The ROSETTA-Ice LiDAR nadir data set contains LiDAR measurements taken over the Ross Ice Shelf in Antarctica. 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. Table 1. Campaign, Project Year, and Description ------------------------------------------------ Campaign (Year): Description AN02 (2015): The first ROSETTA-Ice campaign was flown during November and December of 2015. AN03 (2016): The second ROSETTA-Ice campaign was flown during November and December of 2016. AN04 (2017): The third ROSETTA-Ice campaign was flown during November and December of 2017. --------------------------- File Format and Information --------------------------- The LiDAR nadir surface was exported from Geosoft in comma-separated values file format (.csv). The LiDAR nadir surface was extracted from narrow swath LiDAR data for each flight. The narrow swath LiDAR data used to obtain the nadir surface was exported from RiPROCESS in LAS (v 1.4, without waveform data) file format (.las). A 10 degree angle filter was applied to achieve the narrow swath. Table 2. Narrow swath LiDAR LAS File Information ------------------------------------------------ Format: LAS (v 1.4, without waveform data) Coordinate Reference System: WGS84 / Geographic Datum Transformation: none Source data: Export original points Time domain: Adjusted GPS Time (GPS Time - 1e9 sec.) Intensity source: Reflectance Reflectance (dB): -25.00 to 5.00 Angle Filter: Start angle [deg]: 85 Stop angle [deg]: 95 Coordinate resolution: 0.00025 Coordinate axis 1: Longitude Coordinate axis 2: Latitude Coordinate axis 3: Altitude ---------------------- File Naming Convention ---------------------- ROSETTA_LIDAR_VQ580_Nadir.csv Data were named according the following file naming convention: ___.xxx Table 3. File Naming Convention ------------------------------- Variable: Description: Project The ROSETTA-Ice project Sensor type IcePod sensor type Sensor name Name of sensor Nadir Indicates that the file is the nadir surface extracted from the LiDAR swath data. .xxx Indicates the file type. Comma-separated values file format (.csv) --------- File Size --------- The LiDAR nadir data set is approximately 40 MB. ---------------- Spatial Coverage ---------------- The approximate spatial coverage of the ROSETTA-Ice survey is below. Southernmost Latitude: 86° S Northernmost Latitude: 78° 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. --------------------- Parameter or Variable --------------------- The ROSETTA-Ice LiDAR nadir data set contains measurements for the surface. Table 4. LiDAR Nadir CSV file Parameters, Units, and Description -------------------------------------------------------------------------------------- Name (Units): Description Campaign (N/A): IcePod campaign number. (AN02 = 2015, AN03 = 2016, and AN04 = 2017) Flight Number (F####): Flight number for survey Line Number: The ROSETTA-Ice survey line number UTCDate (mm/dd/yyyy): Coordinated Universal Time (UTC) date UTCTime (HH:MM:SS.FFF): Coordinated Universal Time (UTC) time of day Unixtime (seconds): Unix time is the number of seconds that have elapsed since midnight (00:00:00 UTC) on January 1st, 1970 Latitude (degrees): Latitude decimal degrees WGS84 Longitude (degrees): Longitude decimal degrees WGS84 X_EPSG_3031 (meters): Polar stereographic projected coordinates true to scale at 71° S Y_EPSG_3031 (meters): Polar stereographic projected coordinates true to scale at 71° S H_Ell (meters): Height above WGS84 ellipsoid SurfHell (meters): LiDAR extracted surface height in meters above WGS84 ellipsoid SurfHell_Edit (meters): SurfHell that has been partially cleaned for clouds and other noise ------------------- LiDAR Data Coverage ------------------- 35 LiDAR flights were flown by the ROSETTA-Ice campaigns over three consecutive years. AN02 (2015): F1003-F1006 and F1010-F1019 AN03 (2016): F1001-F1008 and F1010 AN04 (2017): F1001-F1012 ------------------------------- Data Acquisition and Processing ------------------------------- The LiDAR swath data set was acquired on a RIEGL VQ-580 Airborne Laser Scanner and processed with the RIEGL RiPROCESS Data Processing Software. Narrow swath data were exported from RiPROCESS in the LAS (v 1.4, without waveform data) file format (.las) for each flight. The LiDAR nadir surface was extracted from the narrow swath data with the MATLAB script, lasSurfElev.m, developed by Tej Dhakal. Flights were partially cleaned for clouds and other noise. Some clouds and noise remain after processing. -------- 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: 15 January 2019 Document Revision Date: 10 October 2019