【摘要】 <正> 为了探讨在我国目前条件下利用航空多光谱摄影手段遥感水深的可能和方法,在1978年10月至1979年10月的约一年时间里,国家海洋局第二海洋研究所遥感技术研究室先后在我国云南保山地区、吉林长春地区以及东海三大王海湾进行了三次水深航空多光谱摄影的遥感试验研究.本论文试图根据这三次试验的实践,阐述利用航空多光谱摄影遥感水深的原理和方法,估价在我国目前条件下所能达到的限度,讨论今后的研究方向和改进办法.更多还原

【Abstract】 Starting from the three tests of aerial multispeetral sensing at the Dahaizi reservoir, reservoirs near Changchun district and Sandawang Bay, the authors explain systematically in this paper the basic principle and the method of remote sensing for determine water depth using aerial multispectral photography. On the basis of basic principles of geometric, physical and water optics, and foreign data, we propose a depth equation with the effect of forward scattering on light radiation transmission considered,expound the specific physical significance of various parameters in the equation, and establish the respective method of measurement or estimation. According to the remote sensing instruments and equipment of our country, we mainly demonstrate each major step and concrete method associated with the determination of water depth by the single spectral channel ratio technique in aerial remote sensing, for example, the selection of best waveband, the flying conditions and the requirements for image processing, and so on. Special attention has been paid to discussion on the concept of the perspective depth and its estimation methods, the experimental approach to correcting the aerial image for radiance, the approximate measurement of the diffusion attenuation coefficient in waters, and the processings of image contrast enhancement and isodensity slicing. Finally, on the basis of foreign theoretical estimation and their data measured in situ, the possibility of water depth determination by the single spectral channel ratio analysis technique of aerial multispectral photography is discussed, and the depth by remote sensing and the accuracy reached are also estimated. Owing to our limitations of instruments, equipment and technique levels in remote sensing,the results obtained are preliminary. So, in aerial multispectral sensing for water depth, it is necessary to create favourable conditions so as to further make use of the analysis technique of multispectral ratio and the image machine-processing method.更多还原