Arctic Sea Ice Topography from a Triangulated Surface Model

Airborne Data

The "ATM_Elevations" and "ATM_TIN_model" datasets are derived from NASA Operation IceBridge Airborne Topographic Mapper (ATM) lidar data (Studinger, 2013) acquired on September 9, 2019. The ATM elevations and Triangulated Irregular Network (TIN) model are provided as ascii text (.txt) and .ply files, respectively.

The coordinates of the ATM elevations are provided in the NSIDC Sea Ice Polar Stereographic North projection (epsg: 3411) and the elevations are relative to the EGM2008 geoid model. The columns of the .txt files are as follows:

Projected Longitude (meters)

Projected Latitude (meters)

Elevation (meters, relative to the EGM2008 geoid)

ATM elevations and ATM TIN model data are provided in three parts/sections and in total cover ~72 km in length.

Spaceborne Data

The "UMDRDA_Elevation_&_Ridges" dataset is derived from the ICESat-2 Global Geolocated Photon Height Product (ATL03, Neumann et al., 2021), release 005, using the University of Maryland-Ridge Detection Algorithm (UMD-RDA, Duncan & Farrell, 2022). The UMD-RDA is applied to ATL03 granules on a per-shot basis, nominally resulting in elevation measurements at ICESat-2's along-track sampling of ~0.7 m.

The UMDRDA elevation and ridge locations are provided in the NSIDC Sea Ice Polar Stereographic North projection (epsg: 3411) and the elevations are relative to the EGM2008 geoid model. The columns of the .txt file are as follows:

Projected Longitude (meters)

Projected Latitude (meters)

Time (seconds since 2018-01-01)

Elevation (meters, relative to the EGM2008 geoid)

Ridge Flag (0 = not a ridge, 1 = ridge)

UMDRDA data cover approximately the same 72 km area as the ATM data.

For any questions regarding this dataset you can contact Kyle Duncan by email: kduncan at umd . edu