Method and apparatus for evaluating sand duststorm intensity
A sandstorm and intensity technology, applied to measuring devices, material analysis through optical means, instruments, etc., can solve the problems that cannot be fully adapted to the visibility analysis of various degrees of sand and dust weather, such as light and heavy
Inactive Publication Date: 2015-11-25
HITACHI LTD
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[0005] In order to solve the problem that the analysis of sandstorms based on remote sensing technology cannot fully adapt to the visibility analysis of mild and severe sandstorm weather, the present invention provides a method and device for evaluating the intensity of sandstorms. The method and device are based on remote sensing technology , not only can accurately assess the intensity of severe sandstorm areas, but also can accurately assess the intensity of light sandstorm areas
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[0047] The present invention will be described in detail below in conjunction with the embodiments.
[0048] figure 1 is a flowchart of a method for evaluating sandstorm intensity according to an embodiment of the present invention. In step S11, the satellite sensor is used to photograph the surface area to obtain an image of the surface area, the image includes a plurality of pixels, each pixel in the plurality of pixels has a gray value, and each pixel corresponds to a plurality of optical bands , each of the plurality of optical bands has a plurality of parameters. In this embodiment, the satellite sensor is MODIS, and the surface area is located, for example, at 88 degrees to 120 degrees east longitude, 31 degrees north latitude and 54 degrees north latitude, and the shooting time is 12:40 on April 23, 2009. The resolution of the image is 1000m, and the size of the image is 2277×2113 pixels. This surface area is mainly composed of cloud cover, bare surface (desert or lo...
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The present invention provides a method and an apparatus for evaluating the sand duststorm intensity. The method comprises: a) acquiring an image; b) obtaining the reflectivities and the emissivities of each pixel; c) obtaining the brightness temperatures of each pixel; d) taking the pixels corresponding to the sand duststorm region from the multiple pixels; e) calculating the normalization sand-dust indexes and determining whether each normalization sand-dust index is larger than or equal to the threshold, if yes, obtaining the corresponding level visibility and performing a step h), and if not, performing a step f); f) with a parameter inversion method, determining the quantitative inversion relationship, and determining the aerosol optical thickness; g) according to the determined aerosol optical thickness, obtaining the level visibilities corresponding to each pixel; and h) according to the obtained level visibility, determining the sand duststorm intensities of the regions corresponding to each pixel in the sand duststorm region.
Description
technical field [0001] The invention relates to the technical field of remote sensing image processing, in particular to a method and device for evaluating the intensity of sandstorms using satellite images, which are applicable to the field of environmental analysis and processing. Background technique [0002] With the development of information technology, remote sensing technology is increasingly used to obtain and analyze various information. Using remote sensing technology to monitor sandstorms has become the focus of research. [0003] At present, sandstorm monitoring and evaluation technologies mainly include ground network monitoring and satellite remote sensing monitoring. Since satellite remote sensing images can monitor a larger continuous spatial range, the spectral resolution is getting higher and higher, and more and more information can be extracted. Therefore, the technical research of using satellite remote sensing to monitor sandstorms has more important ...
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IPC IPC(8): G01N21/84
Inventor 张岱张学
Owner HITACHI LTD