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两种热带森林覆盖变化检测方法比较研究

Keywords: 柬埔寨 热带森林变化 遥感检测

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Abstract:

[目的] 以热带森林复杂区域为对象, 对两种缨帽变换"衍生数据"检测热带森林变化的方法的优劣进行比较。[方法] 对两期数据进行缨帽变换, 同时结合黑暗对象掩膜与局部直方图阈值提取等方法, 获取亮度、绿度、湿度指数组合(MKT)和干扰指数(DI)。采用MKT差值(MKT-D)、干扰指数差值(MDI-D)进行变化信息识别, 然后, 根据植被覆盖与亮度、绿度、湿度之间的变化关系, 通过决策树分类提取变化信息, 最后, 对不同检测结果进行验证与比较分析。[结果] 结果显示两种方法都能检测出森林内部的细微变化, 但对小图斑变化, MKT-D检测优势明显, 且MKT-D的kappa系数为0.763 0, MDI-D的kappa系数为0.655 9, 两者相比, MKT-D方法优于MDI-D方法。[结论] MKT能够增强短波红外与近红外波段对森林变化信息的敏感性, 有效地消除噪声等非目标信号, 突出目标信号, 此外, MKT-D为RGB彩色图像, 更利于变化信息的目标提取与解译

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