Applies to: any Plex-Earth version Audience: End users
Overview
When importing imagery using Plex-Earth, you may notice that the image appears rotated relative to your drawing objects or the CAD canvas. This is expected behavior in many cases and is directly related to how your drawing is georeferenced.
This article explains why this happens and provides three approaches to handle it depending on your workflow needs.
Why Does This Happen?
The rotation is a result of converting the Earth's three-dimensional, spherical coordinate system into the two-dimensional X-Y coordinate system used in AutoCAD. When a projected coordinate system is applied to your drawing, the North direction in CAD does not necessarily align with the vertical axis of the screen — it depends on the coordinate system used and the geographic location of your project.
This means:
The rotation angle will vary depending on your coordinate system and project location
The imagery itself is correctly georeferenced — it is the coordinate system transformation that causes the visual rotation
This is not an error in Plex-Earth or your imagery
⚠️ The North direction shown in AutoCAD is not always the true geographic North. It depends on the coordinate system applied to the drawing.
Which Approach Is Right for You?
Choose the approach that best fits your workflow:
| Situation | Recommended approach |
|---|---|
| You need to keep the drawing accurately georeferenced | Approach 1: Clip the Image or Approach 2: Apply a Rotation via Site Area |
| You do not need strict georeferencing | Approach 3: Rotate the Raster Image Manually |
Approach 1: Clip the Image to Remove the Visual Rotation
The simplest way to handle the rotation while keeping your georeference intact is to adjust the shape of the imported image so the rotated edges are no longer visible.
There are two ways to do this:
Option A: Import a mosaic using a polyline boundary:
Draw a rectangle or polygon over your area of interest in CAD
When importing your Imagery Mosaic, select the polyline as the coverage boundary
-
Plex-Earth will create a mosaic that fills exactly that shape, and the rotation effect will not be visible within the boundary
Option B: Apply a clipping boundary to an existing image:
Select the imported imagery
Use Plex-Earth's Edit Imagery tools to apply a clipping boundary
-
Define the clip shape to match your area of interest — the rotated edges outside the clip will be hidden
💡 If you inserted the image as a raster file, you can also apply clipping using AutoCAD's native image clipping tools. Select the image and the clipping options will appear in the ribbon.
Approach 2: Apply a Rotation to the Drawing via Site Area
If you want to rotate the entire drawing so that imagery aligns with the screen orientation rather than just hiding the rotated edges, you can apply a rotation transformation through the Site Area tool. This keeps the drawing fully georeferenced while adjusting the visual orientation.
Make sure the correct coordinate system is applied to your drawing
Go to the Plex-Earth ribbon and select Site Area
Define your project area
In the Site Area preview, go to Transform → Rotate
Apply the desired rotation angle
Select Apply to Drawing
💡 This approach is ideal when you need the drawing to appear "upright" on screen while maintaining accurate georeferencing for measurements, exports, and CAD operations.
Approach 3: Rotate the Raster Image Manually
If you do not need to strictly work within a georeferenced coordinate system, you can insert the imagery as a raster image and use AutoCAD's standard tools to rotate and position it manually.
Import your imagery as a raster image (or convert your mosaic to raster first)
Use AutoCAD's ROTATE command or the rotation grip to align the image as needed
❗ Warning: Rotating the imagery manually will cause it to lose its georeference accuracy. Any further imagery imports will again appear rotated relative to your manually rotated image, since the coordinate system transformation has not changed. This approach is only suitable for workflows where precise georeferencing is not required.
Still Having Issues?
If your imagery is rotating unexpectedly and you are not sure which coordinate system is applied, or if the rotation seems incorrect for your area, contact our support team with your drawing for further investigation.
FAQs
Is the rotation a bug in Plex-Earth?
No. The rotation is a natural consequence of applying a projected coordinate system to a CAD drawing. It reflects the mathematical transformation from a spherical Earth to a flat 2D plane. The imagery is correctly georeferenced — it is the coordinate system that determines the visual orientation.
My imagery was not rotated before but now it is. What changed?
The most likely cause is a change in the coordinate system applied to your drawing. Check your current georeference settings and compare them with your previous setup. If you recently applied a new coordinate system or georeference, that would explain the change.
Will the rotation affect the accuracy of my measurements in CAD?
No. As long as the correct coordinate system is applied and you are using Approach 1 or Approach 2, all measurements and CAD operations remain accurate. The rotation is purely visual — it does not affect the underlying georeferenced data.
Which approach is best if I need to export to Google Earth or another GIS tool?
Use Approach 1 or Approach 2, both of which preserve full georeferencing. Approach 3 (manual rotation) breaks the georeference and will cause misalignment when the drawing or imagery is used in Google Earth, ArcGIS, QGIS, or any other georeferenced environment.
The rotation angle is very large — almost 90 degrees. Is this normal?
A large rotation angle is usually a sign that the wrong coordinate system has been applied to your drawing. Correct coordinate systems for your area typically introduce only a moderate rotation angle. If you are seeing a very large rotation, check that the applied coordinate system is appropriate for your project location — using a coordinate system outside its intended boundaries can produce extreme angles. If you are unsure which coordinate system to use, contact us at support@plexscape.com for guidance.
Can I reduce the rotation by choosing a different coordinate system?
Yes, in some cases. If a wrong or out-of-boundaries coordinate system is applied, switching to the correct one for your area can significantly reduce the rotation angle. However, small rotations are expected in most cases and are a natural result of the coordinate system transformation — they cannot be eliminated entirely. Choosing a coordinate system purely for visual reasons rather than accuracy is generally not recommended. If you are unsure which coordinate system is most appropriate for your project, contact us at support@plexscape.com.
Related Questions
This article explains why Plex-Earth imagery appears rotated in AutoCAD or Civil 3D and how to fix it, including clipping, rotation via Site Area, and manual raster rotation. You may have searched for:
- Plex-Earth imagery is rotated or tilted in AutoCAD
- Imported satellite image is not aligned with my drawing
- Why is my map or aerial photo showing at an angle in CAD
- How to fix rotated imagery in Plex-Earth
- How to straighten or align satellite imagery in AutoCAD or Civil 3D
- Imagery rotation caused by coordinate system in AutoCAD
- How to rotate a raster image or mosaic in Plex-Earth to match my drawing