【作者】 孙立娥； 崔廷伟； 秦平； 崔文连；

【Author】 Li’e Sun;Tingmi Cui;Ping Qin;Wenlian Cui;First Institute of Oceanography,State Oceanic Administration;Qingdao Environment Monitoring Center;Ocean University of China;

【机构】 国家海洋局第一海洋研究所； 青岛市环境监测中心站； 中国海洋大学；

【摘要】 本文利用HJ-1 CCD数据,研究了卫星光学遥感数据的大气校正与否和归一化差值植被指数(ND VI,Normalized Difference Vegetation Index)阈值选取对绿潮面积遥感提取精度的影响。研究发现:(1)大气校正后,绿潮和海水混合样本区的标准差较校正前变大,更有利于绿潮信息提取;(2)绿潮面积随NDVI阈值的变化基本呈线性关系,所选8景影像的拟合斜率在0.47-8.91之间,阈值变化引起的绿潮提取面积变化在12%~40%之间,因此,如何选择合适的阈值对于准确提取绿潮面积至关重要。更多还原

【Abstract】 Based on HJ-1 CCD data,the influence of whether atmospheric correction carried out or not and NDVI threshold selection on the green tide area extracted precision of remote sensing was studied.The results indicate that(1) The NDVI standard deviation values of green tide and seawater mixed sample area increase after atmospheric correction which is beneficial to extracting green tide information.(2)Green tide area and NDVI threshold display linearity.The slopes obtained from 8 images range in 0.47-8.91.Green tide area changed by 12%~40%due to NDVI threshold changed.Therefore,how to choose a suitable threshold is very important to accurately extract the green tide area.更多还原