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Re: Exporting rasters from ArcMap 9.1 to ENVI 4.0 [message #56486 is a reply to message #56399]

Fri, 26 October 2007 03:32

Nuno Vilaça
Messages: 10
Registered: October 2007

Junior Member

On Oct 23, 6:25 pm, Jean H <jghas...@DELTHIS.ucalgary.ANDTHIS.ca>
wrote:
>> Jean,
>
>> i discovered that if i multiply my images for 100 that envi displays
>> them correctly... quite strange... between 0 and 1 he does not display
>> them, but between 0 and 100 he does... very weird...
>
> Hi,
>
> then it is just a visualization problem... if you have 255 levels of
> grey and ALL your values are between 0 and 1, you will not see much...
> so just apply a stretching algorithm when you display it, or define some
> color for each class, depending on your data.
>
> ArcGis, by default, stretch your data when you display it (that's why,
> if you display 2 DEM, they won't have the same color for the same
> elevation value...). Envi does not by default, and it is up to you to do it.
>
> Of course, this is valid only if you expected to have these values
> between 0 and 1, otherwise it is another problem!
>
> Jean

hi Jean!

i managed to solve the prob!
with band math, i multiply my image for 100 and then i can see
everything as i told you. still, when exporting for the software where
i want to use the images it doesn't work. with these images multiplied
by 100, i use the stretch data tool, i stretch the image from 0 to 200
and save it as a byte and then it works, pretty weird ah???
anyway thankl you for your help!
cheers!

nuno

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[Message index]

		Exporting rasters from ArcMap 9.1 to ENVI 4.0 By: Nuno Vilaça on Tue, 16 October 2007 05:39
		Re: Exporting rasters from ArcMap 9.1 to ENVI 4.0 By: Nuno Vilaça on Fri, 19 October 2007 05:00
		Re: Exporting rasters from ArcMap 9.1 to ENVI 4.0 By: Jean H. on Thu, 18 October 2007 08:47
		Re: Exporting rasters from ArcMap 9.1 to ENVI 4.0 By: Nuno Vilaça on Tue, 23 October 2007 00:57
		Re: Exporting rasters from ArcMap 9.1 to ENVI 4.0 By: Jean H. on Tue, 23 October 2007 09:25
		Re: Exporting rasters from ArcMap 9.1 to ENVI 4.0 By: Nuno Vilaça on Fri, 26 October 2007 03:32

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