文献类型： 会议论文
第一作者： Shuanghe Shen
作者： Shuanghe Shen 1 ; Pingping Zhang 2 ; Bingbai Li 3 ;
作者机构： 1.College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, Jiangsu Province 210044, P.R. China
2.Hubei Meteorological Bureau, Wuhan, Hubei Province 4.30074 , P.R. China
3.Jiangsu Academy of Agricultural Sciences, Nanjing, Jiangsu Province 210014, P.R. China
关键词： paddy rice;ASAR;polarization;NDVI
会议名称： Optics for natural resources, agriculture, and foods II :
主办单位：
页码： 67610F-1-67610F-8
摘要： Paddy rice is a staple food in China and it's growth monitoring, acreage extraction and yield estimate are of far reaching importance, It is difficult to apply conventional remote sensing technique for obtaining precise information on paddy planting and growth , for rice bowls are mostly distributed over rainy regions in China. The radar image is unlimited by cloud, rain and fog, and could proceed all weather operation and obtain more stable data, therefore it could be used for addy monitoring. Making use of Envisat's ASAR data and NOAA data in 2004 , paddy's backward-scattering characteristics with different polarizations were studied in this paper, To combine muti-temporal radar data with one view ETM image , paddyfield of experimental area in Hongze of Jiangsu Province was classified. Results show that 1) characteristics of paddy's nh and w polarizations vary from stage to stage and vv polarization is more sensitive. The polarization ratio hh / vv of paddy during metaphase is apparently higher than other objects'. 2) paddy's polarization ratio hh / w and growth vigor closely relate to each other , thereof two empirical time-domain models of backward- scattering were established, wherewith to estimate number of days after transplanting and growing season 3) hh and ratio hh / vv are both well correlated with NDVI. 4) hh polarization data could be used for information extraction of towns and water bodies , and the hh / vv image in metaphase for partition of paddy from other objects. The recognition accuracy being ninety percent over, muti-temporal and -polarization radarsat data are of predominance and potential for paddy growth and/or acreage monitoring.
分类号： N5
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