GIS支持下的小麦区域化苗情遥感监测应用研究

APPLICATION OF REGIONALIZED REMOTE SENSING MONITORING TO GROWTH OF WHEAT SEEDLINGS UNDER GIS

在地理信息系统（ＧＩＳ）支持下，将处理好的归一化植被指数（ＮＶＩ）图与地形图、土壤质地图、政区图、年降水量图、年平均气温图、小麦生育期积温图等背景图件叠加，进行比较客观的小麦遥感生态分层，并制成常年非麦象元分布底图。在此基础上，根据地面监测网实地调查资料，建立了一套适合不同监测层的遥感监测指标。最后，将剔除常年非麦象元后的ＮＶＩ图与遥感生态区分层图进行集成，采用不同指标划分小麦苗情等级，从而提高了小麦苗情遥感解译精度。

Supported by GIS, maps were overlapped of normalized vegetation index (NVI), topograph, soils, government districts, yearly rainfall, yearly mean temperature, accumulated temperature during growing period of wheat, so as that ecological layers for wheat were stratified objectively and a base graph of non wheat image cell was plotted for average year. Based on investigations into data from monitoring networks on the ground, a set of indices were established for different layers with the aid of remote sensing. Finally, a NVI map excluding non wheat image cells and a stratified ecological map were integrated, from which the growth of wheat seedlings was graded according to the indices and the accuracy of monitoring was increased.