# Pix4D Mapper Multispectral Reflectance Map Issue

**URL:** <https://community.pix4d.com/t/pix4d-mapper-multispectral-reflectance-map-issue/29485>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [March 8, 2024, 9:20pm UTC](https://community.pix4d.com/t/pix4d-mapper-multispectral-reflectance-map-issue/29485 "2024-03-08T21:20:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![wing.ng](https://avatars.discourse-cdn.com/v4/letter/w/91b2a8/32.png) [@wing.ng](https://community.pix4d.com/u/wing.ng)\
**Post date:** [March 8, 2024, 9:20pm UTC](https://community.pix4d.com/t/pix4d-mapper-multispectral-reflectance-map-issue/29485/1 "2024-03-08T21:20:41Z")

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Hello there,

I have experienced some issue. When it comes to step 3 for generating a big reflectance map of a surveyed farm field under the Ag Multispectral template using Pix4D Mapper 4.9.0., an error message shows that “[Warning]: Failed to write Exif!” But I can generate the reflectance map for another field that next to it. Please find the log file of the project for your kind advice.

[Little Catsbury Multispectral.log](https://community.pix4d.com/uploads/short-url/oEEgZfU0u0WtTOkHUGdre7sCsdP.log) (3.4 MB)

Below are also my PC spec. for your information:

**|Processor|12th Gen Intel(R) Core™ i7-12650H 2.70 GHz|**  
**|Installed RAM|16.0 GB (15.7 GB usable)|**  
**|System type|64-bit operating system, x64-based processor|**  
**|Edition|Windows 11 Enterprise|**  
**|Version|23H2|**

Many thanks indeed.

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**Author:** ![Mike\_K](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/mike_k/32/4697_2.png) [@Mike\_K](https://community.pix4d.com/u/Mike_K)\
**Post date:** [April 4, 2024, 12:15pm UTC](https://community.pix4d.com/t/pix4d-mapper-multispectral-reflectance-map-issue/29485/2 "2024-04-04T12:15:42Z")

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Hi Wing,  
This is difficult to say exactly why it failed. The log file indicates that Mapper was unable to find a radiometric calibration target. So, if you used one Mapper did not detect it. You also have several uncalibrated captures. It also be related to a poorly acquired dataset. Can you attach the PDF quality report?