Thermal Emission Imaging System Atmospheric Correction

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Presentation transcript:

Thermal Emission Imaging System Atmospheric Correction Colin Ho ASU Mars Space Flight Facility Mentor: Phil Christensen

Overview Full atmospheric correction of Thermal Emission Imaging System IR stamps would provide a valuable source of spectral data that can be used for determining the Martian surface composition at a high resolution (100m/pixel) THEMIS visible stamp and TES mineral map resolution comparison image from JMARS

Objective To determine if atmospherically correcting Thermal Emission Imaging System (THEMIS) IR spectra using Thermal Emission Spectrometer (TES) data as a basis provides useful data Assumptions TES data is pure surface emissivity General atmospheric composition has little shift over time

Method Selecting an area Acquiring data Processing data Data access tools TES – vanilla THEMIS - THMPROC Processing data Programming tool davinci Using scripts such as i2i (Christensen) TES pixel outlined upon THEMIS stamp with MOLA in background Image from JMARS

Test Case Raw data comparison After processing using i2i Area of 44 to 44.25E, 2.75 to 3N used (day IR) Raw data comparison After processing using i2i

Test Case Results The derived atmospheric emissivity correlated to the expected atmospheric spectral dust emissivity Atmospheric dust emissivity (Smith, Bandfield, Christensen, 2000) Atmospheric emissivity derived from the difference between TES and THEMIS

Analysis In the initial test case, the results were found to be suitable for atmospheric correction purposes Plans for future improvement Using a larger temporal and spatial spread of data Applying multiple methods of determining emissivity difference Automating data retrieval, and processing

Acknowledgments Mentor Philip Christensen Special Thanks Kim Murray

Sources Smith, Bandfield, Christensen (2000), Separation of atmospheric and surface spectral features in Mars Global Surveyor Thermal Emission Spectrometer (TES) spectra, Journal of Geophysical Research. Vol 105. No E4. Pages 9589-9607 Bandfield (2002), Global mineral distributions on Mars, Journal of Geophysical Research, 10.1029/2001JE001510. Mars Global Data, http://jmars.asu.edu/data/ THMPROC, http://thmproc.mars.asu.edu/ davinci – Main Page. 6-25-07, “http://davinci.asu.edu/index.php/Main_Page” Arizona Space Grant Consortium logos. 8-28-08, http://spacegrant.arizona.edu/about/azsgc_logos