How to convert the raw hyperspectral image (hawaii or yellowstone)into .mat file?
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Shrish Bajpai
on 9 May 2019
Commented: Walter Roberson
on 10 May 2019
I have raw images which I has taken from the link
I need to convert this raw files to .mat file through the matlab, so that I can get the image band by band
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Accepted Answer
Walter Roberson
on 9 May 2019
X = multibandread('hawaii_sc01.raw', [512, 614, 224], '*uint16', 0, 'bip', 'ieee-be');
The datatype is uint16 but the data is 12 bit, so the used portion is theoretically 0 to 4095 but in practice the range is 82 to 1006, so call it [0 1023]
According to the README, that particular file is the above size, and the maine file below it is a different size also 12 bit, and all of the rest of the files are 512 lines x 680 samples x 224 bands, instrument bit depth = 16 bits which would correspond to
X = multibandread(filename, [512, 680, 224], '*uint16', 0, 'bip', 'ieee-be');
You would have to examine the values to see what the actual data range is.
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Walter Roberson
on 10 May 2019
filename = 'aviris_sc0.raw';
X = multibandread(filename, [512, 680, 224], '*uint16', 0, 'bip', 'ieee-be');
X100 = fliplr(X(:,:,100));
imshow(X100,[])
Now compare to the first false-color image at https://coding.jpl.nasa.gov/hyperspectral/falsecolor.html and it will be obvious that the data has been extracted in the right order.
More Answers (1)
Shrish Bajpai
on 10 May 2019
1 Comment
Walter Roberson
on 10 May 2019
Earlier I posted
X = multibandread('hawaii_sc01.raw', [512, 614, 224], '*uint16', 0, 'bip', 'ieee-be');
Before I posted that I tested it and compared it to the sample images that they provided, so I was sure that the data was read properly.
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