1) I took a lot of photos - every space from multiple directions;
2) For each photo, I manually drew the "wireframe" of the space in Inkscape on a separate layer on top of the photo - wall/floor lines, doorways, windows, furniture;
3) I printed out the wireframe layers, grabbed a pencil and a measuring tape, and started to measure.
Step 2) could probably be semi-automated with some edge detection. Step 3) could probably be done if I had any recent experience doing photogrammetry. But fully manual solution wasn't that bad; I did my measurements over the course of a month, and finally made up a full floorplan in SweetHome3D with accurately sized furniture in one evening. This let my wife and me design a new furniture arrangement and buy appropriately sized movables in a single hour.
For people who, like me, lack the "mind's eye" and spatial imagination, having the flat digitized like this has immense value.
> Step 2) could probably be semi-automated with some edge detection.
All 3 steps can be done automatically with magicplan.
However once you get the results you'll probably need to manually measure and adjust because it's not quite accurate enough. But it's a really good start.
1) I took a lot of photos - every space from multiple directions;
2) For each photo, I manually drew the "wireframe" of the space in Inkscape on a separate layer on top of the photo - wall/floor lines, doorways, windows, furniture;
3) I printed out the wireframe layers, grabbed a pencil and a measuring tape, and started to measure.
Step 2) could probably be semi-automated with some edge detection. Step 3) could probably be done if I had any recent experience doing photogrammetry. But fully manual solution wasn't that bad; I did my measurements over the course of a month, and finally made up a full floorplan in SweetHome3D with accurately sized furniture in one evening. This let my wife and me design a new furniture arrangement and buy appropriately sized movables in a single hour.
For people who, like me, lack the "mind's eye" and spatial imagination, having the flat digitized like this has immense value.