A Dissabte, 27 de març de 2010, Phil Endecott va escriure: > Phil Endecott wrote: > > I need to extract the geolocation metadata from a GeoPDF file. > > > > If you're not familiar with this format, it's something that was > > developed by a company called TerraGo Technologies and was adopted as a > > "best practice" by the Open Geospatial Consortium. There is a document > > describing it via http://www.opengeospatial.org/standards/bp (look for > > "GeoPDF"; click-through but free-looking license required). Basically > > it provides a method to associate positions in the document with > > latitude-longitude positions on the ground. > > > > The method used is to define "map frames" that are added to the parent > > PDF page object. As I understand it, there is a new key 'LGIDict' in > > the page object, which is an array of dictionaries one per map frame, > > each of which contains a set of entries like containing matrices, > > bounding boxes etc. that define the geolocation for that frame. > > Well I have cobbled together something that gets the page objects and I > can see the 'LGIDict' that I was looking for. I had to hack Page.h to > make the pageObj public; is there some better way that I should have > been doing that? > > I was confused for a while because the example GeoPDF that I linked to before: > > Here's an example of a GeoPDF file: > > ftp://ftp2.cits.rncan.gc.ca/pub/cantopo/50k_pdf/092/g/cantopo_092g06_pdf. > > zip > > seems to not have the LGIDict, nor anything else additional in the page > object. Of course I assumed by code was wrong for a long time before > suspecting the file. A test with another file got the LGIDict immediately. > > To help with debugging, I was wondering if there is any easy way to > decode the PDF to a point where I can see its unencoded text (or > however one describes this first level of encoding). Specifically the > GeoPDF document describes stuff at this level: > > 105 0 obj > << > /Type /Page > /LGIDict 104 0 R > ...... > > endobj > 104 0 obj > << > /Type /LGIDict > /Version (2.1) > /CTM > ....... > > > What do I have to do to see that?
You can try podofobrowser (not part of poppler) Albert > > > Regards, > > Phil. > > > > > _______________________________________________ > poppler mailing list > [email protected] > http://lists.freedesktop.org/mailman/listinfo/poppler _______________________________________________ poppler mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/poppler
