The ROSETTA-Ice Shallow Ice Radar (SIR) 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 Position, Navigation, & Time (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 SIR is a Frequency Modulated Continuous Wave (LFMCW) Radar system that is on board the IcePod. It was built and modified at the Lamont-Doherty Earth Observatory. The SIR has a 600 MHz bandwidth with a power output of ~1W and a 2 GHz center frequency at a 1ms chirp. 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). This yields the position of the aircraft to less than 10cm, Pitch, Roll, and Yaw at a sample rate of 10Hz. 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 shallow ice images are generated in Portable Network Graphics (.png) file format. Due to the high resolution of the radar imagery, some ROSETTA-Ice Lines are split and generated in multiple PNGs in order to maintain a manageable file size. Each SIR line image is plotted North --> South, or West --> East; and is also plotted by Start Time --> End Time of the ROSETTA-Ice Line during the Flight, using UTC Time. ---------------------- File Naming Convention ---------------------- Example file names: RS01 (2015) Line Image: L650_20151123_102343_SIR_5623by1100.png RS02 (2016) Line Image: RS02_L650_20161123_102343_SIR_5623by1100.png RS03 (2017) Line Image: L650_20171123_102343_SIR_5623by1100.png Line-By-Line Data were named according the following file naming convention: ____ . png Table 3: File Naming Convention for Radar PNG --------------------------------------------- Variable: Description: Line Number ROSETTA-Ice Line Grid Identification Number YYYYMMDD Date of Survey / Data Collection (Year, Month, Date) hhmmss Time of Survey / Data Collection (hours, minutes, seconds) Sensor Type IcePod Sensor Type ImageDimensions Dimensions of Generated PNG Image Table 4: Axis Information for SIR PNG Product --------------------------------------------- Label Location: Label Type: Title Name of Radar PNG File X-Axis Distance from start of Image File in Kilometers (km) & Geographic Coordinates in Degrees Y-Axis Depth of Radar Image in Meters (m) with Ice Surface at Zero. --------- File Size --------- A SIR Plot Image (.png) generated at 300dpi is approximately 8 MB. The ROSETTA-Ice SIR Image (.png) Dataset is approximately 945 MB. SIR Images (.png) generated at 600dpi are available upon request. ---------------- 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 Shallow 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: 25 November 2019