[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [APD] Aquatic-Plants Digest, Vol 31, Issue 19
In remote sensing and terrestrial agriculture, hyperspectral imagery as
well as laser induced fluorescence has been used as indicators of crop
health. The plants will demonstrate stress through the hyperspectral
signature . Using a single band, or color imagery it _might_ be possible,
but it may be difficult to control everything. For example, as we all know
water absorbs light very well, in many wavelengths. The content of the
water will also change those absorption bands, and that may lead a single
band measurement (eg IR) to vary even in the absence of plant
fluctuations. If you have a hyperspectral web cam, then I know algorithms
and tools could be developed. For single band, either IR or color, I doubt
that there will be enough information to allow for accurate determination
of plant stress before we can note it visually.
> 3. Webcam as plant health monitor? (Daniel Larsson)
>Date: Fri, 10 Mar 2006 14:44:51 +0100
>From: "Daniel Larsson" <defdac at hotmail_com>
>Subject: [APD] Webcam as plant health monitor?
>To: <aquatic-plants at actwin_com>
>I've made my webcam take one picture every ten
>minute and plot color values:
>Why? Don't know. Because I thought it was cool
>and perhaps the chart could somehow tell me when
>Well, I'm having trouble making anything useful out
>of the chart, but today I remembered my CoolPix
>4500 is sensitive to IR and that chlorophyll meters
>measure the amount of reflected IR-light from plants.
>I also found this article on how to make a webcam
>So I will be doing that as soon as possible.
>Now to my question - have onyone been taking
>IR-pictures of their planted tank and been able
>to see when the plants are "sad"?
>Daniel Larsson, Sweden
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com