A new method to investigate hyperspectral image cubes: An application of the wavelet transform

被引:9
作者
Gendrin, Aline [1 ]
Langevin, Yves [1 ]
Bibring, Jean-Pierre [1 ]
Forni, Olivier [1 ]
机构
[1] Univ Paris 11, Inst Astrophys Spatiale, F-91405 Orsay, France
关键词
D O I
10.1029/2004JE002339
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Data analysis of the Observatoire pour la Mineralogie, l'Eau, les Glaces, et l'Activite ( OMEGA), the imaging spectrometer aboard Mars Express, necessitates the use of techniques able to extract the relevant information of large data sets. Numerous efficient algorithms have already been developed for similar purposes for terrestrial imaging spectrometers such as the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS). We propose here a complementary method based on the wavelet transform. Our algorithm allows the detection of the absorption bands in each spectrum and returns their position, width, and depth. We use it either to study separately the properties of each absorption band or as a classification method, grouping together the pixels whose spectra contain the same absorption bands. We test our algorithm on an AVIRIS observation of Mauna Kea, Hawaii. The method identifies the dominant mineralogy of this area: variability in the ferric and ferrous mineralogy and several types of phyllosilicates. We also study six Martian observation sessions acquired by the Infrared Spectrometer for Mars onboard Phobos 2. We identify ferric and ferrous absorption bands in the data set and variations in the ferrous mineralogy corresponding to different proportions of high and low calcium pyroxene. Finally, we apply our technique to the first 6 months of Mars surface observation by OMEGA/Mars Express, resampled on a 1 degrees x 1 degrees grid. We thus retrieve the global large-scale variability of the OMEGA data set and identify a global spectral discrepancy inside Martian dark regions which corresponds to the spectral difference between type I and type II terrains previously identified by the Thermal Emission Spectrometer.
引用
收藏
页数:21
相关论文
共 55 条
[1]   HYDROTHERMALLY ALTERED IMPACT MELT ROCK AND BRECCIA - CONTRIBUTIONS TO THE SOIL OF MARS [J].
ALLEN, CC ;
GOODING, JL ;
KEIL, K .
JOURNAL OF GEOPHYSICAL RESEARCH, 1982, 87 (NB12) :83-101
[2]   ALTERED BASALTIC GLASS - A TERRESTRIAL ANALOG TO THE SOIL OF MARS [J].
ALLEN, CC ;
GOODING, JL ;
JERCINOVIC, M ;
KEIL, K .
ICARUS, 1981, 45 (02) :347-369
[3]  
[Anonymous], 1997, A Wavelet Tour of Signal Processing
[4]   A global view of Martian surface compositions from MGS-TES [J].
Bandfield, JL ;
Hamilton, VE ;
Christensen, PR .
SCIENCE, 2000, 287 (5458) :1626-1630
[5]   Global mineral distributions on Mars [J].
Bandfield, JL .
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 2002, 107 (E6)
[6]  
Bibring J.- P., 2004, ESA SP
[7]   Mars surface diversity as revealed by the OMEGA/Mars Express observations [J].
Bibring, JP ;
Langevin, Y ;
Gendrin, A ;
Gondet, B ;
Poulet, F ;
Berthé, M ;
Soufflot, A ;
Arvidson, R ;
Mangold, N ;
Mustard, J ;
Drossart, P .
SCIENCE, 2005, 307 (5715) :1576-1581
[8]   RESULTS FROM THE ISM EXPERIMENT [J].
BIBRING, JP ;
COMBES, M ;
LANGEVIN, Y ;
SOUFFLOT, A ;
CARA, C ;
DROSSART, P ;
ENCRENAZ, T ;
ERARD, S ;
FORNI, O ;
GONDET, B ;
KSANFORMALITY, L ;
LELLOUCH, E ;
MASSON, P ;
MOROZ, V ;
ROCARD, F ;
ROSENQVIST, J ;
SOTIN, C .
NATURE, 1989, 341 (6243) :591-593
[9]   TOPOGRAPHY OF THE MARTIAN TROPICAL REGIONS WITH ISM [J].
BIBRING, JP ;
ERARD, S ;
GONDET, B ;
LANGEVIN, Y ;
SOUFFLOT, A ;
COMBES, M ;
CARA, C ;
DROSSART, P ;
ENCRENAZ, T ;
LELLOUCH, E ;
ROSENQVIST, J ;
MOROZ, VI ;
DYACHKOV, AV ;
GRYGORIEV, AV ;
HAVINSON, NG ;
KHATUNTSEV, IV ;
KISELEV, AV ;
KSANFOMALITY, LV ;
NIKOLSKY, YV ;
MASSON, D ;
FORNI, O ;
SOTIN, C .
PLANETARY AND SPACE SCIENCE, 1991, 39 (1-2) :225-236
[10]  
Boardman J. W., 1995, JPL PUBLICATION, V95-1, P23