| mosaic_doit [message #29417] |
Thu, 14 February 2002 05:57  |
Cinthia Loial
Messages: 4
Registered: September 1996
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Junior Member |
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Hi all,
I have georeferenced properly 2 images I need to mosaic.
I can mosaic them with ENVI
but programming with IDL, mosaic_doit returns:
Envi retrieve data: An error has occured during processing.
Error: "Subscript range values of the form low:high must be >= 0, with
low<= high: A."
The result may be invalid.
Indeed the result is invalid when I okay this warning.
Any suggestions?
Cinthia
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| Re: mosaic_doit [message #56576 is a reply to message #29417] |
Fri, 26 October 2007 10:45  |
d.poreh
Messages: 406
Registered: October 2007
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Senior Member |
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On Oct 26, 6:00 pm, Jean H <jghas...@DELTHIS.ucalgary.ANDTHIS.ca>
wrote:
> d.po...@gmail.com wrote:
>> Hi folks,
>> I am mosaicking 90 landsate ETM+ data(.tiff). I want to understand
>> if it is possible we read this amount of data and put all together to
>> get a big . tiff by using mosaic_doit in the for loop or not??
>> Cheers
>> Dav
>
> well, only you can tell this...
>
> requiredMemory = Xsize * Ysize * nb images * nb of bits in your data type
> This will give you the minimum required memory... you likely need some
> more do actually perform the mosaicking..
> then run memTest to find out if you have enough memory or not.
>
> Jean
Hi ;
Jean! thanks for your reply. Yes I test my machine and I have 4GB ram
and memTest shows that I can use this machine for my process. Just I
want to use 3 band and of course all LANDSAT ETM+ data are 8 bits.
Well what I shall do now? What is your propose to read this data and
can I use mosaic_doit in a for loop to add each time a new image to my
mosaic?
Cheers
Dav
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| Re: mosaic_doit [message #56577 is a reply to message #29417] |
Fri, 26 October 2007 10:33 |
David Streutker
Messages: 34
Registered: June 2005
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Member |
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On Oct 26, 10:00 am, Jean H <jghas...@DELTHIS.ucalgary.ANDTHIS.ca>
wrote:
> d.po...@gmail.com wrote:
>> Hi folks,
>> I am mosaicking 90 landsate ETM+ data(.tiff). I want to understand
>> if it is possible we read this amount of data and put all together to
>> get a big . tiff by using mosaic_doit in the for loop or not??
>> Cheers
>> Dav
>
> well, only you can tell this...
>
> requiredMemory = Xsize * Ysize * nb images * nb of bits in your data type
> This will give you the minimum required memory... you likely need some
> more do actually perform the mosaicking..
> then run memTest to find out if you have enough memory or not.
>
> Jean
I think it should be possible. I don't think the entire image needs
to be read into memory--ENVI seems to be able to handle memory issues
fairly intelligently. For instance, I've created a 4GB mosaic from
80+ tiles in Windows with only 3GB of RAM.
-David
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| Re: mosaic_doit [message #56579 is a reply to message #29417] |
Fri, 26 October 2007 09:00 |
Jean H.
Messages: 472
Registered: July 2006
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Senior Member |
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d.poreh@gmail.com wrote:
> Hi folks,
> I am mosaicking 90 landsate ETM+ data(.tiff). I want to understand
> if it is possible we read this amount of data and put all together to
> get a big . tiff by using mosaic_doit in the for loop or not??
> Cheers
> Dav
well, only you can tell this...
requiredMemory = Xsize * Ysize * nb images * nb of bits in your data type
This will give you the minimum required memory... you likely need some
more do actually perform the mosaicking..
then run memTest to find out if you have enough memory or not.
Jean
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