Analysis of Feasibility of Professional Operating on Estimating Rice Planting Area of Hilly Region in Southern China Using Remote Sensing Technique
南方丘陵地区水稻种植积遥感信息提取的可行性分析

The objective of the study (Zhejiang province as our test region) was to investigate how to utilize synthetically a wide variety of geographical information,included topographic map,vegetation map,land cover/use map and other ancillary information,for estimating rice planting area of hilly region in southern China by remote sensing technique with NOAA/AVHRR data.The research contents mostly concerned both the contrast tests on practical approaches and the relative stability test on training sample.Both DEM and digital slope imagery derived from the digital relief map were used for the purpose of improving the classification accuracies of AVHRR data in large hilly region.The results indicated that the accuracies of maximum-likehood classification could satisfy the professional requirement of estimating rice planting area and fuzzy supervised classification based on unmixing AVHRR imagery has better classification and stability than MLK.In addition,the results through using DEM and slope imagery as categorization data suggests slope imagery may improve the results of extracting paddy field signatures from AVHRR,particularly may improve the spatial precisions,while DEM contribute nothing to improve the accuracies mentioned above.The results also indicated that the precisions of estimating rice planting area with relative stable training sample exceeded 92%,up to 98%.