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T3RRA Cutta
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cutterjar 58036 9 Aerial crop photography either
Aerial crop photography
This is a small pivot irrigated field at the experiment
station where I work. I took this photo today from about
2000 ft. We am comparing color and infrared imagery from two
new Sony cameras we have. In this field you can see
experimental plots in soybeans (TL), cotton (TR), peanuts
(BR) and corn (BL).
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Re: Aerial crop photography
Here is the IR photo taken at the same time as the first.
See below for the camera setup.
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Re: Aerial crop photography
Here are the Sony digital cameras. Both have been specially
doctored to remove their internal IR filters. Filters are
added externally to selectively block certain wavelengths of
light. The camera with the darkest filter is the IR camera
in this case. As you can see our mount is pretty rudimentary
but it worked OK!
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Re: Aerial crop photography
Hi Stu,
The cameras seems Sony DSC-717 (or 707), it's right?
Can you to estimate Nitrogen deficience with this IR photos?

Flavio Gassen
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Re: Aerial crop photography
Hi Flavio. Yes they are 717's. Although they have been
altered to remove the IR blocking filter internally.

As for N deficiency measurements. Some people claim you can.
Perhaps it is so under some *very* tightly controlled and
well calibrated conditions. Personally I am not a great fan
of IR crop photography. I have not had good success with it
in the past. Part of that was the difficulty of dealing with
IR film. Maybe my work with these digital cameras will make
me a believer. Maybe not. I am a skeptic! We'll see....
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Re: Aerial crop photography
Ok,
So, why to take IR photos?

Flavio
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Re: Aerial crop photography
Really Interesting, I wonder how it would work here.
I used to have all sorts of special filters to control
light down almost to the nanometer. It was or a story on
film and how what the makers say the film is sensitve too is
not always accurate. The emulsion numbers of film had a lot
to do with it too.
Digital opens up a whole new relm to play with.
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Re: Aerial crop photography
Infrared images have properties that make them intriguing
for use in crop analysis. For instance, green plants are
known to reflect the infrared portion of the spectrum much
more strongly relative to soil and water bodies. The idea is
that healthy crop will reflect more strongly and thus stand
out more from other areas in an image scene. A google search
will quickly lead to more theoretical background.

Personally, I have certain issues with current use of IR
photography and hence am doing some work now to try and
address my reservations.
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Re: Aerial crop photography
This is a picture of my boss taking GPS measurements in the
above field for ground truthing purposes. The crop in this
quarter of the pivot is peanuts.
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Re: Aerial crop photography
Stu,
Now, I understood why you have agricultural research
enthusiasm. More important than cientific interest, is
friendly team of work. And you, really, have a nice boss.
You are a lucky guy.:-D
To forgive my funny commentary. Is her your wife?

Flavio
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Re: Aerial crop photography
Yes, as you have surmised my boss at work is also my boss at
home. ;-)
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