Data Set Overview : Each record in the table specifies a longitude and latitude on Mercury and an estimate of its radius at that location, derived from Goldstone Solar System Radar observations. All fields are separated by commas.   Processing Level Id : 4 Software Flag : N Processing Start Time : 1972 Processing Stop Time : 1990   Parameters :  Data Set Parameter 'PLANETARY ELEVATION' ---------------------------------------- Height of location on a planet or satellite surface, relative to some datum, e.g. relative to sea level on Earth, or relative to 6.5 millibar atmospheric pressure height on Mars.  Data Set Parameter Name : PLANETARY ELEVATION Data Set Parameter Unit : KILOMETER Sampling Parameter Name : PIXEL Sampling Parameter Unit : N/A Minimum Sampling Parameter : N/A Maximum Sampling Parameter : N/A Sampling Parameter Resolution : N/A Sampling Parameter Interval : N/A Minimum Available Sampling Int : N/A Noise Level : UNK   Source Instrument Parameters : Instrument Host ID : GSSR Data Set Parameter Name : PLANETARY ELEVATION Instrument Parameter Name : RADAR ECHO POWER Important Instrument Parameters : 1   Measurement Information :  Atmospheric Conditions ---------------------- NOT APPLICABLE   Source ------ The transmitter was the 64 meter antenna at the Goldstone Deep Space Network station.   Calibration Standard -------------------- NOT APPLICABLE   Wavelength Calibration ---------------------- The transmitter frequency is calibrated with a hydrogen maser.   Processing : N/A

Overview : Monte Carlo simulations indicate errors of about 150 meters in range. The actual accuracy depends upon signal to noise ratio, scattering law, and the profile distance from the sub-radar point.