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Multispectral Wheat by Chris Fastie

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About This Gigapan

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Taken by
Chris Fastie Chris Fastie
Explore score
1
Print Pricing
$4.00 to $607.00
Size
0.52 Gigapixels
Views
1542
Date added
May 30, 2013
Date taken
May 18, 2013
Gear

Canon Powershot A495

Categories
environmental, experimental
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Description

A field trial of seven types of wheat at Tuckaway Farm in New Hampshire. The upper three images were made with a two-camera infrared rig flying close over the field. A camera modified to record only infrared light was the source of the near infrared information in the false color infrared (NRG) and normalized difference vegetation index (NDVI) images. The NRG image displays near infrared, red, and green as RGB. NDVI was computed as (NIR-blue)/(NIR+blue).

The lower three images were made with a single-camera rig flying high over the field. A blue filter (infrablue) which blocks most red light allowed the red channel in that camera to record mostly near-infrared light (the IR cut filter had been removed). That channel was the source of near-infrared information in the multispectral images. The false color infrared image displays near infrared, blue, and green as RGB. NDVI was computed as (NIR-blue)/(NIR+blue).

The dual camera rig was two Powershot A495s triggered synchronously by a modified MK111 timer. One A495 had a Wratten 87 filter replacing the IR cut filter. The single camera was a Powershot A810 with no IR cut filter and a piece of Rosco #2007 Blue polyester filter in front of the lens.


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