新疆天山北坡典型研究区融雪期地物光谱特征分析

地物的波谱特性乃是整个遥感技术的物理基础,更是遥感技术应用尤其是定量遥感的基石。由于融雪期静态地物与冰-雪-水等动态地物交互存在,地物光谱特征更为复杂。选取了新疆天山北坡乌鲁木齐河流域以及军塘湖流域作为典型研究区,采用美国CID公司生产的CI700便携式野外光谱仪,通过2006年到2009年融雪期大量的野外调查和实地测量,获取了新疆天山北坡典型研究区融雪期典型地物包括各种积雪、冰、水以及土壤的光谱曲线及其变化规律,并对其进行了光谱特征分析。结果表明,融雪期虽然地物类型较为单一,但是因为积雪-冰-水-土壤复杂系统的交互式影响,地物的光谱特性及其变化均较为复杂,给融雪期地表参数的定量遥感研究带来了较大的挑战。对于融雪期复杂地物光谱的系列观测及特征分析无论是对于地物光谱特征基础研究还是定量遥感应用研究均具有重要意义。

Spectral Characters Analysis of Ground Objects in Snowmelt Period in the Northern Slope of Tianshan Mountains

Urumqi River Basin and Juntanghu Basin,located in the northern slope of Tianshan Mountains in Xinjiang,were selected as typical study areas.With the portable field spectrometer CI700 produced by CID in the United States and from a large number of field investigations and field measurements in the snowmeh period (usually starts in the end of February or the beginning of March,and goes on for many days) from 2006 to 2009,a variety of spectral curves and their variation of typical ground objects in the snowmelt period in the northern slope of Tianshan Mountains,such as snow,ice,water and soil,were obtained,and spectral characters analysis was carried out based on the collected data.The results showed that the classes of ground objects in snowmelt period are quite monotone,however,a great challenge was brought about to the quantitative remote sensing research on surface parameters in snowmelt period because of the interactive effects of the complex systems of snow-ice-water-soil,the spectral properties of typical ground objects,and their complex changes.Reflectance of soil with different moisture conditions is distinct,as well as reflectance of ice and snow under different environment or dissimilar mixtures have obvious development trends.The series of observations and analysis of the typical and complex spectral features in snowmelt period are of great significance for the fundamental study of objects' spectral characteristics,as well as for the application of quantitative remote sensing studies.