Posted by dellus on May 08, 2018; 11:03am
URL: https://forum.librecad.org/Newbie-query-tp5715978p5715979.html

Wrong tree, woof. Probably.
There is no way to correct perspective distortion in LC. If you have aerial photos made with the lens axis perpendicular to the earth surface, you could import such a photo, scale it according to a known distance and rotate it. Then you can measure any other distance, or draw the outlines of objects over the photo.
You can define a point as zero and then read the relative coordinates of other points. But how to extract geographical coordinates, you need a different tool for that. CSV file, what's that?