摘要
最佳时相遥感图象的选择是农作物遥感估产的关键环节之一，它必须兼顾作物识别和单产模拟对遥感时相选择的要求，综合考虑多方面的影响因素。根据农作物遥感估产中各项工作的具体要求，以提高遥感图象中目标作物信息及其与作物单产关系的显著程度为主要目的，分析了农作物遥感估产最佳时相的选择依据，认为它主要包括作物光谱的种间差异、作物物候历的种间差异、太阳高度角的变化、作物产量形成的关键期、作物面积对收获面积的代表性以及土壤光谱噪声的变化。此外，还分别选择了我国各地水稻、小麦和玉米遥感估产的最佳时相，作出了它们的最佳时相分区图，供全国范围内主要粮食作物遥感估产参考。
One of the key links in crop estimation using remote sensing data is the selection of the optimum temporal images,in which the selection of the optimum temporal for identification of a certain target crop must be combined with that for unit yield simulation of the target crop.Its main aims are both to enlarge the differences of spectral information between the target crop and other objects on remote sensing images and to improve significance of the correlation between unit yield and spectral information of the target crop.In this study,according to the demands of crop estimation using remote sensing data,the selection bases and methods of the optimum temporal are discussed.The results indicate that the selection bases include the differences of reflectance spectrums between crop species,differences of phenological calendars between crop species,changes of solar altitude,key periods of crop production of the target crop in total growing period,changes of the spectral noise from soil and possible reduction of the area of a certain target crop in its total growing period.The optimum temporals for crop estimates of rice,wheat and maize in China using remote sensing data are selected and regionalizated besides.
出处
《生态学报》
CAS
CSCD
北大核心
1998年第1期48-55,共8页
Acta Ecologica Sinica
基金
"八五"科技攻关课题
关键词
农作物
遥感估产
最佳时相
crop,crop estimates using remote sensing datat,optimum temporal.
