基于多源卫星的青藏高原湿雪判识算法研究

Reasons of poor accuracy of remote sensing products at home and abroad in the Qinghai-Tibetan plateau are as follows: (1) Complex of Topography in this region and strong radiation; (2) Climate variance in northern part and southern part in the Qinghai-Tibetan; (3) Frequently change and serious fragmentation of dry and wet snow.This study intends to choose typical area of wet snow distribution on the basic of on the climatic regionalization map of China to develop snow cover retrieval algorithm of different snow state moisture through moisture spectral curve of different snow state to set up statistical model of snow cover sensitive parameter and snow cover moisture by using mult-source remote sensing data and mature algorithm based on field test and observation spectrum in special region in the Qinghai-Tibetan Plateau. .The accuracy of snow parameter inversion can be improved effectively using high spatial resolution and high temporal resolution of optical remote sensing data on static satellite can overcome characteristics of cloud interference with continuous improvement of satellite and sensor technology and spatial resolution of optical remote sensing data. Meanwhile, this study want to solve poor accuracy problems of popular snow products at home and abroad, establish foundation for accurate evaluation of snow cover change and provide more accurate input factors for hydrological and land surface model.

青藏高原地区地形复杂，气候南北差异大，辐射强，干湿雪转化频繁，进而引起雪粒径、雪密度等积雪特性变化，传统积雪算法大多建立在干雪机理基础上，是造成目前国内外主流的积雪遥感产品在该地区精度较差的主要原因。本项目拟利用多源遥感资料，借鉴现有成熟的算法，在中国气候区划图基础上，选择湿雪分布典型区域，在野外试验、人工控制实验及光谱观测的基础上，通过分析不同积雪状态含水率光谱曲线，建立积雪含水率与敏感积雪参数和气象因子统计模型，发展面向青藏高原特殊区域的不同积雪状态含水率的湿雪判识算法，随着国内外卫星和传感器技术在不断进步，光学遥感数据空间分辨率大幅提高，综合利用静止卫星光学遥感数据高空间分辨率和高时间分辨率可以有效克服云干扰的特点，为准确评价青藏高原积雪变化奠定基础，同时为水文、陆面模型提供更准确的输入因子。

青藏高原地区地形复杂，气候南北差异大，辐射强，干湿雪转化频繁，进而引起雪粒径、雪密度等积雪特性变化，传统积雪算法大多建立在干雪机理基础上，是造成目前国内外主流的积雪遥感产品在该地区精度较差的主要原因。本项目拟利用多源遥感资料，借鉴现有成熟的算法，在中国气候区划图基础上，选择湿雪分布典型区域，在野外试验、人工控制实验及光谱观测的基础上，通过分析不同积雪状态含水率光谱曲线，建立积雪含水率与敏感积雪参数和气象因子统计模型，发展面向青藏高原特殊区域的不同积雪状态含水率的湿雪判识算法，随着国内外卫星和传感器技术在不断进步，光学遥感数据空间分辨率大幅提高，综合利用静止卫星光学遥感数据高空间分辨率和高时间分辨率可以有效克服云干扰的特点，为准确评价青藏高原积雪变化奠定基础，同时为水文、陆面模型提供更准确的输入因子。