Problem 843. Hyperspectral Processing: Determine Material Components given a Hyperspectral vector

Created by Richard Zapor

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Given a hyperspectral data set and Reflectance Spectral Signature Library determine a pixel's component percentages.<a href="http://aviris.jpl.nasa.gov/aviris/index.html">NASA AVIRIS</a>A Ground Square is imaged by hundreds of pixels, each at a different wavelength.
The signal on pixel 1(500nm to 505nm) is a sum of the components (Concrete/Tree/Grass...) by percentage of area covered times the material reflectance.
Pixel 2 (510-515nm) is different by the Reflectance deltas between Concrete and a Tree.Let S(i,j) be the response of Material i for band jg( j )= %(Concrete)*S(1,j)+%(Tree)*S(2,j)+...%(Grass)*S(end,j);A 300-Band 9-Material Spectral file is loaded. Comparison between foliage and rocks is quite significant. The materials are Bush, Calcite, Concrete, Conifer, Grass (not that type), Fir tree, Gypsum, Maple, Sageg=S*f where f is the percentage of the imaged pixel covered by the
material.Input: 
g spectral sum [301,1]; 
S spectral material response [301,9] Nine materialsOutput:
Solve for f ....( eg f=[0 .5 0 .25 .25 0 0 0 0]' )( f should sum to 1, max(f) is 1 and min(f) is 0 )The test Suite will round to 2 decimal places.
Cases of "other materials" which will induce negative values are not
tested.This is introductory and ignores atmospheric absorption.There is a matrix operation hint in the test suite for a method to solve for f.<a href="http://aviris.jpl.nasa.gov/data/free_data.html">AVARIS Free Data</a>
These data files are large with 224 bands x 750 channels x 2000 samplesTo expand these files may require a tar converter <a href="http://aviris.jpl.nasa.gov/alt_locator/111013_AV_Download.readme">NASA readme</a>
...and... <a href="http://aviris.jpl.nasa.gov/alt_gulf/">NASA Tools bottom Left</a>
There are some possible issues with the NASA tar tool. Two non-standard files can be found at <a href="http://dll-files.org/7968/index.html">libiconv-2.dll</a> and <a href="http://dll-files.org/7975/libintl-2.dll.html">libintl-2.dll</a>See the Test Suite for details on opening the AVIRIS Moffett Field file.

Given a hyperspectral data set and Reflectance Spectral Signature Library determine a pixel's component percentages.

<http://aviris.jpl.nasa.gov/aviris/index.html NASA AVIRIS>

A Ground Square is imaged by hundreds of pixels, each at a different wavelength.
The signal on pixel 1(500nm to 505nm) is a sum of the components (Concrete/Tree/Grass...) by percentage of area covered times the material reflectance.
Pixel 2 (510-515nm) is different by the Reflectance deltas between Concrete and a Tree.

Let S(i,j) be the response of Material i for band j

g( j )= %(Concrete)*S(1,j)+%(Tree)*S(2,j)+...%(Grass)*S(end,j);

A 300-Band 9-Material Spectral file is loaded. Comparison between foliage and rocks is quite significant. The materials are Bush, Calcite, Concrete, Conifer, Grass (not that type), Fir tree, Gypsum, Maple, Sage

*g=S*f*  where f is the percentage of the imaged pixel covered by the
material.

*Input:* 
g spectral sum [301,1]; 
S spectral material response [301,9]  Nine materials

*Output:*
Solve for f  ....( eg f=[0 .5 0 .25 .25 0 0 0 0]' )

( f should sum to 1, max(f) is 1 and min(f) is 0 )

The test Suite will round to 2 decimal places.
Cases of "other materials" which will induce negative values are not
tested.

This is introductory and ignores atmospheric absorption.

There is a matrix operation hint in the test suite for a method to solve for f.

<http://aviris.jpl.nasa.gov/data/free_data.html AVARIS Free Data>
These data files are large with 224 bands x 750 channels x 2000 samples

To expand these files may require a tar converter
<http://aviris.jpl.nasa.gov/alt_locator/111013_AV_Download.readme NASA readme>
...and... 
<http://aviris.jpl.nasa.gov/alt_gulf/ NASA Tools bottom Left>
There are some possible issues with the NASA tar tool. Two non-standard files can be found at <http://dll-files.org/7968/index.html libiconv-2.dll> and <http://dll-files.org/7975/libintl-2.dll.html libintl-2.dll>

See the Test Suite for details on opening the AVIRIS Moffett Field file.

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Last Solution submitted on Dec 24, 2014

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2 Comments

Alfonso Nieto-Castanon on 1 Feb 2013

links not working...

Alfonso Nieto-Castanon on 1 Feb 2013

also pretty impossible to hack, the testsuite produces errors before ever calling our function...

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Problem 843. Hyperspectral Processing: Determine Material Components given a Hyperspectral vector

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Problem 843. Hyperspectral Processing: Determine Material Components given a Hyperspectral vector

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