# Wrong Height measurements

**URL:** <https://community.pix4d.com/t/wrong-height-measurements/6924>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [July 20, 2018, 2:04pm UTC](https://community.pix4d.com/t/wrong-height-measurements/6924 "2018-07-20T14:04:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Martin\_Allitt](https://avatars.discourse-cdn.com/v4/letter/m/a9a28c/32.png) [@Martin\_Allitt](https://community.pix4d.com/u/Martin_Allitt)\
**Post date:** [July 20, 2018, 2:04pm UTC](https://community.pix4d.com/t/wrong-height-measurements/6924/1 "2018-07-20T14:04:51Z")

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Hi,

I flew a mission at 40 meters ground height with about 16 GCP at a measured&nbsp;altitude of about 52 meters over the sea level, but when processing the images in Pix4d it shows an altitude of -25m in the images&nbsp;which doesn’t&nbsp;make any sense not even in the case it was measured below the sea level. Any ideas why I am getting this values?

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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:** [July 20, 2018, 3:26pm UTC](https://community.pix4d.com/t/wrong-height-measurements/6924/2 "2018-07-20T15:26:42Z")

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Hi Martin,&nbsp;

We observed this behavior before and I would recommend checking&nbsp;the following post for more information:&nbsp;[Negative Altitude Values](https://community.pix4d.com/t/5224-Negative-Altitude-Values)

I encourage you to post any&nbsp;additional questions there so we&nbsp;avoid duplicate posts.

Best,