| Re: How to avoid BSQ? [message #69285] |
Mon, 11 January 2010 11:42 |
jeffnettles4870
Messages: 111
Registered: October 2006
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Senior Member |
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On Jan 11, 1:37 pm, ivitseva <eva.ivits-was...@jrc.ec.europa.eu>
wrote:
> Please excuse my ignorance, but can somebody explain me the rules when
> and why Envi creates BSQ instead of BIL? In case I wanna avoid a BSQ,
> do I have to write an IDL script and define there that the outcome
> should be BIL? For instance, I've just done a simple addition of two
> integer BIL images, why is the outcome a BSQ file? Do I have to write
> a script each time I do these calculations? Thanks in advance, Eva.
It sounds like you're talking about ENVI's band math operations. For
speed reasons, the output of band math is always BSQ as far as I
know. Spectral math, though, always outputs BIL (or maybe BIP? can't
remember, but my recollection is that it's BIL). Sometimes you can use
spectral math in place of band math if what you're doing is basically
just applying a simple operation to every pixel in the image. For
your simple addition, for example, you should be able to substitute a
spectral math addition if you're adding all bands in both cubes. If
the operations you want to do get much more complicated than simple
addition or multiplication of two cubes, though, I think you'll end up
writing scripts if you want to control the interleave.
Jeff
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