I have land plot plans on the internet and as jpgs which I wish to use, scaled, as the base of a building design drawing.
How can I get the land plan into a drawing, scaled?
Windows 10, QCAD Pro 3.27.10
Importing ground plan jpg
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Always indicate your operating system and QCAD version.
Attach drawing files and screenshots.
Post one question per topic.
Re: Importing ground plan jpg
Hi,
When supported it can be simply imported at a certain scale, angle and so on.
See Options Bar after selecting a file to import.
When all mentioned sources are bitmaps:
A jpg is a pixel based source and not the best source because it suffers from decompression artifacts.
The best source would then be the original file that was used to create the jpgs.
Practically you need to trace over this to convert it to vector format.
Once in vector format we can scale that to any size without loosing information.
There are many Applications that can trace bitmaps automatically but there are as many results too.
How to insert a bitmap to scale and trace over it is explained in several topics.
Basically:
Import Bitmap (IM) on a certain layer, set it in the background, set some workable fade, lock layer.
Now draw (trace) over your picture with various QCAD tools.
Finally unlock the picture layer and scale everything to a know size in your picture.
It might be required to do that in 2 dimensions.
Remind that a real photo can suffer from lens distortion.
You can also scale the bitmap first to a known size ... The end result would be the same.
Standard QCAD imports bitmaps as 1 pixel per drawing unit but provides a height, width and angle entry field in the Options Toolbar.
Most value fields can do calculations for you.
Remind that the picture is not stored in the dxf/dwg file, it is only linked, so you need to keep the files together.
Recently QCAD is equipped with a bitmap tracing tool.
At the moment I have no experience with that.
Regards,
CVH
All depends on what file format is used for the land plot plans.
When supported it can be simply imported at a certain scale, angle and so on.
See Options Bar after selecting a file to import.
When all mentioned sources are bitmaps:
A jpg is a pixel based source and not the best source because it suffers from decompression artifacts.
The best source would then be the original file that was used to create the jpgs.
Practically you need to trace over this to convert it to vector format.
Once in vector format we can scale that to any size without loosing information.
There are many Applications that can trace bitmaps automatically but there are as many results too.
How to insert a bitmap to scale and trace over it is explained in several topics.
Basically:
Import Bitmap (IM) on a certain layer, set it in the background, set some workable fade, lock layer.
Now draw (trace) over your picture with various QCAD tools.
Finally unlock the picture layer and scale everything to a know size in your picture.
It might be required to do that in 2 dimensions.
Remind that a real photo can suffer from lens distortion.
You can also scale the bitmap first to a known size ... The end result would be the same.
Standard QCAD imports bitmaps as 1 pixel per drawing unit but provides a height, width and angle entry field in the Options Toolbar.
Most value fields can do calculations for you.
Remind that the picture is not stored in the dxf/dwg file, it is only linked, so you need to keep the files together.
Recently QCAD is equipped with a bitmap tracing tool.
At the moment I have no experience with that.
Regards,
CVH
-
LouiseSJPP
- Junior Member
- Posts: 18
- Joined: Sat Dec 30, 2017 12:51 pm
Re: Importing ground plan jpg
There's a lot to work through there, but I now know which way to go. Many thanks for the detailed answer 
Updated: Scan2CAD did a good conversion job and got all the jpgs into QCAD, soon scaled correctly. Excellent!
Updated: Scan2CAD did a good conversion job and got all the jpgs into QCAD, soon scaled correctly. Excellent!