I just get to know about GeoPDF. Can this technique be used by private researchers? If I want to create or edit a GeoPDF file without any commercial software, is it possible (by coding I mean) ? Is GeoPDF open source? Thank you for any one giving me guidance.
QGIS can read/write geospatial PDF. There are some examples on handling geospatPDF but you'll hardly find free applications for editing (retrieve or extract georeferenced layers from geoPDF).
http://nationalmap.gov/ustopo/documents/ustopo2gtif_current.pdf
http://gis.stackexchange.com/questions/9659/converting-geopdf-to-vector-format-like-cad-or-shapefile
http://www.staygeo.com/2013/03/convert-geopdf-maps-to-geotiff-with-gdal.html
http://www.gdal.org/frmt_pdf.html
You have a free plug-in for Adobe Reader on
http://www.terragotech.com/products/terrago-toolbar
and
free converter to geotiff
Thank you for all your valuable answers. Another question, are GeoPDF and Geospatial PDF the same thing?
Yes you can create GeoPDF with QGIS, an open source GIS software:
https://qgis.org/en/site/
By default, PDFs exported from QGIS are GeoPDFs:
https://qgis.org/en/site/forusers/visualchangelog216/index.html#feature-georeference-outputs-eg-pdf-from-composer
You need to make a print composer of your map, then, export to PDF.
To open your GeoPDF in a smartphone or tablet so that you can use to navigate while offline in the field, use Avenza:
https://www.avenzamaps.com/
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