FAQs on why imported images appear rotated in CAD
When importing imagery using Plex-Earth, you might encounter cases where the imagery may appear rotated. There are several reasons why this occurs.
Why do my imported images appear rotated?
This is a result of the transformation of the earth's three-dimensional, spherical coordinate system, to a two-dimensional X-Y coordinate system in AutoCAD, so, practically, it is the effect of your drawing being georeferenced. The angle of the image's rotation depends on the coordination system and this is why it may differ for each country, system, or even area.
|NOTE: The north direction shown in CAD is not the actual one, but it depends on the georeference used each time.|
How can I resolve this issue and keep my drawing well georeferenced?
First of all, make sure that you have applied the proper coordinate system for your area. If the coordinate system is not correct, you will need to change it and import again your imagery. If your drawing is georeferenced, through Plex-Earth's Quick Georeference Method, you can skip this check.
Once the appropriate coordinate system has been chosen, then the way to resolve this issue and keep the image’s correct georeference is to adjust the shape of the image.
There are two ways to adjust the shape of the image and completely remove this rotation effect.
- Create a rectangle for your area and import a mosaic by selecting a polyline (which is the rectangle). This way Plex-Earth will create a mosaic that will fill your selected area and the rotation effect will not be visible.
- Alternatively, you can create a clipping for the imported imagery and give it the shape you want.
I do not have to strictly work with a georeference system. What can I do?
In this case, you can just choose to rotate the imported imagery via Plex-Earth Editing tools or by creating a raster image for the Plex-Earth mosaic then, use AutoCAD tools to rotate/move the raster image.
|NOTE: By rotating the imagery, the image will lose its georeference accuracy. Moreover, the rotation will not be fixed so any further import of images done will, again, have a rotation when compared to the drawing objects.|
Feel free to contact us at email@example.com for any questions you may have and our Customer Support Team will be glad to assist.