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Re: Bits & Bytes [message #57896 is a reply to message #57895]

Tue, 08 January 2008 04:29

Ingo von Borstel
Messages: 54
Registered: September 2006

Member

Hi,
> I need to apply the status map on the NDVI data, because I need to
> flag cloud and snow pixels.

> From MSB to LSB

> Bit NR 7 (MSB): radiometric quality for B0 coded as 0 if bad and 1 if
> good
(...)

So, I assume you have a complete map where the single bytes contain
these data. In order to extract whether the n-th bit is set do something
along this line

icemap = (statusmap and 2^n) GE 1

The result will be a byte array which contains one, if the n-th bit is
set and 0 if it isn't set. I guess you want to use n=2

Regards,
Ingo

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Ingo von Borstel <newsgroups@planetmaker.de>
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[Message index]

		Re: Bits & Bytes By: jujo on Tue, 08 January 2008 05:37
		Re: Bits & Bytes By: wita on Tue, 08 January 2008 04:40
		Re: Bits & Bytes By: Ingo von Borstel on Tue, 08 January 2008 04:29

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