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How to extract points from a geo-tagged (geo referenced) PDF with c#
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(227.2, 0%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EP%3C/text%3E%3C/svg%3E)
Phunction
206
Reputation points
0
I am trying to extract the point data from a geo referenced PDF in C#. Would something like PDFSharp work? For example a PDF map exported for ESRI ArcMap. I can see some information in the PDF like this:
<</Type/PROJCS/WKT(PROJCS["NAD_1983_BC_Environment_Albers",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting",1000000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-126.0],PARAMETER["Standard_Parallel_1",50.0],PARAMETER["Standard_Parallel_2",58.5],PARAMETER["Latitude_Of_Origin",45.0],UNIT["Meter",1.0]])>>endobj 56 0 obj <</Type/Measure/Subtype/GEO/Bounds[0 1 0 0 1 0 1 1 ]/GPTS[50.63467 -120.10634 50.63738 -120.10599 50.63716 -120.10192 50.63446 -120.10227 ]/LPTS[0 1 0 0 1 0 1 1 ]/GCS 55 0 R>> endobj
While I could probably get the above info parsing it myself, but I don't see any Point information for the Easting/Northing(long/lat) of the points. Any pointers would be appreciated. If PDFSharp will supply the info I need, that would be great, but I am not really sure how a PDF is geotagged.
C#
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(115.19999999999999, 4%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETY%3C/text%3E%3C/svg%3E)
Timon Yang-MSFT 9,576 Reputation points2020-12-24T02:11:02.987+00:00 @Phunction
Is this a GeoPDF or Geospatial PDF?
In addition, PDFSharp is a third-party package, you'd better go to the forum they provide to get support, many members here may not be familiar with it. -
Phunction 206 Reputation points
2020-12-24T18:39:09.127+00:00 It would be a geospatial. I was hoping there may be a few libraries I could choose from.
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Timon Yang-MSFT 9,576 Reputation points
2020-12-25T05:42:54.767+00:00 @Phunction
Microsoft does not provide a package for parsing Geospatial PDF, so I can only find some third parties on GitHub such as this: Geo.
But like I said before, I am afraid you need to ask the author to know the usage of this package.
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