No immediate easy solution that I can think of.
You could break the path up into layers them move and rotate to create a straight line. Going to be tedious with a long winding route.
Or this using one of ofnuts plugins "path-dump.py" Unfortunately this writes to a terminal. I assume Gimp will start in a MacOS terminal. Maybe pipe the output to a text file (gimp > file.txt) and buried in the text is the length of the path.
All in one screenshot. Traced the route with the path tool. (Stoked the path red so you can see it) Applied the plugin. Found the text file and the length (in pixels)
Painted the magenta line in using click-shift-click for straight lines. (length shows in the notification area as you draw). 5.6 Km according to the grid.
I would hang on and see if better more convenient solutions appear.
You could break the path up into layers them move and rotate to create a straight line. Going to be tedious with a long winding route.
Or this using one of ofnuts plugins "path-dump.py" Unfortunately this writes to a terminal. I assume Gimp will start in a MacOS terminal. Maybe pipe the output to a text file (gimp > file.txt) and buried in the text is the length of the path.
All in one screenshot. Traced the route with the path tool. (Stoked the path red so you can see it) Applied the plugin. Found the text file and the length (in pixels)
Painted the magenta line in using click-shift-click for straight lines. (length shows in the notification area as you draw). 5.6 Km according to the grid.
I would hang on and see if better more convenient solutions appear.