sub-pixel area calculation methods for estimating irrigated areas亚像素面积计算方法估算灌溉地区.pdf

Sensors 2007, 7, 2519-2538 sensors ISSN 1424-8220 © 2007 by MDPI /sensors Full Paper Sub-pixel Area Calculation Methods for Estimating Irrigated Areas 1,* 2 3 1 Prasad S. Thenkabail , Chandrashekhar M. Biradar , Praveen Noojipady , Xueliang Cai , 1 3 4 1 Venkateswarlu Dheeravath , Yuanjie Li , Manohar Velpuri , MuraliKrishna Gumma 1 and Suraj Pandey 1 International Water Management Institute, Colombo, Sri Lanka. 2 Institute for the Study of Earth, Oceans and Space (EOS), University of New Hampshire, USA 3 Department of Geography, University of Maryland, USA 4 Geographic Information Science Center of Excellence, South Dakota State University, USA * Author to whom correspondence should be addressed. E-mail: p.thenkabail@ Received: 1 October 2007 / Accepted: 21 October 2007 / Published: 31 October 2007 Abstract: The goal of this paper was to develop and demonstrate practical methods for computing sub-pixel areas (SPAs) from coarse-resolution satellite sensor data. The methods were tested and verified using: (a) global irrigated area map (GIAM) at 10-km resolution based, primarily, on AVHRR data, and (b) irrigated area map for India at 500-m based, primarily, on MODIS data. The su