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Exporting raster - georeferencing ?

Posted: Fri Apr 24, 2020 2:00 pm
by betadk@gmail.com
When exporting a raster or image, it seems that the global shift / scale is not restored and the raster is therefore not geo-referenced correctly (point cloud was in UTM). Is one supposed to transform to originals outside of CloudCompare ?
Thanks.

Re: Exporting raster - georeferencing ?

Posted: Fri Apr 24, 2020 4:56 pm
by daniel
Global shift should be restored when exporting the raster to geotiff (via the 'Rasterize' tool). But indeed, not when exporting to an image.

Re: Exporting raster - georeferencing ?

Posted: Mon Jul 15, 2024 9:50 am
by libak
Hi Daniel

How do I export a rasta to geotiff while maintaining global shift (scale)?

When I import the geotiff into ACAD, the geotiff is 1mm in length which is not correct - the bounding box in CC is ~39000

Rgds

Re: Exporting raster - georeferencing ?

Posted: Mon Jul 15, 2024 3:05 pm
by daniel
Which version are you using?

And can you explain how you generated the geotiff exactly? From which cloud?

Ideally, if you could share the original cloud and the parameters you used that would help a lot.

Re: Exporting raster - georeferencing ?

Posted: Sun Nov 03, 2024 6:50 pm
by libak
Hi Daniel

I’m using 2.13.1

This is how I generated the geotiff
> select point cloud
> Hit rasterize button
> set parameters
> update grid
> Rasterize viewport shows my point cloud, ok.
> Export > Raster
> Export RGB colors > OK
> Save as type: geotiff (*.tif)
> Save
> In AutoCAD I enter IMAGEATTACH, and set scale to 1
Now the length of the image in ACAD is 1mm

I can’t share the point cloud, but the size of it is not 1mm :-)

Thanks

Re: Exporting raster - georeferencing ?

Posted: Sun Nov 03, 2024 10:15 pm
by daniel
Ah, you duplicated the message... Not sure which thread to follow now...