Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p32b..08b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P32B-08
Other
5400 Planetary Sciences: Solid Surface Planets, 5464 Remote Sensing, 5470 Surface Materials And Properties, 5494 Instruments And Techniques
Scientific paper
The Mars Color Imager (MARCI) on the Mars Reconnaissance Orbiter (MRO) spacecraft is a is a wide-angle, multispectral Charge-Coupled Device (CCD) "push-frame" imaging camera designed to provide frequent, synoptic-scale imaging of Martian atmospheric and surface features and phenomena. MARCI uses a 1024x1024 pixel interline transfer CCD detector that has seven narrowband interference filters bonded directly to the CCD. Five of the filters are in the visible to short-wave near-IR wavelength range (MARCI-VIS: 437, 546, 604, 653, and 718 nm) and two are in the UV (MARCI-UV: 258 and 320 nm). During the MRO primary mission (November 2006 through November 2008), the instrument has acquired data swaths on the dayside of the planet, at an equator-crossing local solar time of about 3:00 p.m. We are analyzing the MARCI-VIS multispectral imaging data from the MRO primary mission in order to investigate (a) color variations in the surface and their potential relationship to variations in iron mineralogy; and (b) the time variability of surface albedo features at the approx. 1 km/pixel scale typical of MARCI nadir-pointed observations. Raw MARCI images were calibrated to radiance factor (I/F) using pre-flight and in-flight calibration files and a pipeline calibration process developed by the science team. We are using these calibrated MARCI files to generate map-projected mosaics of each of the 30 USGS standard quadrangles on Mars in each of the five MARCI-VIS bands. Our mosaicking software searches the MARCI data set to identify files that match a user- defined set of limits such as latitude, longitude, Ls, incidence angle, emission angle, and year. Each of the files matching the desired criteria is then map-projected and inserted in series into an output mosaic covering the desired lat/lon range. In cases of redundant coverage of the same pixels by different files, the user can set the program to use the pixel with the lowest I/F value for each individual MARCI-VIS band, thus minimizing the "contamination" of the resulting output mosaic by dust or water ice clouds. The user can also optionally specify one of the MARCI-VIS bands to minimize and to use as the template for the other bands. This forces a given location in the mosaic to use the same observation for all five bands. Here we present examples of the MARCI-VIS quadrangle maps generated to date, as well as the results of performing some standard multispectral parameterizations (include the red/blue color ratio, 546 nm band depth, 653 nm band depth, and red to near-IR spectral slope) on the five-band data in order to attempt to detect and map the distribution of iron-bearing minerals that exhibit diagnostic features in the MARCI-VIS wavelength regime. We also show examples of MARCI quadrangles and other regional mosaics from relatively low dust opacity periods in 2006 and 2008 to search for evidence of surface albedo variations associated with the planet-encircling dust event of 2007, and to compare the present albedo patterns to those seen in previous Viking, telescopic, and MGS albedo maps from the 1970s through the 2000s.
Anderson Benjamin R.
Bell Jon F.
Cantor Bruce
Kressler Karelyn
Operations Teams M.
No associations
LandOfFree
Color Mosaics and Multispectral Analyses of Mars Reconnaissance Orbit Mars Color Imager (MARCI) Observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Color Mosaics and Multispectral Analyses of Mars Reconnaissance Orbit Mars Color Imager (MARCI) Observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color Mosaics and Multispectral Analyses of Mars Reconnaissance Orbit Mars Color Imager (MARCI) Observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1237583