| 04 Nov 2013 02:43 AM |
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hello
i'd like to make a code for a landsat 8 image file to know the percentage of each material in the image . i read and find that sub-pixel is the best way . but i don't know how can i start ???
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MariM
Veteran Member
Posts:2396  
| 05 Nov 2013 01:53 PM |
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ENVI has tools that will perform unmixing to provide an estimate of the percentage of each material in the scene. If you have access to ENVI, you can use UNMIX_DOIT to perform this type of anlaysis.
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Deleted User
New Member
Posts: 
| 06 Nov 2013 03:52 AM |
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hello Mariam ,
Thank you for your advise . but i don't understand what is the importance of the asci file in the procedure (envi isn't clear in this point) and how can i get it . if i am working on landsat 8??
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MariM
Veteran Member
Posts:2396
| 06 Nov 2013 10:52 AM |
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The sample program just shows how one might read in spectra from an ascii file. If your data are already in a spectral library, then the data could be read into a variable called ENDMEM and used in the tool. The array needs to take the form described in the help:
ENDMEM
Use this keyword to specify an array of floating-point values representing the endmember to unmix with. This array must already be resampled to the correct wavelength for the data. The dimensions of ENDMEM are [num_bands, num_endmembers].
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