Georeferanced Image Scale is Wrong

[sinanbader]

Hello,

 

I georeferenced a drawing and got a georeferenced image. But when i put the dwg file in i realized the georeferenced image scale was off. ıs there anyway to correct it.

 

Thanks in advance.

[cberg]

For those who are more landscape design capable.... 

 

Is there a trick to importing a georeferenced tiff image into VW?  I know the tile is 10,000' x 10,000', per the GIS xml data (attached), so I was able to scale the image manually. 

 

I tried setting the document units to Survey Feet and Meters.  Per VW Help...  https://app-help.vectorworks.net/2021/eng/VW2021_Guide/Import/Importing_georeferenced_images.htm 

 

Both times the resultant image scaled at 1111.11'  When I imported the image in QGIS, it came in perfectly, so I know the file works. It is too big to post.  Also the image color is better.

Geospatial xml data is attached for reference. 

 

VW Import Result (Scaled and Rotated)

 

 

QGIS Import (Looks a lot nicer)

 

40001400PAS_PEMA_2022-fin.pdf

[Jeff Prince]

@cberg did you set up your VWX file with the same georeferencing and projection settings as the image?

If so, when you import the image it should come in correctly and get reprojected to match the system you specify.

If not, nonuniform scaling issues is the result because the image is coming in with an orthographic rather than a geographic projection.

[cberg]

I have set the coordinate system to match the state plane coordinate system that was specified in the xml file. 

 

 

I selected importing as a bitmap (as opposed to image resource)

I tried selecting Jpeg and png in alternate imports.

I have played around with using the document vs image coordinate system

I have changed the World file units to Survey Feet and Meters

 

In all instances, the image is 1111 feet wide when it should be 10,000 feet wide. So, the image is off by an approximate factor of nine. 

 

[cberg]

So, the scale of the drawing layer appears to affect the scale of the georeferenced image, much like it would a regular image. I am beginning to think that georeferenced tiff images do not work correctly in VW2023/2024.  Or maybe they never did.

 

For the image I am using to work, I have to set up a custom drawing scale at 1:432 (which is not any real scale I am aware of...) so that the tile image result is 10,000' x 10,000'. 

Edited August 31 by cberg

[Poot]

@Tamsin Slatter might have some pointers on this?