小地物比例提取在河北耕地遥感调查中的应用研究

小地物的存在是影响大尺度下遥感面积监测的重要因素。该文以河北省为研究区域，借鉴分层抽样的基本思想，采用分区抽样方法，在不同立地条件的耕地上布设小地物抽样样方，共99个，最终得到河北省耕地中小地物面积比例的一系列估计值。其中，水田为10.15％，平原为3.51％，丘陵为7.14％。利用该数据对河北耕地面积遥感调查结果进行修正，可有效提高其结果的精度，对于河北省耕地面积遥感调查、作物面积遥感调查等应用具有实用性和使用价值，同时对具有相似立地条件的地区有重要的参考价值。

Estimation of area ratios of small features in crop area obtained by remote sensing technique in Hebei Province

Small features are a key factor affecting monitoring crop area using remote sensing on a large scale. Taking Hebei Province as a study area, stratified sampling method for reference and zonal sampling method were applied to process small features sampling frames in crop land under different conditions with 99 in all. Finally, a series of estimation values of area ratios of small features were obtained in Hebei crop land. Thereinto, 10.15% in paddy field, 3.51% in plain, and 7.14% in sloping crop land. Precision of surveying results by remote sensing in Hebei Province could be improved with the data. And the result has much practicability and usage for surveying crop land in Hebei Province by means of remote sensing. It also has important references for the similar areas.