# Sloping cameras

**URL:** <https://community.pix4d.com/t/sloping-cameras/7644>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [December 3, 2018, 1:58pm UTC](https://community.pix4d.com/t/sloping-cameras/7644 "2018-12-03T13:58:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Jonathan\_Martinez\_Di](https://avatars.discourse-cdn.com/v4/letter/j/da6949/32.png) [@Jonathan\_Martinez\_Di](https://community.pix4d.com/u/Jonathan_Martinez_Di)\
**Post date:** [December 3, 2018, 1:58pm UTC](https://community.pix4d.com/t/sloping-cameras/7644/1 "2018-12-03T13:58:20Z")

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Hi everybody,

&nbsp;

If I have a project with sloping cameras, should I disable them? When I mark the GCP on these images, the green cross appears very separated from its true position. So I don’t know if I’ve better disable this cameras or just don’t mark the GCP on this images.

&nbsp;

&nbsp;

Thank you for your feedback

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**Author:** ![Pix4D\_Alumni\_MV](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/pix4d_alumni_mv/32/2071_2.png) [@Pix4D\_Alumni\_MV](https://community.pix4d.com/u/Pix4D_Alumni_MV)\
**Post date:** [December 4, 2018, 2:29pm UTC](https://community.pix4d.com/t/sloping-cameras/7644/2 "2018-12-04T14:29:49Z")

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Hi Michel,

If the green cross indicates the&nbsp; **wrong&nbsp;GCP position** :&nbsp;[Mark the GCPs](https://support.pix4d.com/hc/en-us/articles/202560769) on more images. Every time the GCP is marked on a new&nbsp;image, the green cross gets closer to the correct place. When the green cross is at the correct position&nbsp;in most images, click&nbsp; **Apply**. Then&nbsp;[Reoptimize](https://support.pix4d.com/hc/en-us/articles/202557809) to see if you get better results.

Have you process step 2 and 3? What is the error you get for [GCPs in the Quality Report](https://support.pix4d.com/hc/en-us/articles/202558679-Quality-report-specifications#label15)?

Tip: Clicking the space bar while looking at an image for marking will open the image at the full screen size. It makes marking easier and more accurate.

Hope this will help you,

Kind regards,

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**Author:** ![Jonathan\_Martinez\_Di](https://avatars.discourse-cdn.com/v4/letter/j/da6949/32.png) [@Jonathan\_Martinez\_Di](https://community.pix4d.com/u/Jonathan_Martinez_Di)\
**Post date:** [December 9, 2018, 6:03pm UTC](https://community.pix4d.com/t/sloping-cameras/7644/3 "2018-12-09T18:03:13Z")

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Thanks Marco!