A landfast ice dataset along the Chukchi Sea continental shelf, spanning 1996-2023. 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 ice charts (2008-2017, 2019-2022), and the G10013 SIGID-3 Arctic Ice Charts produced by the National Ice Center (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.