NSSDCA ID: PSPG-00789
Availability: Archived at NSSDC, accessible from elsewhere
This description was generated automatically using input from the Planetary Data System.
Data Set Overview ================= This data set consists of Thermal Inertia maps derived using Mars Global Surveyor Thermal Emission Spectrometer thermal bolometer temperature observations taken over three Mars-years from orbit 1583 to 24346 (note that in this context orbit refers to the TES specific Orbit Counter Keeper (OCK)), from February 1999 (beginning of mapping mission) to April 2004.Maps use only nightside or dayside data with surface temperatures between 160 and 400 K. Nightside (southbound) and dayside (northbound) maps are included and each has been infilled between 87 degrees south and 87 degrees north latitude. The derived range is 5 to 5000 J/(m^2*K*sqrt(s)). Higher and lower values are not computed. An interpolation mask is provided for each map, which identifies those pixels where the map has been infilled by interpolation (less than 8% in each case). If the interpolated pixels are not desired, they can be removed by multiplying the thermal inertia map by the associated interpolation mask. Browse color images including scale bars are available in JPEG format for nightside and dayside thermal inertia maps. Large (approximately 3.3 Mb) and small (approximately 0.15 Mb) versions are included. Processing ========== The processing of this data set was carried out by Nathaniel E. Putzig, currently at the Southwest Research Institute, and Michael T. Mellon, currently at the University of Colorado in Boulder. The processing to convert TES bolometer temperature observations to thermal inertia has been described in detail elsewhere. See the papers by Putzig and Mellon (2007) and Putzig et al. (2005) listed in ref.cat for more information. Note that the MGS-TES published bolometric thermal inertia was not used to derive these maps. The thermal inertia model that was used to calculate and populate the MGS-TES Bolometer tables is different than that used here, and querying the thermal inertia data (i.e. from published CDs or from http://tes.asu.edu/data_tool/index.php) will not reproduce the maps in this dataset. Data ==== This data set comprises several images that include: (1) Thermal Inertia Maps (2) Interpolation Masks (3) Browse JPEGs (1) Thermal Inertia Maps These images contain thermal inertia values derived from MGS TES thermal bolometer temperature observations taken over three Mars-years from orbit 1583 to 24346, from February 1999 (beginning of mapping mission) to April 2004. Maps use only nightside or dayside data with surface temperatures between 160 and 400 K. Nightside (southbound) and dayside (northbound) maps are included and each has been infilled between 87 degrees south and 87 degrees north latitude. The derived range is 5 to 5000 J/(m^2*K*sqrt(s)). Higher and lower values are not computed. Map resolution is 20 pixels per degree. Dayside and nigthside images are denoted in filenames by 'day' and 'night,' respectively. '2007' denotes the year in which these maps were published. (2) Interpolation Masks An interpolation mask is provided for each map, which identifies those pixels where the map has been infilled by interpolation (less than 8% in each case). If the interpolated pixels are not desired, they can be removed by multiplying the thermal inertia map by the associated interpolation mask. There is one interpolation mask each for both the nightside and dayside thermal inertia maps. The resolution of the interpolation masks is 20 pixels per degree. Interpolation masks are denoted in filenames by 'msk.' (3) Browse JPEGs The browse JPEGs consist of colorized representations of the thermal inertia maps. A large (approximately 3.3 Mb) and small (approximately 0.15 Mb) version is available for both nightside and dayside thermal inertia maps. A scale bar to roughly interpret the value of thermal inertia based on color is included on each browse JPEG. Units for the browse images are tiu (tiu = J/(m^2*K*sqrt(s)) ). In filenames 'd' denotes dayside maps, 'n' denotes nightside maps, 'b' stands for bolometer, and 's' stands for small. See the papers by Putzig and Mellon (2007) and Putzig et al. (2005) listed in ref.cat for more information on the data products included in this data set. Coordinate System ================= Mars Planetocentric referenced to the IAU_1991 ellipsoid, east positive; Mars is assumed to be a sphere with radius 3396.0 km. All images in this data set cover a latitude range of 90 to -90 degrees north and a longitude range of -180 to 180 degrees east. Images are centered at 0 degrees north and 0 degrees east. Media/Format ============ This data set is available electronically via the PDS Geosciences Node web site at http://pds-geosciences.wustl.edu. Formats are be based on the standards established by the Planetary Data System (PDS). These data are available on-line from the Planetary Data System (PDS) at: http://pds-geosciences.wustl.edu/GEO/mgs-m-tes-5-timap-v1/mgst_9001/
Questions and comments about this data collection can be directed to: Dr. David R. Williams
Name | Role | Original Affiliation | |
---|---|---|---|
Prof. Philip R. Christensen | Data Provider | Arizona State University | phil@elspeth.la.asu.edu |
Dr. Nathaniel E. Putzig | General Contact | Southwest Research Institute | nathaniel@putzig.com |