Microwave Remote Sensing
Microwave Remote Sensing
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DOI：
10.1007/978-3-030-03017-9_9
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
J. Awange;J. Kiema
中科院分区：
文献类型：
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作者：
J. Awange;J. Kiema
持续的云层，特别是在热带地区，从太空中只能有限地清晰地看到地球表面。这对第八章讨论的光学遥感在提供全球遥感复盖面方面的应用构成了一个重大障碍。此外，除了热传感器，大多数其他光学成像技术最好在阳光充足的白天运行。电磁波谱的微波区域是一个主要的大气窗口，可用于克服光学遥感中的上述限制。例如，鉴于微波的波长要长得多，而且与光学传感器相反，微波可以很容易地穿透植被树冠，甚至干燥的土壤。此外，微波系统为用户提供了对要应用的入射微波能量的特性的更多选择和控制。此外，即使在下雨或能见度低的情况下，它们也可以全天候运行。
Persistent cloud cover, especially within the tropics, offers limited clear views of the Earth’s surface from space. This presents a major impediment to the application of optical remote sensing discussed in Chap. 8 in providing global remote sensing coverage. Moreover, other than thermal sensors, most other optical imaging technologies best operate during day time when there is sufficient sunlight. The microwave region of the EM spectrum represents a principal atmospheric window that can be employed to overcome the above limitations in optical remote sensing. For instance, in view of their much longer wavelengths and contrary to optical sensors, microwaves can easily penetrate through vegetation canopies and even dry soils. In addition, microwave systems offer the user more choice and control over the properties of the incident microwave energy to be applied. Furthermore, they can be operated round the clock even under rainy or poor visibility conditions.