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Re: Reading individual bits of MODIS BRDF quality files [message #68072]

Mon, 21 September 2009 01:38

wita
Messages: 43
Registered: January 2005

Member

>
> Is there a function in IDL that can read individual bits, or any other
> clever way to produce an array of 1s and 0s from a 32-bit integer?

Hi Edward,

Compile the function below and run it trough ENVI Band math and it
will return an 0/1 map of the bit position that you specify. So for
retrieving
bit position 7 (integer value 128) use:

cgi_map_bitwise_flag(b1, 7)

with best regards,

Allard

FUNCTION cgi_map_bitwise_flag, statusmap, bitposition
return, BYTE((statusmap AND (2UL^bitposition))/(2UL^bitposition))
END

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[Message index]

		Re: Reading individual bits of MODIS BRDF quality files By: wita on Mon, 21 September 2009 01:38
		Re: Reading individual bits of MODIS BRDF quality files By: pgrigis on Fri, 18 September 2009 06:25
		Re: Reading individual bits of MODIS BRDF quality files By: emitchard on Fri, 18 September 2009 05:05
		Re: Reading individual bits of MODIS BRDF quality files By: Wout De Nolf on Fri, 18 September 2009 05:05

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