The goal of this study was to examine the potential of a unique X-band SAR dataset to monitor ice phenology and bedfast ice on a number of thermokarst lakes in the Siberian Arctic. Three-year repeat-pass TSX time series with high temporal (11 days) and spatial (10 m) resolution were used. Two different parameters derived from SAR imagery were employed in the analysis: backscatter intensity and 11-day interferometric coherence. In situ ice thickness measurements were collected at 14 locations from a sample of 10 lakes in April 2015. A region of interest (ROI) was created around each in situ ice thickness measurement location as a circle with a diameter of approximately 10 pixels. We provide extracted backscatter and coherence for all the ROIs as georeferenced .tif files for the entire time series.

Input dataset includes 95 repeat-pass StripMap TerraSAR-X images acquired over the central Lena River Delta, Siberia, from 3 August 2012 to 2 October 2015 every 11 days with a few gaps. TerraSAR-X is a Synthetic Aperture Radar operating in X-band (wavelength 3.1 cm, frequency 9.6 GHz). The scene size measured approximately 18 × 56 km. The orbit was in descending pass and the radar was right-looking. The acquisition incidence angle was approximately 31° and the polarization channel was HH for all used images. Local time of acquisitions was 08:34 (UTC: 22:34). 95 backscatter intensity images, calibrated to sigma nought and converted to decibels, were obtained. 84 coherence images, each with a temporal baseline of 11 days, were obtained from interferometric pairs of coregistered TerraSAR-X images. Both the backscatter intensity images and the coherence images were geocoded to the WGS84 ellipsoid with a pixel size of 10 m 10 m in the Universal Transverse Mercator (UTM) projection Zone 52N.The provided dataset includes two .zip files (for intensity and coherence data), each containing 14 folders named according to the ROIs, where "Fl-..." means floating ice and "Gr-..." means grounded (bedfast) ice. Each of 14 folders contains the entire time series of intensity or coherence for extracted ROI as georeferenced .tif files.