrobat Reader does not display any
coordinates when using the measurement tool. Any ideas why this is not
working?
>
> The python script (polygon.py - the name's somewhat stupid) is atm only
used to assemble the gdal_edit call while taking the map extent and map
frame aka neatline position along with an epsg code. I'm on windows
(osgeo4w64) and using subprocess.call on gdal_edit causes an error with the
-a_ullr switch. Probably some parsing errors or whatnot. Anyway, copy&paste
is as good for the moment.
>
> So, any comments on how to proceed with the neatline are greatly
appreciated.  I will continue to do my own research and report back on any
successful steps achieved.
>
> Frank
>
>
>
> Am 18.05.2016 um 16:50 schrieb Frank Broniewski:
>>
>> Hi,
>>
>> I want to turn my QGIS map composer PDF into a GeoPDF or a geospatial
PDF. Unfortunately that is not supported, just on a per layer basis from
within the main program. I could export my map to TIFF with a world file
and use GDAL on that, but I'd like to maintain the vectors and text in the
output.
>> Since GDAL supports the creation of GeoPDF, I'd like to ask if there is
some kind of documentation on the web where the standard is described of if
someone knows an OpenSource library which supports the creation of GeoPDF.
>> I thought of writing a, preferable in Python, program which would add
the necessary tags and data to the PDF in order to turn it into a GeoPDF.
But I am already stuck at the beginning, because I simply cannot find a
good standard documentation. What does GDAL do to turn a raster file into a
GeoPDF? I guess I could read the source, but I have no clue on the
C-language so I thought I ask here beforehand.
>>
>> Thanks,
>>
>> Frank
>
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20160616/c6f9a9e5/attachment.html>