Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2019, Vol. 16, No. 4, pp. 213-221
Observation of ice rings on Lake Baikal using Sentinel-1, 2 images in spring 2016–2018
1 V.A. Kotelnikov Institute of Radioengineering and Electronics RAS, Fryazino, Moscow Region, Russia
Accepted: 01.07.2019
DOI: 10.21046/2070-7401-2019-16-4-213-221
The paper analyzes images of ring structures on Lake Baikal ice derived from radar data of Sentinel-1 C-band and multispectral data of Sentinel-2 with a spatial resolution of 10 meters of March and April, 2016–2018. Joint processing of radar and optical images gives a significant advantage in the observation of ice rings. The advantage of radar sensing is high spatial resolution and independence of weather and time of day. Cloudiness and limited sensing time are a serious obstacle in obtaining high-quality optical images. But it is more difficult to recognize the ring structure on a radar image than on an optical one due to different physical mechanisms of image formation. Ring structures in the images are detected in the area of Cape Nizhneye Izgoloviye of the Saint Nose peninsular, Cape Ulan-Nur and Gulf Posolsky Sor. In this work, only in two radar images ring structures were visually detected: in the area of Cape Nizhneye Izgoloviye on April 13, 2016, and in the area of Cape Ulan-Nur on April 26, 2018. Texture features of Haralick can help detecting ice rings in a radar image. Sentinel-2 optical images are necessary to detect ring structures, but presence of clouds at the time of sensing is a serious problem.
Keywords: Sentinel-1 C-band radar data, Sentinel-2 optical data, ice rings on Lake Baikal, backscattering coefficient
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