气候变化领域集成服务门户(CCPortal): TerraSAR-X backscatter and 11-day interferometric coherence time series of one year (2012-2013) for different landscape types in the Lena River Delta, Siberia, link to shape file

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.873553
	TerraSAR-X backscatter and 11-day interferometric coherence time series of one year (2012-2013) for different landscape types in the Lena River Delta, Siberia, link to shape file
	Antonova; Sofia; Kääb; Andreas; Heim; Birgit; Langer; Moritz; Boike; Julia
发布日期	2016-03-15
数据集类型	dataset
英文简介	Time series of TerraSAR-X backscatter intensity and 11-day interferometric coherence with high temporal resolution have been used to interpret major seasonal land surface changes in a variety of tundra environments, namely an area of wet polygonal tundra, a drier Ice Complex upland area, a recently drained well-vegetated lake basin, a partly well-vegetated floodplain, a bare sandbank, and a very dry area of rocky outcrops. Seasonal variations in intensity and coherence were evaluated in the context of meteorological conditions such as air temperatures, precipitation and snow cover status. The TSX signal appeared to have very limited penetration through vegetation and the observed variations in backscatter and coherence were therefore mainly attributed to processes in the upper layer of vegetation. Variations in the TSX backscatter intensities were mostly moderate throughout the annual cycle. Backscatter was found to be insensitive to ground freezing and thawing as well as being generally insensitive to precipitation, but it was sensitive to (i) an individual rain event at the time of SAR acquisition, (ii) an individual snow shower coinciding with unusually high air temperature, and (iii) the spring melt of the snowpack (likely with a refrozen icy crust on the surface). Flooding of the sandbank was clearly detectable from extremely low backscatter values. The selected regions of interest (ROIs) demonstrated generally good separability on the basis of differences in their backscatter intensities: rough and very sparsely vegetated rocky outcrops yielded the highest backscatter and the smooth barren sandbank yielded the lowest backscatter. The backscatter from the vegetated ROIs yielding intermediate values, with the less vegetated ROIs returning lower backscatter.
空间范围	Median Latitude: 72.950000 * Median Longitude: 126.550000 * South-bound Latitude: 72.000000 * West-bound Longitude: 123.600000 * North-bound Latitude: 73.900000 * East-bound Longitude: 129.500000
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/219077
推荐引用方式 GB/T 7714	Antonova,Sofia,Kääb,et al. TerraSAR-X backscatter and 11-day interferometric coherence time series of one year (2012-2013) for different landscape types in the Lena River Delta, Siberia, link to shape file.2016-03-15.https://doi.org/10.1594/PANGAEA.873553.