摘要
通过在实验区内设置不同类型的采样线,对GVG采样线的代表性进行检验。结果表明,高速公路和乡村道路类型的采样线对区域代表性的精度在95%以上;国道为86.726%;省道为65.447%。对于不同的缓冲区,高速公路、省道和乡村道路类型采样线,以200m缓冲区的代表性最好。而国道则以800m缓冲区的代表性最好。对于不同的作物而言,无论何种类型的采样线或者缓冲区,种植面积最大的棉花的精度是最好的。最低的是省道采样线1000m缓冲区,精度是78.146%,最好的是国道采样线800m缓冲区,精度是99.974%。除省道外,其他精度都在94.8%以上。这说明GVG采样线所获得的成数对于区域主要作物的代表性是很好的。
The GVG crop sampling instrument is an integration system based on GIS,and is made up of GPS receiver,Video capturing.It has been applied in the field of the crop yield estimation widely.The authors verified accuracy of the representative of the GVG sampling lines in a test ground with an area of 5km×5km in Gong'an County,Hubei Province.The map of land plot in the experiment area was drawn out based on land use map and high resolution satellite image-SPOT5.The crop area proportion of each land plot was investigated and marked on the map of the land plot,and then the true proportions of the crop in the experiment area were worked out.Four types of the sampling lines were set up in the experiment area.They were freeway,national road,provincial road and countryside road.The GVG instrument was used to sample the crops based on the sampling lines,and then the crop proportion of GVG were obtained.The buffers of 200m,500m,800m,and 1000m of each sampling line were set up and the true crop proportion of the buffers were obtained based on GIS.The representative of the sampling lines was verified by comparing the true values with the experimental values.The results showed that the sampling lines of freeway and countryside road had the best accuracy greater than 95%,the national road took the second place with an accuracy of 86.726%,and the provincial road was the worst with an accuracy of 65.447%.Among all the buffers,the 200m-buffers of the freeway,provincial road and countryside road had the best representative,and it matched the buffer of 100—200m as we designed the GVG system.But the best of the national road is the 800mbuffer.As for different crops,no matter what type the sampling line or buffer is,the accuracy of the cotton was the best,the lowest was the 1000m-buffer at the type of the provincial road sampling line with the accuracy of 78.146%,and the best was the 800m-buffer of national road with the accuracy of 99.974%.All the accuracies of the sampling lines were over 94.8%,except the provincial road.It showed that the GVG instrument has a very good representative for the dominant crop-cotton which had the highest accuracy to each buffer in every sampling line.
出处
《遥感学报》
EI
CSCD
北大核心
2008年第2期263-269,共7页
NATIONAL REMOTE SENSING BULLETIN
基金
国家863计划,粮食预警遥感辅助决策系统(编号:2003AA131051)
关键词
GVG采样线
缓冲区
代表性
检验
GVG sampling line
buffers
representation
verification
作者简介
吴胜军(1972-),男.副研究员,工学博士,毕业于中国地质大学.主要从事生态环境相关研究,已发表论文30多篇,E-mail:wsj@whigg.ac.cn.
