基于ASTER数据的近海水产养殖区提取方法

Offshore aquatic farming areas extraction method based on ASTER data

随着海洋遥感技术的迅速发展,利用各种遥感数据获取近海养殖信息,并研究近海养殖对海洋环境和渔业的影响,对合理开发海洋资源和保护海洋生态环境具有十分重要的意义。该文以山东省烟台市的邻近海域作为研究区,根据研究区ASTER遥感影像的光谱特征,首先构建一个水体指数,用于提取近海水产养殖区域;再构建一个波段运算函数,从整个海域中分离出与水产养殖区光谱接近的深海水域;将两次运算的结果相结合,得到消除了深海水域影响的近海水产养殖区域。精度评价结果表明:利用该研究提出的信息提取方法得到的水产养殖区域与实地调查结果基本一致,总体精度为86.14%,从而使该方法可有效为养殖决策提供信息依据。

With the development of RS technology,there is an important significance for exploiting the marine resources reasonably and protecting the marine ecological environment by using remote sensing data to obtain the information of offshore aquaculture,and studying the effects of offshore aquaculture.Taking the adjacent waters of Yantai City,Shandong Province as the study area,according to the spectrum characteristics of the image,a water index was constructed to extract offshore aquaculture area firstly.Then,the deep water was extracted which had similar spectrum with aquaculture area.Finally,combining the results of the two operations,the aquaculture area was isolated from the deep water.Accuracy evaluation results show that the extracted aquaculture area by using this method and on-the-spot investigation results are basically the same.The overall accuracy reached 86.14%.Thus,this method can effectively provide information basis for the farming decision.