Posted by LordOfBikes on Jun 25, 2020; 6:20am
URL: https://forum.librecad.org/Can-I-define-distances-between-points-in-Librecad-2-1-3-tp5719156p5719157.html

This is basically no problem. You just have to measure the current diameter of the pool in the drawing and calculate the scale factor. Then scale the image, that you have 1:1 scale or possibly 1:10.

But consider the distortion in the image. The camera optic has a wide angle, the farther the distance to the center is, the bigger is the distortion. Also the height matters. The pool or tents have different scales depending where you measure them, on the floor or on their top.

What I would do is to place some poles or stone tiles around the pool in a 30 or 40 feet square for the picture. Then use GIMP to correct barrel and rhombus distortion before the LibreCAD import.
But this will be still an approximation and absolutely need some real world proof when the plans are finished.

Armin