# The mosaic and reflectance of Altum lwir had errors

**URL:** <https://community.pix4d.com/t/the-mosaic-and-reflectance-of-altum-lwir-had-errors/21017>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [January 11, 2022, 3:22am UTC](https://community.pix4d.com/t/the-mosaic-and-reflectance-of-altum-lwir-had-errors/21017 "2022-01-11T03:22:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![a78952123](https://avatars.discourse-cdn.com/v4/letter/a/e0b2c6/32.png) [@a78952123](https://community.pix4d.com/u/a78952123)\
**Post date:** [January 11, 2022, 3:22am UTC](https://community.pix4d.com/t/the-mosaic-and-reflectance-of-altum-lwir-had-errors/21017/1 "2022-01-11T03:22:22Z")

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Hi everyone,

After Micasense Altum data used Pix4dmapper, lwir’s mosaic and reflectance had errors, but there were no problems with other bands.  
It’s good to use other software about Altum’s lwir.  
Is there a problem with the Pix4dmapper?  
Having shot at the same location and using Pix4dmapper many times before, this is the first time this issue has occurred.  
Thank you

 ![orthomosaic_preview](https://global.discourse-cdn.com/pix4d/original/2X/9/940ddbf256c6dae1de703945a446322af843b89a.jpeg)

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**Author:** ![Kapil\_Khanal](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/kapil_khanal/32/304_2.png) [@Kapil\_Khanal](https://community.pix4d.com/u/Kapil_Khanal)\
**Post date:** [January 11, 2022, 7:55pm UTC](https://community.pix4d.com/t/the-mosaic-and-reflectance-of-altum-lwir-had-errors/21017/2 "2022-01-11T19:55:57Z")

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Hello @a78952123, As you know that the resolution of the thermal camera is very low so if you don’t have enough overlap for the thermal images this might occur. However, as your other bands look good, I would suggest you use a different rig processing option( _Optimize Relative Rotation_) and see if that helps to solve your issue. For more information visit,

> **[Processing camera rigs](https://support.pix4d.com/hc/en-us/articles/115005852003-Processing-camera-rigs)**
>
> So-called camera rigs are systems connecting several cameras by rigs. With one trigger command, referred as a capture, the system enables all the cameras connected in the rig to take images simulta...