NDVI and NRG

NDVI stands for "Normalized Difference Vegetation Index". NRG stands for "Near-infrared / Red / Green". NDVI and NRG are both ways to visualize the amounts of infrared and other wavelengths of light reflected from vegetation. Because both these methods compare ratios of blue and red light absorbed versus green and IR light reflected, they can be used to evaluate the health of vegetation. It's a snapshot of how much photosynthesis is happening. This is helpful in assessing vegetative health or stress. (Read more here: https://www.agronomy.org/publications/jeq/articles/36/3/832)

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NDVI difficulties with infrablue filter

by warren almost 6 years ago | 4 | 85 views | 0


Video NDVI

by cfastie almost 6 years ago | 2 | 139 views | 0


Bee Movie

by cfastie almost 6 years ago | 0 | 179 views | 0


Lots of sample Infragram images for testing

by warren about 6 years ago | 3 | 57 views | 0



Invisible Rays

by cfastie about 6 years ago | 4 | 306 views | 1


Middlebury Meetup

by cfastie about 6 years ago | 0 | 171 views | 2


Middlebury Meetup April 30

by cfastie about 6 years ago | 0 | 117 views | 0


DaffyCam

by cfastie about 6 years ago | 3 | 84 views | 1


Rosco!

by cfastie about 6 years ago | 9 | 562 views | 1


Superblue

by cfastie about 6 years ago | 31 | 2,644 views | 2


CrocusCam

by cfastie about 6 years ago | 3 | 114 views | 1


Sanm LeafKam

by cfastie about 6 years ago | 4 | 115 views | 1



Prototype Raspberry Pi-based dual IR cam

by warren over 6 years ago | 6 | 222 views | 1



Infrared camera test - film types

by cindy_excites over 6 years ago | 9 | 123 views | 0


Doing NDVI in one camera

by mathew over 6 years ago | 1 | 136 views | 0


Lincoln Peak Vineyard

by cfastie almost 7 years ago | 3 | 112 views | 0


Lee, NH PLOTS/FarmHack Meetup

by cfastie almost 7 years ago | 6 | 271 views | 0


NDVI out of the shadows

by cfastie about 7 years ago | 1 | 286 views | 0



Grassroots NDVI - time series

by cfastie about 7 years ago | 2 | 154 views | 0


Testing new false color gradients for NDVI

by warren about 8 years ago | 0 | 2,610 views | 0