Posted by dellus on Aug 15, 2024; 2:04pm
URL: https://forum.librecad.org/Dimensions-vs-X-Y-coordinates-tp5725199p5725233.html

Hello AZPS

Have you solved the issue or have you given up? There has not been any further response by you.

Basically the proper procedure is to set up a drawing with the units and scale to be used (General scale = reciprocal value of intended scale, to set right size for text and arrows of dimensions), leave Length factor at 1.
Then import the image and measure a distance in it of which you know the real world length. Calculate the needed scaling factor and scale the image with Modify - Scale.
If I understand you right you want to use an image (scan or bitmap from pdf) of the application form as background in the drawing.
So the size of the application form multiplied by the reciprocal intended scale value (like General scale) is the known real world length. To make things easier you can add a rectangle/frame to the drawing according to the application form's size.
In Print Preview then set scale accordingly and position it on the sheet.

I don't know what the size of the application form and the expected scale is, but here is a sample drawing for letter size and scale 1/16"=1'.
arch_inch_1_192_letter.dxf