Title :
Global vegetation dynamic monitoring using multiple satellite observations, 2002–2007
Author :
Le Yang ; Du, Hejuan ; Zhao, Jing ; Liu, Qinhuo
Author_Institution :
State Key Lab. of Remote Sensing Sci., Beijing Normal Univ., Beijing, China
Abstract :
The backscatter values of altimeter and scatterometer have been investigated for possible use over land surface, especially for vegetation covered area. The spatial and temporal variations of backscatter coefficient of merged altimeter data (JASON1/ ENVISAT RA2), QuikSCAT, and CYCLOPES Leaf Area Index (LAI) over seven selected vegetated areas from 2002 to 2007 are calculated and compared. Initial results indicated that over vegetated areas with a strong seasonal cycle, the altimeter and scatterometer SigmaO measurements are strongly correlated to LAI. The Linear relation between VV/HH QuikSCAT backscatter and LAI is found at short and sparse vegetation, which is not valid at the dense vegetation. The VV/HH is not sensitive to low LAI value. The altimeter and scatterometer backscatter measurements of Ku band are useful to monitor vegetation dynamics as an independent data source compared to the products of optical sensors.
Keywords :
backscatter; height measurement; vegetation; vegetation mapping; AD 2002 to 2007; CYCLOPES; ENVISAT RA2; JASON1; Ku band measurement; VV-HH QuikSCAT backscatter; altimeter data; backscatter coefficient; backscatter value; dense vegetation; land surface; leaf area index; satellite observation; scatterometer; seasonal cycle; short vegetation; sparse vegetation; spatial variation; temporal variation; vegetation covered area; vegetation dynamics monitoring; Barium; Iron; Backscatter coefficient; LAI; Land altimetry; Scatterometer;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2011 IEEE International
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4577-1003-2
DOI :
10.1109/IGARSS.2011.6049244
