关键词: 城市建设用地扩展, 遥感监测, 分层随机抽样, 精度分析

Abstract:

The shrinkage of China’s cultivated land is a world-wide concern, which is believed to arise from the increase of land used for construction purpose. In order to obtain a timely understanding of the land expansion for urban construction and the decrease of cultivated l and in China, remote sensing is being employed to monitor the expansion situation of land used for construction in the cities having above 500,000 non-agricultural population during various periods, and the accuracy estimation of the monitoring results constitutes an improtant aspect in this task. Up to now, many estimation indexes have been proposed which serve as a favorable base for future research. However, there still exist some drawbacks to be solved.In the article, a method of stratified random sampling is presented to obtain the accuracy analysis of remote sensing monitoring.The accuracy assessment is comprised of technological and regional assessment. It involves the assessment system of accuracy monitoring, the capacity determination of the stratified random sampling method, the procedure for sampling and evaluation, and the statistic analysis and result expression of the random survey. In addition, to verify the feasibility and suitability of this kind of method,the practice of the above system, based on data for Beijing and Chongqing in 2001 collected by remote sensing and fieldwork, is performed.Our work successfully applied the sampling theory to geoscienlific survey, which is of great theoretical and practical significance.

Key words: expansion of city land for construction, remote sensing monitoring, stratified random sampling, analysis of accuracy