Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p62b..07v&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P62B-07
Other
3672 Planetary Mineralogy And Petrology (5410), 5410 Composition, 5464 Remote Sensing, 5470 Surface Materials And Properties, 5494 Instruments And Techniques
Scientific paper
This study focuses on corroboration of remotely derived surface mineral maps based on thermal infrared (TIR = 7-14 microns) radiance measurements of field samples from Steamboat Springs, Nevada. Steamboat Springs is an active geothermal area with recent siliceous sinter deposits and a variety of exposed alteration minerals, including kaolinite, alunite, chalcedony and quartz. Wavelength-dependent reflection and absorption characteristics in the TIR range are diagnostic of most rock forming minerals, such as silicates, carbonates, and sulfates. Overlapping MASTER and SEBASS airborne TIR image data were acquired over Steamboat Springs in September 1999. The MASTER instrument has 10 channels in the TIR region and spatial resolution of 5 m, and SEBASS has 128 channels in the TIR and 2-m pixels. For each instrument, TIR emissivity spectra were extracted from atmospherically corrected radiance data and compared to field- and laboratory-measured emissivity spectra of samples collected from numerous sites within the scenes. Field sites were typically sampled over a 15x15 m2 area and spectral data from 5-10 samples at each site were averaged together to represent the area covered by a 3x3 pixel region in the MASTER image, and a 7x7 pixel region in the SEBASS image. Mineral maps were created by classifying image pixels based on matching known input spectra to unknown image spectra. MASTER and SEBASS both distinguish silica- and clay-rich areas. Minerals identified remotely generally agree with the dominant minerals identified in the lab. The best agreement occurs where the ground is warm and vegetation is sparse. Poor correlation between remote, field, and lab spectra occurs in areas that are shadowed or more densely vegetated. Hyperspectral TIR data show significant improvement over multispectral thermal imaging by distinguishing a wider variety of surface materials. Mineral maps will be presented along with spectral emissivity data acquired in the field as well as from samples measured in the laboratory.
Calvin Wendy M.
Hook Simon J.
Vaughan Greg R.
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