Chukchi Sea Landfast Sea Ice: Daily Seaward Landfast Ice Edge (SLIE) Extent October 1996 – July 2023

A landfast ice dataset along the Chukchi Sea continental shelf, spanning 1996-2023. Spatial resolution is 100 m. The dataset is derived from three sources: seaward landfast ice images derived from synthetic aperture radar images from the RadarSAT and EnviSAT constellations (1996-2008), the Alaska Sea Ice Program (ASIP) ice charts (2008-2017, 2019-2022), and the G10013 SIGID-3 Arctic Ice Charts produced by the National Ice Center (NIC; 2017-2019, 2022-2023).

Within each GeoTIFF file there are 5 different pixel values representing different characteristics:
0 - Not Landfast Ice
32 - Coast Vector Shadow
64 - Out of Bounds
128 - Land
255 - Landfast ice

The file naming convention is as follows:
chukchi_$YYYYMMDD_$source_slie.tif

For example, the name

chukchi_20170302_asip_and_nic_average_slie.tif

indicates the file represents data for March 2, 2017 and that the data is derived from an average of the ASIP and NIC data sources.