| Re: routine in ENVI to pass from EVF to ROI???? [message #49639 is a reply to message #49566] |
Thu, 03 August 2006 18:35  |
enod
Messages: 41
Registered: November 2004
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Member |
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I'm not sure whether you want to clip the image with a rectangle, or
with the exact polygon in SHP/EVF/ROI file.
If you just want a rectangle area that includes all the ROIs, why not
just read the coordinates of vertexes and get the maximum and minumum
values?
If you want to subset an image with ROIs, I would say you should create
a mask image based on ROIs first.
Cheers,
Tian
txominhermos@gmail.com wrote:
> To be clearer, I will say that I need to programmatically subset an
> image.
> I have found code* to create an image with the ROI information, but the
> problems is that it seems to be compulsory to create this image in IDL,
> with all the memory limitations problems that it has.
> I would like to use the ROI extension as parameter in the routine
> envi_output _to_external_format, or another similar one which allows me
> to make the image subset without collapse the RAM memory
>
>
>
>
> *
> http://groups.google.es/group/comp.lang.idl-pvwave/browse_th read/thread/9e5d6eb8b5bac80f/26a45d8b2ed7db26?lnk=gst&q= subset&rnum=2#26a45d8b2ed7db26
>
>
>
>
>
> txominhermos@gmail.com ha escrito:
>
>> MOre info:
>>
>> Basically I would like to do a subset, so finally I just need the max
>> and min X and Y coordinates.
>>
>>
>>
>>
>> txominhermos@gmail.com ha escrito:
>>
>>> Hello mates,
>>>
>>> I am trying but I am not able to find the ENVI routine to program the
>>> conversión from EVT to ROI (or the one to pass from SHP to EVF to
>>> ROI).
>>>
>>>
>>> Does it exit? or it is nor possible to do it by programming.
>>>
>>>
>>> Thanks for your attention.
>>>
>>>
>>>
>>>
>>> txo
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