Retreat of top cliff of Kurungnakh Island, Lena Delta, Siberia, Russia, 2010-2014, with links to shapefiles ...

• Main Authors: Stettner, Samuel, Bartsch, Annett, Widhalm, Barbara, Heim, Birgit, Günther, Frank, Morgenstern, Anne, Roth, Achim, Chetverova, Antonina, Fedorova, Irina V
• Format: Dataset
• Language: English
• Published: PANGAEA 2015
• Subjects: DATE/TIME; Date/time end; File content; Uniform resource locator/link to file; Satellite remote sensing; RU-Land_2013_Lena; AWI Arctic Land Expedition; Ice; lena delta; permafrost; Siberia
• Online Access: https://dx.doi.org/10.1594/pangaea.846164; https://doi.pangaea.de/10.1594/PANGAEA.846164

Thawing-induced cliff top retreat in permafrost landscapes is mainly due to thermo-erosion. Ground-ice-rich permafrost landscapes are specifically vulnerable to thermo-erosion and may show high degradation rates. Within the HGF Alliance Remote Sensing and the FP7 PAGE21 permafrost programs we investigated how SAR and optical remote sensing can contribute to the monitoring of erosion rates of ice-rich cliffs in Arctic Siberia (Lena Delta, Russia).We produced two different vector products:i) Intra-annual cliff top retreat based on TerraSAR-X (TSX) satellite data (2012-2014):High-temporal resolution time series of TSX satellite data allow the inter-annual and intra-annual monitoring of the upper cliff-line retreat also under bad weather conditions and continuous cloud coverage. This published SAR product contains the retreating upper cliff lines of a 1.5 km long part of eroding ice-rich coast of Kurungnakh Island in the central Lena Delta. The upper cliff line was mapped using a thresholding approach for images ... : Technical details for the TSX processing:For the TSX preprocessing steps, multilooking and terrain correction, the open source software NEST from ESA was used. To improve image quality a simple multilooking using two looks was performed for every image of the time series. Because the eroding coast is observed over a three-year time span and no Digital Elevation Modell is available for each of the acquisition dates, instead an ellipsoid-based correction was performed with a geolocation grid and nearest neighbor resampling with full spatial resolution of 2.5 m in the UTM Map projection WGS84 Zone 52 North.Technical details for the optical satellite data processing:Orthorectification of the 2 optical satellite images on full spatial resolution in the UTM Map projection WGS84 Zone 52 North was performed using the software module OrthoEngine of PCI Geomatica 2014. In the rational functions model in total 7 ground control points (GCPs) and 13 Tie Points were set with an overall GCP RMS of 0.33 meters. GCPs were ...