NDVI - USB Infragram Webcam

[Elisa Paola Arias Castro]

Hello

Morning

I wrote to you last week, because I had have some troubles trying to understand the NDVI. I already had a help I realized that I tooked the wrong pictures.

Last weekend I tooked the correct pictures and I Think I'll need your help again. We have a USB Infragram webcam , and we used all the options you have on analysis (About Infragrammar) on the website. we don't know exactly which the picture show the NDVI and how can we read?.

Thank you for your help.

Cordialmente

[Elisa Paola Arias Castro]

[Elisa Paola Arias Castro]

Hi

Someone can help me with that?? I really need your help.  I'm from Colombia and I haven't found enough information about NDVI, we need a light by the way.

I'll be gratefull if someone can help me.

Cordialmente

[Ned Horning]

Hi Elisa,
 
I took a look at one of your images (2015-04-04T18_21_37.147Z.jpg) and I don't think you will be able to use this for calculating NDVI. Is this what the image looked like originally or was this processed in some way? The problem with the image I looked at is that there is not much variation in the different bands of the photo. The histograms for each band are almost identical which is quite odd. This is the type of image I would expect if each of the sensor channels were recording a broad range of visible through near-infrared wavelengths. Are you certain there is a filter installed?

I haven't used an Infragram Webcam so perhaps someone who has one can write to provide information about using it that will be helpful.

If you can send me another image from the webcam without any processing I can look a little more carefully to see if I can figure out what the problem is.

All the best,

Ned

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[Elisa Paola Arias Castro]

Hi Morning

I'm wirtting to you because i worte to you sometimes with some question about NDVI, actually I have good information about it but isn't enough so we are trying to find more information about the pictures we already tooked and we processed using infragram, but we don't know yet if the pictures we have show the NDVI or if we have to take another one.

I'm thankful 

Cordialmente

---------- Forwarded message ----------
From: Elisa Paola Arias Castro <elisa...@sanolivar.co>
Date: 6 April 2015 at 11:18
Subject: NDVI - USB Infragram Webcam
To: plots-i...@googlegroups.com

[elisa...@sanolivar.co]

> ---------- Forwarded message
> ----------
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> From: Elisa Paola Arias Castro
> <elisa...@sanolivar.co>
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> Date: 10 April 2015 at 16:15
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> Subject: Fwd: NDVI - USB Infragram Webcam
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> To: plots-i...@googlegroups.com,
> Jeffrey Warren <je...@publiclab.org>
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> Morning
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> I wrote to you last week, because I had have
> some troubles trying to understand the NDVI. I
> already had a help I realized that I tooked the
> wrong pictures.
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> Last weekend I tooked the correct pictures
> and I Think I'll need your help again. We have
> a USB Infragram webcam , and
> we used all the options you have on analysis
> (About Infragrammar) on the website. we don't
> know exactly which the picture show the NDVI and
> how can we read?.
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> Thank you for your help.
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> --
>
> Post to this group at plots-i...@googlegroups.com
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>  
>
> Public Lab mailing lists (http://publiclab.org/lists)
> are great for discussion, but to get attribution, open source your
> work, and make it easy for others to find and cite your
> contributions, please publish your work at http://publiclab.org
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> You received this message because you are subscribed to the Google
> Groups "plots-infrared" group.
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Hi

Thx for your answer, so we are going to take more picture without any filter. And I'll like to know If I can get in touch with someone by skype because we are having more question and is good if we can count with your support.

Thank you