BEDMAP2 - Ice thickness, bed and surface elevation for Antarctica - standardised data points

The primary source data consist of survey point measurements of ice thickness, bed elevation and surface elevation, which principally comes from airborne radar surveys and seismic soundings, and to a smaller extent from ground-based radar surveys. All the data have been standardised to a specific CSV format. The format consists of (i) an extended header section where (a) each line is introduced by a comment ("#") character, (b) each line contains a single header item, (c) the colon character (":") is used as the key/value separator, (d) units are in parentheses, (e) attributes preferably use a common vocabulary such as the CF convention and includes attributes from the ACDD; (ii) a header row composed of the column name following the CF convention and units in parentheses; and finally (iii) the data using comma as the separator. The extended header consists of general information regarding each campaign such as the year, the name of the main investigator, funding and processing details. The variable names are as follows: trajectory_id Line or Flight ID trace_number Trace number from the specific line given in Line_ID longitude Longitude (WGS84 EPSG: 4326) in decimal degrees latitude Latitude (WGS84 EPSG: 4326) in decimal degrees date Date following ISO 8601 format: YYYY: year, MM: month, DD: day time_UTC UTC time following ISO 8601 format: HH: hours, MM: minutes, SS: seconds surface_altitude Surface elevation or altitude (referenced to WGS84) in meters land_ice_thickness Ice thickness in meters bedrock_altitude Bed elevation or altitude (referenced to WGS84) in meters two_way_travel_time Two-way travel time in seconds aircraft_altitude Aircraft elevation or altitude when applicable (referenced to WGS84) in meters along_track_distance Distance in the along-track direction in meters