
This data set contains 26,500 spectra, each described by reflectance values at 227 wavelengths from 1.1 to 2.6 μm. The spectra were obtained from a CRISM image of Nili Fossae on Mars (id: frt00003e12). 17 of the 26,500 spectra contain evidence of magnesite, a carbonate. The discovery problem posed by this data is: how quickly is magnesite discovered, given no prior knowledge?
To reduce noise and data set size, without losing important details, we first performed a superpixel segmentation on the original pixels to obtain 26,500 homogeneous segments, each represented by its mean spectrum, and then used a median filter to remove shot noise.
The data set is provided as a .mat file. Once loaded into Matlab, the following variables will be available:
Download: crism_data_sortsc1new.mat (23 MB)
Attribution: If you use this data set in your own work, please cite the CRISM scene id (frt0003e12). If you use the labels, please cite this paper:
Kiri L. Wagstaff, Nina L. Lanza, David R. Thompson, Thomas G. Dietterich, and Martha S. Gilmore. "Guiding scientific discovery with explanations using DEMUD." Proceedings of the TwentySeventh Conference on Artificial Intelligence (AAAI13), 2013.
Note: due to a file server crash, this data set differs very slightly from that described in our AAAI 2013 paper. However, it should be very, very similar and present the same challenge for magnesite discovery.
This data set contains 110 laboratory spectra, each described by emission values at 6143 wavelengths from 224 to 932 nm. There are eight rock types comprising 22 samples represented by 5 spectra each.
The data set is provided as a .mat file. Once loaded into Matlab, the following variables will be available:
Download: libs_data_sortnew.mat (3 MB)
Attribution: If you use this data set in your own work, please cite this paper:
Lanza, N.L., Wiens, R.C., Clegg, S.M., Ollila, A.M., Humphries, S.D., Newsom, H.E., Barefield, J.E., and the ChemCam Team. "Calibrating the ChemCam laserinduced breakdown spectrosopy instrument for carbonate minerals on Mars." Applied Optics, 49 (13), C211C217, 2010.