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Re: help with reading unsigned 16-bit integers [message #57470 is a reply to message #57453]

Sun, 09 December 2007 06:59

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

dcleon@gmail.com writes:

> Try using ISHFT to create a mask that you will use to determine (by
> using a bitwise AND) if/where given bits are set:
> Taking your example for the 2-'cloud' bit:
>> cloudmask = ISHFT(1,2)
>> cloudy = FEATURE_CLASSIFICATION_FLAGS AND cloudmask
> The resulting "CLOUDY" variable will be nonzero where the 2-'cloud'
> bit is set.
> combine with other bits as needed.

Here is an article that might give you some help with
how to use ISHFT:

http://www.dfanning.com/code_tips/convert24to8.html

This is essentially what you want to do with your
value.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: help with reading unsigned 16-bit integers By: teich on Sun, 09 December 2007 12:57
		Re: help with reading unsigned 16-bit integers By: David Fanning on Sun, 09 December 2007 12:46
		Re: help with reading unsigned 16-bit integers By: teich on Sun, 09 December 2007 12:12
		Re: help with reading unsigned 16-bit integers By: David Fanning on Sun, 09 December 2007 06:59
		Re: help with reading unsigned 16-bit integers By: dcleon@gmail.com on Sun, 09 December 2007 01:37

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