Early Identifying and Monitoring Landslides in Guizhou Province with InSAR and Optical Remote Sensing

Table 4

Identification Result of Possible Landslide Area Based on Time Series NDVI.

Landslide number	Study area	Variation characteristics of time series NDVI	Potential landslide (yes/no)
#6	Liupanshui	NDVI gradually decreased during the monitoring period	Yes
#31		Continuous decline in the short term, and then rebound to normal value in the later period	Yes
#39		During the monitoring period, the NDVI value continued to decrease	Yes
#19	Guian	During the monitoring period, the NDVI value decreased significantly in the short term, and then gradually returned to the normal value level	Yes
#1	Tongren	There is no abnormal change in the NDVI value	No
#3		NDVI value is at a lower level compared to the same period in previous years	Yes
#4		During the monitoring period, the NDVI value has a tendency to decrease slowly, and a sudden drop in the later period occurs	Yes
#10
#11
#12		Although the NDVI value is disturbed, the overall trend is decreasing continuously	Yes
#15		During the monitoring period, the NDVI curve showed a slow downward trend, and NDVI continued to be below 0.1 for a period of time	Yes
#16
#17
#19		During the monitoring period, NDVI fell suddenly, and remained at a level close to 0 in the later period.	Yes