耕地变化空间抽样调查方案的精度与效率分析
Accuracy and efficiency of different spatial sampling schemes for cropland change monitoring
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摘要: 已有研究表明,利用遥感空间抽样方法来监测耕地变化是可行的,如何选择最佳空间抽样方案以提高效率、节省费用则是其需解决的核心问题。采用3种抽样方法(简单随机抽样、分层抽样、系统抽样)与2种抽样框(规则抽样框、不规则抽样框),设计了6种不同组合的遥感空间抽样方案进行试验;根据不同抽样框与平均每样本调查费用大小的关系,分析了不同耕地变化遥感空间抽样调查方案的精度与效率,并以北京市顺义区为例进行了试验验证,结果表明:采用分层-不规则框进行耕地变化遥感空间抽样调查具有较高的精度和效率。进一步的敏感性分析表明,分层-不Abstract: Previous researches have proved the feasibility of monitoring cropland changes using spatial sampling methods. However, how to improve efficiency and reduce cost by designing an optimal spatial sampling scheme is a key issue. Six sampling schemes were des