• Question: Can we use a color calibration reference card to calculate absolute values for DIY NDVI?

    warren is asking a question about multispectral-imaging: Subscribe to answer questions on this topic

    warren asked on October 27, 2017 20:18
    194 views | 1 answers | #15123


    As part of the Infragram project, folks across Public Lab are taking their own DIY multispectral photos to assess plant health. But this work is largely comparative -- since we're using modified consumer cameras, we don't usually know if they're more or less sensitive in one color channel vs. another.

    That means we compare imagery, but don't assume that we have an "absolute" measure of NDVI that we can compare across cameras, or in very different lighting conditions.

    Anyhow, I've seen some great work by @nedhorning trying to use a standard color reference calibration card to calculate the absolute NDVI, and enable comparisons across different cameras or lighting conditions. How does this work?



    1 Comments

    There's a fantastic amount of great information and guidance on this topic by @nedhorning at:

    #ndvi-calibrate

    Reply to this comment...


    Log in to comment