Planetary Science Institute
2007 Global MGS-TES Thermophysical Unit Maps
Supplementary to the 2007 Thermal Inertia Maps
This site contains downloadable unit maps derived from Mars Global Surveyor Thermal Emission Spectrometer observations of the surface of Mars taken over three Mars years from orbit 1583 to 24346. See note below for proper referencing.
The binary files available here contain maps of thermophysical units as delineated in albedo/thermal-inertia space. Units A, B, and C were chosen by encircling the modal peaks in a 2-D histogram of albedo and thermal inertia. Other units (D-G) represent portions of the remainder of the histogram as shown in Fig. A.3 of Putzig (2006). Two unit maps are provided, using the nightside and dayside maps of TES median apparent thermal inertia of Putzig and Mellon (2007). Both unit maps use the TES albedo map for Mars Year 26 created for use in the derivation of thermal inertia from TES observations.
NIGHTSIDE UNIT MAP (25 MB BINARY) DAYSIDE UNIT MAP (25 MB BINARY) Specifications:
- Map resolution is 20 pixels per degree.
- Map values range from 0 to 250, with 0 representing no-data locations and non-zero values corresponding to one of seven units. See the ASCII headers of the binary files for details.
- Data are from orbits 1583-24346, Feb 1999 (beginning of the mapping mission) to Apr 2004.
- Binary map format:
7200-byte ASCII header;
7200 x 3600 one-byte integer format (0 to 255, multiplier=1, offset=0);
created on a Mac Pro running Darwin (OS X 10.5.8) for those concerned with byte swapping.Example: If you are using IDL, you can read the binary files with these commands:
OPENR,1,'ANBunits2007.bin'
A = ASSOC(1,BYTARR(7200,3600),7200)
MAP = SWAP_ENDIAN(A[0],/SWAP_IF_BIG))Please cite the following article, in which the maps of thermal inertia and MY26 albedo appear:
Putzig, N. E., Mellon, M. T., 2007. Apparent thermal inertia and the surface heterogeneity of Mars, Icarus, 191, 68-94, doi: 10.1016/j.icarus.2007.05.013.
The nightside thermophysical unit map and histogram have been published as:
Fig. A.3 of Putzig, N. E., 2006. Thermal inertia and surface heterogeneity on Mars. PhD dissertation, University of Colorado, Boulder, Colorado, 195 pp. Full text PDF.
Fig. 18.12 of Mellon, M. T., Fergason, R. L., Putzig, N. E., 2008. The thermal inertia of the surface of Mars, Ch. 18 in Bell III, J. F., ed., 2008, The Martian Surface: Composition, Mineralogy, and Physical Properties, Cambridge University Press. ISBN: 9780521866989.
Contact:
Nathaniel E. Putzig
Planetary Science Institute
1546 Cole Blvd, Suite 120
Lakewood, CO 80401
nathaniel @ putzig.com
Tel: 720-549-8836