基于Landsat8遥感数据的西沙群岛永乐环礁底质分类与变化分析

李天驰, 王道儒, 赵亮, 凡仁福

Classification and change analysis of the substrate of the Yongle Atoll in the Xisha Islands based on Landsat8 remote sensing data

LI Tianchi, WANG Daoru, ZHAO Liang, FAN Renfu

表2 不同分类方法精度对比

Tab.2 Comparison of accuracy of different classification methods

底质类型 面向对象 基于像元 决策树分类 SVM KNN 决策树分类 SVM MDC UA/% PA/% UA/% PA/% UA/% PA/% UA/% PA/% UA/% PA/% UA/% PA/% 礁坪 83.79 75.17 87.83 70.46 85.42 71.01 77.56 76.75 87.47 72.60 84.41 61.78 礁前斜坡 86.69 83.56 84.97 72.95 81.92 74.70 86.43 79.39 72.92 85.92 85.72 72.97 点礁 74.34 75.02 44.08 73.04 42.98 57.32 71.27 67.51 38.61 70.04 45.37 51.93 建筑和植被 91.35 71.84 84.32 75.76 83.47 75.97 90.34 69.28 85.06 78.06 83.96 78.87 沙洲 71.84 69.16 67.75 68.01 66.36 67.34 56.22 62.09 60.23 78.42 43.46 77.72 珊瑚丛生带 47.15 74.43 40.53 71.75 38.11 67.65 42.57 59.24 39.58 64.14 28.54 66.22 OA/% 77.33 71.69 70.64 74.25 71.14 66.07 Kappa系数 0.681 0.614 0.595 0.631 0.594 0.541