PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 720 FILE_RECORDS = 180 ^IMAGE = "GOM1041B.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 = "geoid.mgm1041c.xyz.66" PRODUCT_ID = "GOM1041B.IMG" PRODUCT_RELEASE_DATE = 2003-03-28 DESCRIPTION = " This file contains a digital map of the Mars geoid evaluated for the MGM1041C model to 66x66. The model was constructed from 2,568,683 observations, summarized in the table below. MGS data are limited to tracking from the Aerobraking Hiatus and Science Phasing Orbit (SPO) subphases of the Orbit Insertion phase of the mission and from February 1999 to March 2002 after the orbit was circularized. Time Periods Total Arcs Observations ----------------------- ---- ------------ Hiatus 2 24119 SPO-1 8 31014 SPO-2 17 144253 Feb-Mar 1999 10 86069 2 Apr 1999 - 22 May 2002 167 2186533 Doppler + Crossovers 5 96875 ----------------------- ---- ------------ Total 2568863 The gravity anomalies were evaluated on a reference spheroid with the following constants: GM = 4.282837024529170e+13 m**3/s**2, equatorial radius 3397000 m, rotation rate 7.088218066303858e-5 rad/s, and inverse flattening 1/f = 196.877360." START_TIME = 1997-10-13T00:00:00 STOP_TIME = 2002-05-27T23:59:59 SOFTWARE_NAME = "SOLVE;9603.02" PRODUCT_CREATION_TIME = 2003-02-05T20:34:50 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 gives Mars geoid height in meters. 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 = "DSMAP3.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