摘要
概述了国内外区域作物需水量估算的研究进展,重点介绍了传统方法、定量RS方法在区域作物需水量方面的应用,分析了目前区域作物需水量估算研究中存在的非均匀地表影响和尺度转换等问题,指出只有将GIS、RS等先进技术与传统方法相结合,获取精度较高的DEM数据和土地类型等基础数据来考虑非均匀地表的影响,合理地布点、RS估算数据与实测数据的对比和率定,才能比较准确地估算区域作物需水量。
In this paper, advance of researches on regional crop water requirements evaluation is reviewed firstly. Traditional means and remote sensing means to estimate regional crop water requirements are mainly introduced. Existing problems such as influence of variable land surface and scale conversion are also analyzed. Based on it, the author proposed some probable methods that should be applied in the future development of regional crop water requirements evaluation to overcome error. These methods included combining GIS and RS with traditional means, obtaining accuracy DEM data and ground type data to consider the influence of variable land surface, deciding rational sampling number and proper position of the observation stations, comparison and calibration of the experimental data and evaluation data using RS.
出处
《节水灌溉》
北大核心
2005年第3期4-7,共4页
Water Saving Irrigation
基金
国家高技术研究发展计划("863"计划)(2002AA2Z403)
水利部创新基金项目(SCX200222)资助
关键词
作物需水量
区域
估算
遥感
crop water requirements
region
evaluation
RS
