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《Journal of Nanjing Institute of Meteorology》 2002-01
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Extraction of Crop Acreage Using GVG System and Its Precision Analysis

JIANG Xue-zhong, ZHAO Rui, LI Qiang-zi, WU Bin-fang, HE Long-hua(Deparment of Urban and Resources Sciences .Nanjing University, Nanjing 210093, China; Institute of Geography and Limnology,CAS,Nanjing 210008,China; Institute of Remote Sensing Application  
The GVG system is a new solution,with the conception of sampling lineage instead of the traditional sampling point or sampling area,to extracting crop acreage information. By calculating the crop acreage proportion to total arable land within the linear sample zone, we can obtain the total acreage percentage of different crops over the same agriculture district which has the same planting patterns. The another purpose of this text is to compare the data obtained by using GVG sampling lineage over a paddy test site centered on Longdu, Jiangning County(Jiangsu Province, China) and by extracting the information from Landsat 7 ETM+ imagery acquired during the period of paddy peak biomass. Preliminary analysis on the results indicates that the GVG sampling system provides the best solution for its efficiency and economy.