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Re: Select Images based on vector/shapefile/ROI [message #87990 is a reply to message #87903]

Mon, 10 March 2014 12:12

PMan
Messages: 61
Registered: January 2011

Member

On Monday, March 3, 2014 3:11:56 PM UTC-5, Sean Hartling wrote:
> Hi. I am working with MODIS data and I am attempting to find images (from several thousand) that encompass a specific geographic area (the state of Missouri). I was attempting to perform this using Layer Stack and Subset via ROI in ENVI. However, due to the fact that the images do not have a common geographic range, ENVI adds 0.0 data values (instead of NaN, which would be helpful) where it adds extent to each image to encompass the all the image ranges. These 0.0 values will affect my overall calculations when I attempt to pull average pixel values over the specific time period.
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> I would like to select images where the vector file for Missouri falls entirely within an image and omit images where it does not. Is there an IDL code, or other method) that would help facilitate this?
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> I appreciate any help. Thanks!

Envi allows "No data Values" I believe, set in the header file. If you set that (to say -1 or NAN), then do your resize, does this populate the extra data to the no data values? you might need to convert to ENVI format first.

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[Message index]

		Select Images based on vector/shapefile/ROI By: Sean Hartling on Mon, 03 March 2014 12:11
		Re: Select Images based on vector/shapefile/ROI By: Phillip Bitzer on Mon, 03 March 2014 17:31
		Re: Select Images based on vector/shapefile/ROI By: Sean Hartling on Mon, 10 March 2014 11:25
		Re: Select Images based on vector/shapefile/ROI By: PMan on Mon, 10 March 2014 12:12

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