Method for Discriminating Snow in Qilian Mountain Region Based on MODIS Data

J4 ›› 2007, Vol. 25 ›› Issue (2): 29-34.

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Method for Discriminating Snow in Qilian Mountain Region Based on MODIS Data

WANG Xing ^1，2，ZHANG Qiang ²，GUO Ni ²，CAI Dihua²

1．Chi~se Academy ofMeteorological Sciences，CMA，Beijing 100081，China；2．Institute ofAridMeteorology，CMA，Key LaboratoryofArid Climatic Change andReducingDisasterofGansuPr~ince，Key Open Laboratory ofArid Climate Change and Disaster Reduction ofCMA，Lanzhou 730020，China

Received:2007-03-20 Revised:2007-05-14 Online:2007-06-30 Published:2007-06-30

利用MODIS数据判识祁连山区积雪方法研究

王兴^1，2，张强²，郭铌²，蔡迪花²

1．中国气象科学研究院，北京100081；2．中国气象局兰州干旱气象研究所，甘肃省干旱气候变化与减灾重点实验室，中国气象局干旱气候变化与减灾重点开放实验室，甘肃兰州730020

作者简介:王兴(1982一)，女，在读硕士生，主要从事积雪遥感方面研究．E—mail：shatha@sina．conl
基金资助:
“西北开发科技行动”重大项目“祁连山空中水资源开发利用研究”(2004BA901A16)及中国气象局兰州干旱气象研究所“利用ASAR和MODIS数据监测研究祁连山区积雪资源”项目资助

Abstract

Abstract:

By analyzing spectrum characteristics of snow，clouds and diferent land covers in the Qilian Mountain region based on MO-DIS data from July 2003 to March 2005，a new method for snow discrimination is presented on the basis of former researches，which combined NDSI(Normalized Diference Snow Index)and band 18，band 3 1 of MODIS to discriminate snow from clouds，saline，ice，desert，etc．with a step—by—step approach．Both result analysis and examination show that snow in the Qilian Mountain region canbe efectively discriminated by the method of this article．

Key words: the Qilian Mountain, snow, NDSI, brightness temperature, step—by—step approach

摘要：

对祁连山区积雪、云和各种下垫面进行光谱分析，利用2003年7月至2005年3月的MODIS数据资料，在前人所做研究工作的基础上提出利用归一化差值积雪指数NDSI(Normalized Diference Snow Index)和中分辨率成像光谱仪(Moderate Resolution Imagigng Spectroradiometer)的band 18和band 31的结合，采用逐步逼近法去除大部分云、盐湖、冰面、沙漠、戈壁等对积雪判识的干扰，从而判识出祁连山区积雪。由结果分析和检验显示，利用本文方法可以比较有效识别出祁连山区积雪

关键词: 祁连山, 积雪, NDSI, 亮温, 逐步逼近法

CLC Number:

P407．8

WANG Xin, ZHANG Jiang, GUO Ni, CA Di-Hua. Method for Discriminating Snow in Qilian Mountain Region Based on MODIS Data[J]. J4, 2007, 25(2): 29-34.

王兴, 张强, 郭铌, 蔡迪花. 利用MODIS数据判识祁连山区积雪方法研究[J]. J4, 2007, 25(2): 29-34.

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Method for Discriminating Snow in Qilian Mountain Region Based on MODIS Data

利用MODIS数据判识祁连山区积雪方法研究

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