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Re: Designating values to different ROIs in a single ROI file [message #68460]

Thu, 22 October 2009 06:11

penteado
Messages: 866
Registered: February 2018

Senior Member
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On Oct 22, 4:02 am, David Hsu <wwwdavi...@gmail.com> wrote:
> I found out that ENVI_ROI_TO_IMAGE_DOIT can do exactly what I need.
> But the problem is that the CLASS_VALUES variable seems only accept
> values up to 255, which is a data type of BYTE. But ENVI Help tells me
> it is an array of 'LONG INTEGERS'. I need at least INTEGER to store my
> population data.
>
> Has any idea about this problem?

That is not a problem, if you have less than 256 ROIs. Make an image
where the pixel value is the index of the ROI, then make a new one of
the type you need, where you replace the indexes by the populations of
the corresponding ROIs, which you can do with where or histogram.

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		Re: Designating values to different ROIs in a single ROI file By: penteado on Thu, 22 October 2009 06:11
		Re: Designating values to different ROIs in a single ROI file By: David Hsu on Wed, 21 October 2009 23:02

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