DN Value extraction - NV5 Geospatial - Help Forums

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Last Post 27 Nov 2012 04:39 PM by anon

DN Value extraction

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anon

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27 Nov 2012 04:39 PM
Hi, I am a new user to Envi 5.0. I am using L1b 250m modis imagery, and I have multiple layers from many days image I have projected on envi. My question is how do I extract data values from a ROI (river) from all the layers in envi? I have the shape file which outline the river I just need to how to extract all the data values from all the layers at once to view DN change ( ie. over different days)?

Deleted User

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28 Nov 2012 08:25 AM
If you get the ROI Statistics you'll see the number and distribution of the DN values within each ROI

Deleted User

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28 Nov 2012 09:13 AM
HI, Thank You! I have done that. But I have over 30 images with the same ROI for a entire decade. Is there anyway I can extract multiple DN values from all the layers (in a one year ie 30 images) in the same ROI at once?

Deleted User

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29 Nov 2012 10:18 AM
You could use 'layer stacking to stack the 30 images together or you could write a program using the ENVI_STATS_DOIT routine and apply that to each file.

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