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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Notes tagged with ndvi

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Artichoke filter search

by cfastie over 5 years ago | 0 | 2,831 | 0

Mathew captured the same photo of artichoke plants with several different blue Rosco filters in f...

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Super Redstone

by cfastie over 4 years ago | 3 | 3,434 | 3

I took a new super-red Infragram camera for a test flight yesterday over a field that was scarred...

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iFarm Big Picture

by cfastie over 5 years ago | 0 | 4,774 | 1

Image above: All the iFarm participants graciously made Hay Angels for the kite borne camera,...

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Silvopasture

by cfastie over 5 years ago | 0 | 4,345 | 1

Image above: New England cottontail habitat created by clearcutting forest along a stream....

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Multigrain NDVI

by cfastie over 5 years ago | 3 | 5,901 | 2

Image above: Wheat seedlings from above in normal color (RGB), false color infrared (NRG), an...

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The KAPtober Collection

by cfastie almost 4 years ago | 1 | 4,294 | 5

This weekend I hosted some family in Vermont and we combined leaf peeping with kite photography. ...

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LEAFFEST aerials

by cfastie about 4 years ago | 1 | 3,143 | 3

*Image above: Teddy and the Iris with the radio remote transmitter (bottom center), and his lapto...

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Big NDVI

by cfastie about 5 years ago | 3 | 2,455 | 2

Image above: The Canon A810 infrablue camera on Bonanza Bluff. The infrablue panorama ...

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Rock Tripe Slab

by cfastie over 5 years ago | 0 | 2,192 | 0

Image above: Rock tripe (Umbilicaria sp.) and other foliose and crustose lichens cover a tent...

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2 cameras or not 2 cameras

by cfastie over 5 years ago | 2 | 4,651 | 2

Image above: Aerial photos from two kite flights over a young wheat field. Background image ...

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Stitched panoramas from the PLOTS IR camera tool

by cfastie over 6 years ago | 8 | 5,647 | 0

There was not enough wind for a kite to lift my <a href="http://publiclaboratory.org/wiki/dual-ca...

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Multispectral DeFelice

by cfastie over 5 years ago | 4 | 3,178 | 1

Image above: NDVI image of part of the front yard at the LUMCON DeFelice Marine Center in Coc...

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Agricultural mapping

by cfastie almost 6 years ago | 0 | 7,609 | 2

NDVI image of part of the Lee, NH cover crop field trial we mapped by balloon in May, 2012. F...

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NDVI output

by cfastie almost 6 years ago | 2 | 29,803 | 2

Three new color tables made by Ned Horning to present NDVI values as color images. Ned ...

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Prototype: filter map tiles in real-time in a browser with ImageSequencer (NDVI Landsat)

by warren 5 months ago | 7 | 464 | 1

I've been working with the new Image Sequencer, a Public Lab project, to try ...

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NGB NDVI Video Optimization (Red/Blue Manual Gain Control)

by MaggPi about 2 months ago | 0 | 292 | 1

Introduction: This project demonstrates the impact of different Raspberry Pi camera gain se...

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Use Image Sequencer for NDVI plant analysis with a modified mini sport camera

by warren about 2 months ago | 0 | 119 | 0

This tutorial shows how to use Image Sequencer to take a...

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NDVI microscopy

by MaggPi 2 months ago | 10 | 159 | 1

My first use of image-sequencer https://publiclab.github.io/image-sequencer/examples/#steps= ...

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Public Lab partnership with NASA AREN project brings new easy-to-use tools for classroom use

by warren 2 months ago | 0 | 509 | 2

Since 2011, Public Lab community members around the world have been building an...

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computer vision color detection

by MaggPi 3 months ago | 0 | 144 | 1

Introduction: Several digital camera applications such as spectroscopy or Normalized Differen...

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Use Image Sequencer for NDVI plant analysis with 2 images

by warren 4 months ago | 7 | 332 | 2

This tutorial shows how to use Image Sequencer to take two DIY multispectral ...

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NDVI workshop - Barcelona

by imvec 4 months ago | 3 | 210 | 1

Introduce the assistants to the main concepts around NDVI and plant health monitoring, camera h...

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Red vs. blue filters for NDVI

by nedhorning almost 5 years ago | 32 | 15,735 | 6

While working on [calibration techniques](http://publiclab.org/notes/nedhorning/10-21-2013/calibr...

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Hacked Infragram Raspberry Pi camera now on the International Space Station

by warren 6 months ago | 3 | 539 | 2

_(Reposted from the [Rosco company blog](http://www.rosco.com/spectrum/index.php/2018/03/rosco-fi...

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