I'm trying to use Inkscape to digitalize a diagram of experimental data. This is how I went about it:
1) Get the page in the .pdf document that holds the diagram.
2) Print out this page to another .pdf document.
3) Import the .pdf of the diagram page into Inkscape (with the "fine" import precision).
4) Ungroup everything.
5) Cleanup the text so that it doesn't bother the page size - coordinatization.
6) Resize the page size to the diagram axis span.
7) Set the document units to 'mm'.
8) Draw a path along the line in the diagram.
9) Export the path node coordinates into a .txt, xml, or whatever file. Coordinate system is defined by the document metrics and the page (lower left corner is 0, as the border rules state).
This is the .svg document in question:
Currently, I am stuck on the step 9 of the process. I have found the xml editor within Inkscape, but I haven't been able to find the option to export path data. The "d" attribute now holds values that are far to great to be in milimeters, although the document units are set in milimeters. There are letters like "M" (I believe it stands for "MOVE", I've played around with it) within the "d" attribute of the path. Is there a way to export just the paths I have drawn (I can give them sepparate id-s and names to distinguish them later on)? What is the best place to look for the description of the "d" attribute of a path? How do I sync the document units to the values of the d attribute? I have seen that there is a "transform" option in the xml property window of my path... what is that?
Any advice would be greatly appreciated,