# Why is the camera upside down from the images? **URL:** \ **Category:** PIX4Dmapper Questions/Troubleshooting\ **Created:** [January 4, 2018, 11:59pm UTC](https://community.pix4d.com/t/why-is-the-camera-upside-down-from-the-images/4345 "2018-01-04T23:59:28Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Samantha\_Collins](https://avatars.discourse-cdn.com/v4/letter/s/f14d63/32.png) [@Samantha\_Collins](https://community.pix4d.com/u/Samantha_Collins)\ **Post date:** [January 4, 2018, 11:59pm UTC](https://community.pix4d.com/t/why-is-the-camera-upside-down-from-the-images/4345/1 "2018-01-04T23:59:28Z")
I just started using Pix4D recently.  One of my colleagues taught me how to create a project and process it. The camera which is a on the project I created seemed to be upside down (if impossible) when compared with my other works. Any advice or solution will be very much apprec iated.   ---
**Author:** ![Pierangelo\_Rothenbuhler](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/pierangelo_rothenbuhler/32/2439_2.png) [@Pierangelo\_Rothenbuhler](https://community.pix4d.com/u/Pierangelo_Rothenbuhler)\ **Post date:** [January 8, 2018, 10:09am UTC](https://community.pix4d.com/t/why-is-the-camera-upside-down-from-the-images/4345/2 "2018-01-08T10:09:16Z")
Hi Samantha,  Thanks for describing the issue and for posting screenshots. In your screenshot it seems as if there are no coordinates assigned to the images, but that the coordinate system of the images is set to WGS 84/UTM zone 30N:  This explains why there are only green and no blue camera icons in the second screenshot, as only the optimized positions are displayed (all initial positions being at (0,0,0)). I think this explains why the end up reversed, as there is no reference which can be used to correctly orient the project.  If you have the image coordinates adding them should solve the issue. If you do not have them, I would modify the image coordinate system (and output coordinate system) to “Arbitrary” and then add an orientation constraint to the project if it is still reversed.  Here are articles that should be helpful:  - Orientation constraint: [https://support.pix4d.com/hc/en-us/articles/205360385](https://support.pix4d.com/hc/en-us/articles/205360385) - Arbitrary image and output coordinate systems: [https://support.pix4d.com/hc/en-us/articles/202558239](https://support.pix4d.com/hc/en-us/articles/202558239) Keep us posted if you can fix the project or need further help. 🙂 ---
**Author:** ![Samantha\_Collins](https://avatars.discourse-cdn.com/v4/letter/s/f14d63/32.png) [@Samantha\_Collins](https://community.pix4d.com/u/Samantha_Collins)\ **Post date:** [January 8, 2018, 12:55pm UTC](https://community.pix4d.com/t/why-is-the-camera-upside-down-from-the-images/4345/3 "2018-01-08T12:55:39Z")
After modifying the image coordinate system, can I manually add tie points in to georeference it since I got ground control points established on the site?  ---
**Author:** ![Pierangelo\_Rothenbuhler](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/pierangelo_rothenbuhler/32/2439_2.png) [@Pierangelo\_Rothenbuhler](https://community.pix4d.com/u/Pierangelo_Rothenbuhler)\ **Post date:** [January 9, 2018, 7:48am UTC](https://community.pix4d.com/t/why-is-the-camera-upside-down-from-the-images/4345/4 "2018-01-09T07:48:51Z")
Sure, I would recommend to follow Method B in this article:  [https://support.pix4d.com/hc/en-us/articles/202560239#label2](https://support.pix4d.com/hc/en-us/articles/202560239-How-to-include-GCPs-in-the-Project#label2) I copy the content for convenience:  **Instructions** 1. Obtain GCPs measurements in the field or through other sources: [202557489](https://support.pix4d.com/hc/en-us/articles/202557489).  2. On the Menu bar, click  **View**   **\> ** \*\* Processing **.**  \*\*The _Processing_ bar appears at the bottom of the Main Window. 3. Select \_1. Initial Processing \_and deselect \_2. Point Cloud and Mesh \_and _3. DSM, Orthomosaic and Index._ 4. Click  **Start**. 1. Add / import and mark  **ONLY ** \*\* 3 \*\*of the GCPs in the _rayCloud_: [202560109](https://support.pix4d.com/hc/en-us/articles/202560109). 2. After having imported the  **3 ** GCPs and having reoptimized the reconstruction, add / import the remaining GCPs with the _GCP /MTP Manager_  **WITHOUT**  marking them: [202560039](https://support.pix4d.com/hc/en-us/articles/202560039). 3. Mark the GCPs in the rayCloud: [202560769](https://support.pix4d.com/hc/en-us/articles/202560769). 4. Click Process \> Reoptimize. 9. (optional) Regenerate the Quality Report by clicking  **Process \> Generate Quality Report**.