2018-11-16学习笔记 读论文Advantages of high quality SWIR bands for ocean colour processing: Examples from
2018-11-17 17:20
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Advantages of high quality SWIR bands for ocean colour processing:
Examples from Landsat-8
FROM RSE
Quinten Vanhellemont ⁎, Kevin Ruddick
1.introduction
通常,对于MODIS Aqua数据的SWIR校正
使用1240nmand 2130nmband,因为1640nmband有一些坏掉的探测器。本文提出了一种利用L8/OLI的SWIR波段对极端混浊水体进行大气校正的自动方法。
2.方法
VR-NIR方法
VR-SWIR方法
不为水的像元:
Aerosol type (ε)
这种简单的阈值方法在世界范围内都能很好地区分水和漂浮物、近海建筑、陆地和云层,即使在非常浑浊的水域中也是如此。但是较难区分云和山的阴影。阈值可以根据图像来定义,可能需要根据不同的区域进行调整。
VR-SWIR(6,7)方法还应用于每个场景固定(F)和每个像素变量(V)气溶胶类型,因为可以假设所有水像素在SWIR波长(1609和2201nm)均为黑色。
使用两个SWIR波段(6,7)的优点之一是,在气溶胶类型选择之前不需要选择clearwater像素,因为这两个波段都假定对海洋贡献为零
通过将数据约束到像素,选择清水像素:
3. results
3.1 red-NIR和SWIR方法的有效性范围
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