PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 720 FILE_RECORDS = 180 ^IMAGE = "GGM1025B.IMG" INSTRUMENT_HOST_NAME = "MARS GLOBAL SURVEYOR" TARGET_NAME = MARS INSTRUMENT_NAME = "RADIO SCIENCE SUBSYSTEM" DATA_SET_ID = "MGS-M-RSS-5-SDP-V1.0" ORIGINAL_PRODUCT_ID = "anom.mgm1025.xyz.todeg66" PRODUCT_ID = "GGM1025B.IMG" PRODUCT_RELEASE_DATE = 2002-01-01 DESCRIPTION = " This file contains a digital map of Mars gravity anomalies evaluated for the MGM1025 model to 66x66. The model was constructed from 1,625,276 observations, summarized in the table below. Data acquired from February 1999 onward (GCO and Mapping) were using the nominal (circularized) Mapping orbit. Time Periods Total Arcs Observations ----------------------- ---- ------------ Hiatus 2 24119 SPO-1 8 31014 SPO-2 14 136667 GCO 9 80795 Mapping 122 1352661 ----------------------- ---- ------------ Total 1625276 The analysis and results were described by F.G. Lemoine, G.A. Neumann, D.S. Chinn, D.E. Smith, M.T. Zuber, D.D. Rowlands, D.P. Rubincam, and D.E. Pavlis in 'Solution for Mars Geophysical Parameters from Mars Global Surveyor Tracking Data', American Geophysical Union Fall Meeting 2001 (EOS, Trans. AGU 82(47), Fall Meeting Supplement, Abstract P42A-0545, F721, 2001). The gravity anomalies were evaluated on a reference spheroid with the following constants: GM = 4.2828369773938997e+13 m**3/s**2, equatorial radius 3397000 m, rotation rate 350.89198266 deg/day, and inverse flattening 1/f = 196.877360." START_TIME = 1997-10-13T00:00:00 STOP_TIME = 2000-07-21T23:59:59 SOFTWARE_NAME = "SOLVE;9603.02" PRODUCT_CREATION_TIME = 2001-11-01T22:50:36 PRODUCER_ID = "MGS RST" OBJECT = IMAGE LINES = 180 LINE_SAMPLES = 360 SAMPLE_TYPE = MSB_INTEGER SAMPLE_BITS = 16 OFFSET = 0.0 SCALING_FACTOR = 0.1 DESCRIPTION = "The Digital Map contains values of vertical gravity in milligals (1 milligal = 0.01 mm/s/s). The true values can be obtained by multiplying the sample in the map by SCALING_FACTOR and then adding OFFSET. " END_OBJECT = IMAGE OBJECT = IMAGE_MAP_PROJECTION ^DATA_SET_MAP_PROJECTION = "DSMAP2.CAT" COORDINATE_SYSTEM_TYPE = "BODY-FIXED ROTATING" COORDINATE_SYSTEM_NAME = PLANETOCENTRIC MAP_PROJECTION_TYPE = "SIMPLE CYLINDRICAL" A_AXIS_RADIUS = 3397.00 B_AXIS_RADIUS = 3397.00 C_AXIS_RADIUS = 3397.00 FIRST_STANDARD_PARALLEL = "N/A" SECOND_STANDARD_PARALLEL = "N/A" POSITIVE_LONGITUDE_DIRECTION = "EAST" CENTER_LATITUDE = 0.0 CENTER_LONGITUDE = 0.0 REFERENCE_LATITUDE = 0.0 REFERENCE_LONGITUDE = 0.0 LINE_FIRST_PIXEL = 1 LINE_LAST_PIXEL = 180 SAMPLE_FIRST_PIXEL = 1 SAMPLE_LAST_PIXEL = 360 MAP_PROJECTION_ROTATION = 0.0 MAP_RESOLUTION = 1.0E+00 MAP_SCALE = "N/A" MAXIMUM_LATITUDE = 89.5 MINIMUM_LATITUDE = -89.5 EASTERNMOST_LONGITUDE = 179.0 WESTERNMOST_LONGITUDE = -180.0 LINE_PROJECTION_OFFSET = 89.5 SAMPLE_PROJECTION_OFFSET = 180.0 END_OBJECT = IMAGE_MAP_PROJECTION END