摘要
野外波谱测量看起来比较简单:通过同时观测目标和参考板的反射能量的对比来完成。但是不同的波谱测量方式,同一目标会产生不同的测量波谱,无法回答哪个是最接近目标波谱物理性质。主要问题是正确的波谱测量方式是保持被测目标和参考板的光照条件、背景环境等要素要完全一致,但是有时无法保持完全一致,如河流水体波谱的测量等;另外对于采集下的植被叶片的波谱测量,叶片随时间变化测量结果差异很大,问题是活体的叶片内部结构随时间产生变化。本文给出了不同测量方式,不同环境背景和不同时间下同一目标波谱的测量结果,这些波谱的对比分析对深刻理解野外波谱测量数据、改进测量方法的设计有很大帮助。
Field spectrometry mainly compares the reflectance between objects and standard board. It seems to be easy, but, because of the differences of spectrometry method, the different results will be gained. It is hard to tell which one is accurate. The key point of spectrometry is to keep the object and standard board in the same condition of solar radiation, background, environment and ~ forth. But it isn＇t always so, such as river spectrometry. In addition, we can＇t climb up a high tree for spectrometry, the method we often use is to pick up leaves and measure them in lab, what will cause the changes of inner structure of leaves, because of delay of time. The spectrometry results of same target under above mentioned conditions are provided. Comparing and analyzing these data are favor the deep understanding of field spectrometry and the improvement of its method of measurement.
出处
《遥感信息》
CSCD
2006年第1期29-33,共5页
Remote Sensing Information
基金
国家自然科学基金(40471094)
国家高技术研究发展计划(863计划)(2002AA130010)
国家重点基础研究发展规划项目(G20000779)
国家重大工程项目塔里木河流域水量调度管理系统(20041040)
关键词
野外波谱测量
光照环境
目标背景环境
时间
field spectrometry
condition of solar radiation
background of object
time
