Satellite Calibration

With the large constellation of doves that Planet has, calibration to surface reflectance is a daunting task, and I'm trying to validate the imagery I'm using, particularly when you have many different satellites looking at a given location across an extended period of time.

https://www.planet.com/products/satellite-imagery/files/1611.09_Spec_Sheet_Combined_Imagery_Product_Letter_DraftV3.pdf

Reading the above document, in section 6.4.1, it mentions "This is achieved through a vigorous sensor calibration concept that is based on lab calibration, regular checks of the statistics from all incoming image data, acquisitions over selected temporal calibration sites, and absolute ground calibration campaigns."

While I'm sure you can't share everything, would it be as least possible to share the locations of these temporal calibration sites and/or the methodology of the absolute ground calibration campaigns?

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Comments

5 comments
  • Hi Kevin,

    The document that you referred is very old.

    Please download the recent image specification document from here  and look in section 8.4

    Thank you.

     

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  • Hey Emir,

    This is exactly what I was looking for, I'm glad to see that the description of the calibration has improved tremendously compared to that other document.

    Thanks,

    -Kevin Kha

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  • Actually, I was wondering how did you find the old document? So I can report this and make sure everyone in the community only have access to the recent documentation ;) 

    Thank you for your help.

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  • Sure thing, there are probably quite a few ways to get to it, but I got to it by googling 'planet dove bands', and it appears as the second link. There are probably many different keywords that can be stringed together to pull up this older document that I'm sure others are referencing.

    Until just now, I didn't realize that the Planet Developer Center contained the document you shared with me. Maybe its something I missed, or you guys updated over time, but it would be great if you could increase awareness for updates to avoid any confusion like we are now. Just an opinion!

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  • Thank you for your feedback. In the meantime, I would suggest you to bookmarked this page: https://support.planet.com/hc/en-us/categories/360001160454-White-Papers-Guides 

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