# Calibration/optimization issue

**URL:** <https://community.pix4d.com/t/calibration-optimization-issue/16775>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [February 22, 2021, 8:31pm UTC](https://community.pix4d.com/t/calibration-optimization-issue/16775 "2021-02-22T20:31:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mark5](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@mark5](https://community.pix4d.com/u/mark5)\
**Post date:** [February 22, 2021, 8:31pm UTC](https://community.pix4d.com/t/calibration-optimization-issue/16775/1 "2021-02-22T20:31:47Z")

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Hi Guys. Today we are having a calibration/optimization issue on multiple jobs. Version 4.6.4. The first job adding all GCPs then re-running step 1 fixed it but the job in the photo is still having issues. Oddly enough it looks right when using no GCPs at all but keeps doing this with them.

Any help would be great

 ![Capture.PNG](https://global.discourse-cdn.com/pix4d/original/2X/6/6a552367a175c22cf9b2c9966c7ef1b3e9bfacc4.jpeg)

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**Author:** ![Christina](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/christina/32/303_2.png) [@Christina](https://community.pix4d.com/u/Christina)\
**Post date:** [February 24, 2021, 11:05am UTC](https://community.pix4d.com/t/calibration-optimization-issue/16775/2 "2021-02-24T11:05:30Z")

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Hello, could you please upload the 2 quality reports, one with the GCPs and one without the GCPs?

Thank you

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**Author:** ![mark5](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@mark5](https://community.pix4d.com/u/mark5)\
**Post date:** [February 24, 2021, 8:20pm UTC](https://community.pix4d.com/t/calibration-optimization-issue/16775/3 "2021-02-24T20:20:54Z")

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Hi,

No issues with GCPs (Even though it looks like it must be)  
Choosing Geometrically Verified matching in advanced options Step 1 has fixed the issue but I am frustrated about why this has happened suddenly

I have completed around 300 projects with Pix4d and have never had to choose this option in the past.  
Having this issue on 2 projects has cost me considerable time and money and made me question Pix4d’s current reliability.

Is this a version issue?  
Or should all projects have this option ticked now?

Thanks  
Mark

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**Author:** ![Blaz](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/blaz/32/4344_2.png) [@Blaz](https://community.pix4d.com/u/Blaz)\
**Post date:** [February 25, 2021, 7:38am UTC](https://community.pix4d.com/t/calibration-optimization-issue/16775/4 "2021-02-25T07:38:40Z")

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Thanks for letting us know that using the [Geometrically Verified Matching](https://support.pix4d.com/hc/en-us/articles/205433155-Menu-Process-Processing-Options-1-Initial-Processing-Matching) solved the issue.

I don’t think it has to do anything with the Pix4Dmapper version but rather with the content of images. If there are many similar features in the area than this option can help to get better results.

If you see that you get optimal results by changing some options you can consider creating your own template and apply it for all the project. See more in the [How to create a User Processing Options Template](https://support.pix4d.com/hc/en-us/articles/205507149) article.

I hope this helps,