# Piles of points/pixels in the middle of a flat road. Please help

**URL:** <https://community.pix4d.com/t/piles-of-points-pixels-in-the-middle-of-a-flat-road-please-help/4075>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [September 25, 2017, 8:51pm UTC](https://community.pix4d.com/t/piles-of-points-pixels-in-the-middle-of-a-flat-road-please-help/4075 "2017-09-25T20:51:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Tom\_mirisola](https://avatars.discourse-cdn.com/v4/letter/t/67e7ee/32.png) [@Tom\_mirisola](https://community.pix4d.com/u/Tom_mirisola)\
**Post date:** [September 25, 2017, 8:51pm UTC](https://community.pix4d.com/t/piles-of-points-pixels-in-the-middle-of-a-flat-road-please-help/4075/1 "2017-09-25T20:51:20Z")

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I am having a huge issue with piles of points/pixels in the middle of flat roads. I have tried processing at 1/4 & 1/8 Image size with no difference found. I was flying 225’ single grid, 80%/80% overlap. With these mounds of points in my ray cloud I am unable to contour projects in AutoCad. Thank you for the help.&nbsp;

&nbsp;

Tom

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**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:** [September 26, 2017, 7:11am UTC](https://community.pix4d.com/t/piles-of-points-pixels-in-the-middle-of-a-flat-road-please-help/4075/2 "2017-09-26T07:11:14Z")

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Hi Tom,&nbsp;

This post, where you have added a comment, contains a lot of suggestions on how to improve a project with the issue you described:&nbsp;[https://community.pix4d.com/t/4415&nbsp;](https://community.pix4d.com/t/4415%C2%A0)

First, I would try to modify the minimum number of matches, this should already remove some noise:&nbsp;  
  
Then, the post cited above also mentioned that improving the image acquisition improved the results, e.g. by adding oblique images and by flying lower.&nbsp;

Adding Manual Tie Points (MTPs) can help as well:&nbsp;[https://support.pix4d.com/hc/en-us/articles/202560349&nbsp;](https://support.pix4d.com/hc/en-us/articles/202560349%C2%A0)

Or adding surfaces to smooth the DSM:&nbsp;[https://support.pix4d.com/hc/en-us/articles/202560449](https://support.pix4d.com/hc/en-us/articles/202560449)

Could you share screenshots of your project? if possible, also the quality report (click Process \> Generate Quality Report). This helps to understand the settings of the project.&nbsp;

Let us know if the suggestions above could improve the project.&nbsp;  
Cheers

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**Author:** ![Adam\_Jordan\_P.E](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/adam_jordan_p.e/32/220_2.png) [@Adam\_Jordan\_P.E](https://community.pix4d.com/u/Adam_Jordan_P.E)\
**Post date:** [September 26, 2017, 5:38pm UTC](https://community.pix4d.com/t/piles-of-points-pixels-in-the-middle-of-a-flat-road-please-help/4075/3 "2017-09-26T17:38:27Z")

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Tom, we really need to see more info to be specific in helping. &nbsp;Flying that high with only 80/80 overlap and 1/4 image size, well I am not surprised to see low resolution results with artifacts. &nbsp;Pix4D and drones are capable of so much more than the equivalent of a Google Maps view.