# Distorted Ray Cloud and Uncalibrated Images

**URL:** <https://community.pix4d.com/t/distorted-ray-cloud-and-uncalibrated-images/24211>\
**Category:** PIX4Dmapper\
**Created:** [October 12, 2022, 1:30pm UTC](https://community.pix4d.com/t/distorted-ray-cloud-and-uncalibrated-images/24211 "2022-10-12T13:30:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![msmith](https://avatars.discourse-cdn.com/v4/letter/m/aca169/32.png) [@msmith](https://community.pix4d.com/u/msmith)\
**Post date:** [October 12, 2022, 1:30pm UTC](https://community.pix4d.com/t/distorted-ray-cloud-and-uncalibrated-images/24211/1 "2022-10-12T13:30:38Z")

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What causes this? I processed this file the other day and I did not have this problem. Unfortunately I accidentally did an overwrite on the old file so I dont have the data to refer back to…

 ![Pix4d Cloud.PNG](https://global.discourse-cdn.com/pix4d/original/2X/5/52f2c1fd93990ca3405cbdc0c878859c4c12971a.jpeg)  
[Dawn Rock\_report.pdf](https://community.pix4d.com/uploads/short-url/fWcWHWKXHGwNKZLCLvcRLf0GshL.pdf) (335.8 KB)

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**Author:** ![Rosana\_Lin](https://avatars.discourse-cdn.com/v4/letter/r/71e660/32.png) [@Rosana\_Lin](https://community.pix4d.com/u/Rosana_Lin)\
**Post date:** [October 25, 2022, 2:29am UTC](https://community.pix4d.com/t/distorted-ray-cloud-and-uncalibrated-images/24211/2 "2022-10-25T02:29:02Z")

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Hi @msmith

It’s good to see you back! 🙂

May I ask if the images were all taken at the same flight height?  
I also notice the **keypoints image scale** was set at 1/8.  
I would suggest **1/2 keypoints** image scale. However, it could be time-consuming as the dataset is quite large. If you would like to see if it works better with 1/2 keypoints image scale, feel free to try it first by halving the dataset or try with just a quarter of the dataset.

This article also provides information about the uncalibrated camera: [Initial Processing: Low number of calibrated images](https://support.pix4d.com/hc/en-us/articles/202560159-How-to-improve-the-outputs-of-dense-vegetation-areas-using-PIX4Dmapper##label1)

The last thing I noticed is that based on the flight path it seems like a free flight mission. If this is the case, you may also try setting the **Advanced: Matching Image Pairs** to _ **Free flight or terrestrial.** _ For more information on the free flight/terrestrial: [Menu Process \> Processing Options… \> 1. Initial Processing \> Matching](https://support.pix4d.com/hc/en-us/articles/205433155-Menu-Process-Processing-Options-1-Initial-Processing-Matching?source=search)

Sincerely,  
Rosana (she/her)