# Good tie point coverage but dense cloud with huge holes

**URL:** <https://community.pix4d.com/t/good-tie-point-coverage-but-dense-cloud-with-huge-holes/17285>\
**Category:** PIX4Dmapper\
**Created:** [March 24, 2021, 4:53pm UTC](https://community.pix4d.com/t/good-tie-point-coverage-but-dense-cloud-with-huge-holes/17285 "2021-03-24T16:53:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![terraDrone\_PT](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/terradrone_pt/32/2323_2.png) [@terraDrone\_PT](https://community.pix4d.com/u/terraDrone_PT)\
**Post date:** [March 24, 2021, 4:53pm UTC](https://community.pix4d.com/t/good-tie-point-coverage-but-dense-cloud-with-huge-holes/17285/1 "2021-03-24T16:53:58Z")

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Hi,

We mapped a corridor and we got a strange result: the cameras area all calibrated, there are tie points in all the area, but when we process the dense cloud it generates huge holes in areas where the tie point coverage should be more than enough.

Please find attached some examples.  
We work with Pix4D since 2014, and this never happened.

Thanks!

[Error\_examples.pdf](https://community.pix4d.com/uploads/short-url/8ugeDIXBkPUQQKFl93q9x0SvMSL.pdf) (1.5 MB)

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**Author:** ![Yuka](https://avatars.discourse-cdn.com/v4/letter/y/9d8465/32.png) [@Yuka](https://community.pix4d.com/u/Yuka)\
**Post date:** [March 25, 2021, 5:02am UTC](https://community.pix4d.com/t/good-tie-point-coverage-but-dense-cloud-with-huge-holes/17285/2 "2021-03-25T05:02:19Z")

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Hello, it could be related to the overlap of the images, but we will be contacting you directly to investigate further.

Kind regards,