# P4 Multispectral radiometric corrections

**URL:** <https://community.pix4d.com/t/p4-multispectral-radiometric-corrections/13770>\
**Category:** PIX4Dmapper\
**Created:** [July 20, 2020, 5:14pm UTC](https://community.pix4d.com/t/p4-multispectral-radiometric-corrections/13770 "2020-07-20T17:14:51Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![andrew.freeland](https://avatars.discourse-cdn.com/v4/letter/a/94ad74/32.png) [@andrew.freeland](https://community.pix4d.com/u/andrew.freeland)\
**Post date:** [July 20, 2020, 5:14pm UTC](https://community.pix4d.com/t/p4-multispectral-radiometric-corrections/13770/1 "2020-07-20T17:14:51Z")

</div>

Aircraft: DJI P4 Multispectral (All Multispectral bands used)

When initial processing was complete I noticed that a sun\_angles.csv document was generated and contained sun angle and irradiance data for every .Tiff file. Can this document be used for radiometric corrections? If so, how? If not, what is the correct detailed workflow for corrections using the P4.

---

<div class="post-metadata">

**Author:** ![momtanu.chakraborty](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/momtanu.chakraborty/32/269_2.png) [@momtanu.chakraborty](https://community.pix4d.com/u/momtanu.chakraborty)\
**Post date:** [July 20, 2020, 7:24pm UTC](https://community.pix4d.com/t/p4-multispectral-radiometric-corrections/13770/2 "2020-07-20T19:24:29Z")

</div>

Andrew,

Pix4D does the radiometric correction with the light sensor data and the radiomertic target (if you have one). Pix4D writes the values to a csv file from the exif of the images. Pix4D reads the EXIF and uses these values to do the correction. We do not disclose the procedure/formula, however, you can have a look here: [https://support.pix4d.com/hc/en-us/articles/204894705-Camera-Requirements-for-Precision-Agriculture](https://support.pix4d.com/hc/en-us/articles/204894705-Camera-Requirements-for-Precision-Agriculture) and [https://support.pix4d.com/hc/en-us/articles/202559509-Radiometric-corrections](https://support.pix4d.com/hc/en-us/articles/202559509-Radiometric-corrections). The same workflow is followed for any multispectral camera to generate reflectance maps.