# How to radiometric calibration of sequoia image using Spectralon Reference Panel in Pix4Dmapper? **URL:** \ **Category:** PIX4Dmapper Questions/Troubleshooting\ **Created:** [October 25, 2018, 7:36am UTC](https://community.pix4d.com/t/how-to-radiometric-calibration-of-sequoia-image-using-spectralon-reference-panel-in-pix4dmapper/7438 "2018-10-25T07:36:15Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![kyong\_kim](https://avatars.discourse-cdn.com/v4/letter/k/d6d6ee/32.png) [@kyong\_kim](https://community.pix4d.com/u/kyong_kim)\ **Post date:** [October 25, 2018, 7:36am UTC](https://community.pix4d.com/t/how-to-radiometric-calibration-of-sequoia-image-using-spectralon-reference-panel-in-pix4dmapper/7438/1 "2018-10-25T07:36:15Z")
Hello. I have Spectralon Reference Panel.  ([https://discover.asdi.com/bid/63748/Top-Tip-Caring-for-your-Spectralon-Reference-Panel-in-the-Field](https://discover.asdi.com/bid/63748/Top-Tip-Caring-for-your-Spectralon-Reference-Panel-in-the-Field)) Can I use radiometic calibration of sequoia in Pix4Dmapper?     ---
**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:** [October 29, 2018, 10:43pm UTC](https://community.pix4d.com/t/how-to-radiometric-calibration-of-sequoia-image-using-spectralon-reference-panel-in-pix4dmapper/7438/2 "2018-10-29T22:43:30Z")
Hi Kyong, Even though the targets will not be recognized automatically they can be used with our software. The only criteria for using a reflectance panel is that they should have a Lambertian surface so that they are reliable for our radiometric correction algorithms. You will need to enter the panel images and reflectance factors manually.