toa reflectance

Hallo,

I want to calculate the NDVI and it seems for me that I should convert the values of the 4 bands using the numbers in the band specific metadata. There are two numbers to convert DNs to TOA radiance radiometric scale factor which is a fixed no. (0.01) and reflectance coefficient which is not fixed. 

So, should I multiply by both or only use reflectance coefficient?

and what is the difference between analyticMS and analyticMS_SR images?

 

thanks,

Maged

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Comments

1 comment
  • Official comment

    Hi Maged,

     

    I believe what you are looking for is on page 29 of our product specs: https://assets.planet.com/docs/combined-imagery-product-spec-final-may-2019.pdf

     

     To convert the pixel values of the Analytic products to radiance, it is necessary to multiply the DN value by the
    radiometric scale factor, as follows:
    RAD(i) = DN(i) * radiometricScaleFactor(i), where radiometricScaleFactor(i) = 0.01

     

    I hope this helps. Please let me know if you have any further questions.

    Best Regards,

    Pooja

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