福建沿海防护林资源的卫星遥感监测

A Study on Monitoring of Littoral Shelter Forest by Remote Sensing in Fujian

以2006年10个时相的晴空MODIS遥感数据为信息源,根据植被对MODIS遥感数据的反射光谱特征和沿海防护林的生长特点,选用归一化植被指数NDVI作为指标来增强沿海防护林与旱地和居民地的差异,并重点分析这三种典型地物的NDVI随时间变化情况,在此基础上选择训练样区,采用监督分类方法提取福建沿海防护林信息,分类后参考2005年福建省CBERS-2遥感影像对分类结果中明显错误的地方进行修正,最后得到沿海防护林的分类总精度为79.67%,Kappa系数为0.7625。研究结果表明:应用MODIS遥感数据,通过人机交互解译来监测福建沿海防护林资源是切实可行的,分类统计结果显示2006年福建沿海防护林面积约为33.6万hm2。

Taken ten orbit MODIS images in 2006 as data source, normalized difference vegetation index NDVI chosen on the basis of a analysis of reflected spectrum characteristics on vegetation by MODIS data, and the results analyzed of the MODIS-NDVI variational curve of three different ground types, such as shelter forest, drought land and residential area in Fujian coastal regions, the littoral shelter forest information of Fujian was extracted. The training areas based on the characteristics of the MODIS-NDVI variational curve of three different ground types had been cho- sen, and the littoral shelter forest information of Fujian have been distilled by supervised classification. Taking the remote sensing image of CBERS-2 of Fujian in 2005 as reference, the error results of shelter forest monitored using MODIS data had been corrected. The overall classifi- cation accuracy of littoral shelter forest area in Fujian was 79.67% , and kappa index was 0. 7625. The results showed that the human-computer interactive interpretation method to monitor the littoral shelter forest information of Fujian by using MODIS data was valid. The area of littoral shelter forest of Fujian in 2006 was about 336000 ha according to remote sensing monitoring.