Analysis of Surface Deformation in East Dongting Lake Based on 2016-2019 Sentinel-1A Dataset

Table 2

Comparison of the intensity grades of surface deformation in the dry seasons.

Intensity grade of surface deformation	Surface deformation area in the dry season
	2017		2018		2019
	Area (km^2)	%	Area (km^2)	%	Area (km^2)	%
Severe settlement	0.04	0.002	6.62	0.370	0.88	0.050
Moderate settlement	19.99	1.121	67.68	3.781	15.82	0.895
Slight settlement	356.10	19.968	349.78	19.542	335.50	18.985
Stable area	959.70	53.814	717.26	40.072	843.28	47.720
Slight sedimentation	440.93	24.725	619.87	34.631	549.04	31.069
Severe sedimentation	6.59	0.370	28.70	1.604	22.64	1.281