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comp / comp.text.pdf / Re: How can you tell if a PDF file is a georeferenced geopdf?

SubjectAuthor
* How can you tell if a PDF file is a georeferenced geopdf?Enrico Papaloma
+- Re: How can you tell if a PDF file is a georeferenced geopdf?Bill Bradshaw
`- Re: How can you tell if a PDF file is a georeferenced geopdf?Bernd Rose

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Subject: How can you tell if a PDF file is a georeferenced geopdf?
From: Enrico Papaloma
Newsgroups: comp.text.pdf, sci.geo.satellite-nav, alt.comp.os.windows-10, comp.mobile.android
Organization: Gegeweb News Server
Date: Tue, 9 Jul 2024 02:31 UTC
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From: enrico@papaloma.net (Enrico Papaloma)
Newsgroups: comp.text.pdf,sci.geo.satellite-nav,alt.comp.os.windows-10,comp.mobile.android
Subject: How can you tell if a PDF file is a georeferenced geopdf?
Date: Tue, 9 Jul 2024 04:31:28 +0200
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If you have a PDF of any topographic or park map, how can you tell, with
Windows or Android mapping tools, if the map is a georeferenced geoPDF?

Subject: Re: How can you tell if a PDF file is a georeferenced geopdf?
From: Bill Bradshaw
Newsgroups: comp.text.pdf, sci.geo.satellite-nav, alt.comp.os.windows-10, comp.mobile.android
Date: Tue, 9 Jul 2024 17:25 UTC
References: 1
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From: bradshaw@gci.net (Bill Bradshaw)
Newsgroups: comp.text.pdf,sci.geo.satellite-nav,alt.comp.os.windows-10,comp.mobile.android
Subject: Re: How can you tell if a PDF file is a georeferenced geopdf?
Date: Tue, 9 Jul 2024 09:25:43 -0800
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Enrico Papaloma wrote:
> If you have a PDF of any topographic or park map, how can you tell,
> with Windows or Android mapping tools, if the map is a georeferenced
> geoPDF?

Did you open the file as text to see if there was any information in it that
would answer your question?
--
<Bill>

Brought to you from Anchorage, Alaska

Subject: Re: How can you tell if a PDF file is a georeferenced geopdf?
From: Bernd Rose
Newsgroups: comp.text.pdf, sci.geo.satellite-nav, alt.comp.os.windows-10
Followup: sci.geo.satellite-nav
Date: Tue, 9 Jul 2024 18:04 UTC
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From: b.rose.tmpbox@arcor.de (Bernd Rose)
Newsgroups: comp.text.pdf,sci.geo.satellite-nav,alt.comp.os.windows-10
Subject: Re: How can you tell if a PDF file is a georeferenced geopdf?
Followup-To: sci.geo.satellite-nav
Date: Tue, 9 Jul 2024 20:04:47 +0200
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On Tue, 9th Jul 2024 04:31:28 +0200, Enrico Papaloma wrote:

> If you have a PDF of any topographic or park map, how can you tell, with
> Windows or Android mapping tools, if the map is a georeferenced geoPDF?

By looking for coordinate reference system (CRS) information inside it.

GUI solution with QGIS (https://www.qgis.org):
* select the Pdf file in question inside the QGIS file browser
* open the Pdf file as if it were a folder by clicking on the triangle
symbol, which is shown in front of the file name
* you should see either pages or layers of that Pdf as separate entries
(at least one)
* right click on one of these pages/layers and select "Properties"
* look, whether a the property sheet contains any valid CRS information

Command line solution with GDAL (https://gdal.org/download.html):
gdalinfo example.pdf | find "CRS["

If this command returns empty, no CRS information has been found.

HTH.
Bernd
(F-Up set to sgs-n)

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