The ROSETTA-Ice Deep ICE Radar(DICE) data set contains ice thickness measurements of the Ross Ice Shelf in Antarctica using the IcePod. The ROSETTA-Ice project flew three campaigns for three consecutive years during November and December with the IcePod. A total of 43 flights were flown. The data set contains PNT measurements acquired from a Global Navigation Satellite System (GNSS) Inertial Navigation Systems (INS) system aboard the IcePod. Ice thickness measurements derived from layer (bright visible horizon) picking. Table 1. IcePod Shallow Ice Radar System(SIR) & INS Receiver Type ----------------------------------------------------------------- The DICE is a pulsed-chirp depth-sounding radar system that is on board the IcePod. It was built and modified at the Lamont-Doherty Earth Observatory. The DICE has a 60 MHz bandwidth with a power output of 1200W and a 188MHz center frequency. The PNT system that is on board the IcePod and used for SIR data processing is a NovAtel OEM/SPAN with SPAN LN200 IMU (POD-INS/SPAN). Table 2. Campaign, Project Year, and Description ------------------------------------------------ Campaign (Year): Description RS01 (2015): The first ROSETTA-Ice campaign was flown during November and December of 2015. RS02 (2016): The second ROSETTA-Ice campaign was flown during November and December of 2016. RS03 (2017): The third ROSETTA-Ice campaign was flown during November and December of 2017. --------------------------- File Format and Information --------------------------- The deep ice thicknesses are concatenated in Comma Separated Values file format (.csv). This data remains undecimated at 50hz. Surface Elevation is only delivered where a horizon has been picked. As such, the SurfElev variable is not representative of the actual flown DICE surface coverage. ---------------------- File Naming Convention ---------------------- Example file names: Concatenated Picks Data: ROSETTA-Ice_DICE_IceBasePicks.csv Concatenated Data were named according to the following file naming convention: __ . csv Table 3: File Naming Convention for Concatenated CSV ------------------------------------------------------ Variable: Description: Project-Name ROSETTA-Ice Project Sensor IcePod Sensor Type PickedHorizon Horizon visible in Radar Picked as Data Table 4: Header Information for DICE Thickness CSV Data Product --------------------------------------------------------------- Variable: Description: Line ROSETTA-Ice Line Grid Identification Number Lat Latitude of echo in degrees Lon Longitude of echo in degrees unixTime Unix seconds (slow-'along track' time) of each echo Number of seconds that have elapsed since 01 Jan 1970 00:00:00 UTC -leap seconds FlightElev Ellipsoid flight elevation in meters. If motion compensation is true, FlightElev is irrelevant SurfElev This is ellipsoid elevation of the surface Thickness Depth of the horizon picked under the surface (thickness) calculated using cIce = 1.68e8 and along track TWTT Bright Signal power (dB) of the pixel. This is a relative number with 0 dB being some arbitrary value that is consistent as long as there a no significant changes with processing FlightElev_MotionComp Elevation correction is performed to this altitude (feet). If motion compensation is true, this is the flight elevation. FileNum File Frame Identification Number. Data is processed in 30km(5minute) frames, each with an identification number. --------- File Size --------- The Concatenated DICE thickness file (.csv) is 525 MB. ---------------- Spatial Coverage ---------------- The approximate spatial coverage of the ROSETTA-Ice survey is below. Southernmost Latitude: 78° S Northernmost Latitude: 86° S Westernmost Longitude: 150° W Easternmost Longitude: 161° E ----------------- Temporal Coverage ----------------- 09 November 2015 to 04 December 2017 ROSETTA-Ice campaigns were conducted on an annual basis for three consecutive years during November and December with the IcePod. Table 5. IcePod Inertial Explorer Export Profiles and Sampling Rate ------------------------------------------------------------------- IcePod Inertial Explorer Export Profile: Sampling rate IcePod Deep ICE Radar : 50Hz IcePod Trajectory Standard: 200 Hz -------- Contacts -------- Robin Bell Lamont-Doherty Earth Observatory of Columbia University 108E Oceanography 61 Route 9W - PO Box 1000 Palisades, NY 10964-8000 USA Email: robinb@ldeo.columbia.edu -------------------- Document Information -------------------- Document Creation Date: 24 May 2019 Document Revision Date: 26 November 2019