Effect of Reduced Spatial Resolution on Mineral Mapping Using Imaging Spectrometry - Examples Using Hyperspectral Infrared Imager (HyspIRI)-Simulated Data
Author
Kruse, Fred A.
Taranik, James V.
Coolbaugh, Mark
Michaels, Joshua
Littlefield, Elizabeth F.
Calvin, Wendy M.
Martini, Brigette A.
Date
2011Metadata
Show full item recordAbstract
The Hyperspectral Infrared Imager (HyspIRI) is a proposed NASA satellite
remote sensing system combining a visible to shortwave infrared (VSWIR) imaging
spectrometer with over 200 spectral bands between 0.38 and 2.5 μm and an 8-band thermal
infrared (TIR) multispectral imager, both at 60 m spatial resolution. Short Wave Infrared
(SWIR) (2.0â 2.5 μm) simulation results are described here using Airborne Visible/Infrared
Imaging Spectrometer (AVIRIS) data in preparation for the future launch. The simulated
data were used to assess the effect of the HyspIRI 60 m spatial resolution on the ability
to identify and map minerals at hydrothermally altered and geothermal areas. Mineral
maps produced using these data successfully detected and mapped a wide variety of
characteristic minerals, including jarosite, alunite, kaolinite, dickite, muscovite-illite,
montmorillonite, pyrophyllite, calcite, buddingtonite, and hydrothermal silica. Confusion
matrix analysis of the datasets showed overall classification accuracy ranging from 70 to
92% for the 60 m HyspIRI simulated data relative to 15 m spatial resolution data.
Classification accuracy was lower for similar minerals and smaller areas, which were not mapped well by the simulated 60 m HyspIRI data due to blending of similar signatures and
spectral mixing with adjacent pixels. The simulations demonstrate that HyspIRI SWIR
data, while somewhat limited by their relatively coarse spatial resolution, should still be
useful for mapping hydrothermal/geothermal systems, and for many other geologic
applications requiring mineral mapping.
Description
The article of record as published may be located at http://dx.doi.org/10.3390/rs3081584
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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