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Re: diferent results in program and envi [message #55094 is a reply to message #55093]

Wed, 01 August 2007 12:24

Jean H.
Messages: 472
Registered: July 2006

Senior Member

skymaxwell@gmail.com wrote:
> first question is closed ;)
> now it's works
>
> second question about getting pixel size in program still active :(
>
>
>
>> Second question, yes you are right
>> i define pixel size in my program from ENVI GUI
>> how get pixel size WITHOUT ENVI GUI ?

Well, if your image is georeferenced, you can do
pixSizeX = (max(coord X) - min(coord X)) / nb of Pixels in the X direction

...if your image is not georeferenced, you would have to find it by
other means... the best one is probably the metadata of your image /
sensor! ... otherwise, to ESTIMATE it, you would need to identify two
features on your image and you would have to know their exact coordinate
or at least the distance between the 2 features. ... then you need to
find the number of pixels in the X and Y direction between the two
features... make sure to consider fractions of pixels! ... and you apply
the same idea as if your image was georeferenced..

Hope that helps!

Jean

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[Message index]

		Re: diferent results in program and envi By: Jeff N. on Wed, 01 August 2007 13:05
		Re: diferent results in program and envi By: Jean H. on Wed, 01 August 2007 12:24
		Re: diferent results in program and envi By: skymaxwell@gmail.com on Wed, 01 August 2007 11:09
		Re: diferent results in program and envi By: skymaxwell@gmail.com on Wed, 01 August 2007 08:44
		Re: diferent results in program and envi By: Jeff N. on Wed, 01 August 2007 08:04

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