A method of monitoring the extent and intensity of dust-covered areas
A technology covering areas and dust, applied in the field of meteorology, can solve the problems of accurately describing the range and intensity of dust, confusing cloud areas and dust, and unable to express sand and dust intensity information, so as to achieve simple operation and improve observation Accuracy, enhanced recognition effect
Active Publication Date: 2017-01-18
BEIJING NORMAL UNIVERSITY
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Problems solved by technology
This method can effectively describe the range of dust and reduce the confusion between bare land and dust to a certain extent. However, with the increase of the spatial concentration of sand and dust, the BTD value calculated within a certain threshold range is saturated and cannot be expressed. Dust Intensity Information
[0005] In addition, the predecessors also found that there is a good linear relationship between the spatial concentration of sand and dust particles and the brightness temperature difference between the wavelengths of 3.75um and 1.06um. Solve the problem of accurately describing the range and intensity of sand and dust
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[0034] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.
[0035] like figure 1 As shown, the method for monitoring the scope and intensity of the dust-covered area provided by the present embodiment includes the following steps:
[0036] 1), download the time of the area to be monitored, the L1B data of MODIS within the spatial range (this data can come from the MODIS web site of NASA);
[0037] 2) Extract the brightness temperature values of the MODIS B20, B31 and B32 bands in the L1B data of MODIS through the built-in module of the remote sensing software. You can load the m...
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The invention discloses a method for monitoring ranges and strength of a sand covering region. The method comprises the following steps of (S1) downloading MODIS (moderate resolution imaging spectroradiometer) data in time and space ranges of a region to be monitored; (S2) extracting brightness temperature values of wave bands B20, B31 and B32 in the MODIS data; (S3) calculating sand indexes according to the brightness temperature values; and (S4) determining that regions of which the sand indexes are greater than a limit value are the sand covering regions. The sand strength in the sand covering regions is linearly increased along with increasing of the sand indexes. By the technical scheme, capability of recognition on other ground objects can be improved, the observation accuracy of the ranges of the sand covering regions is improved, and sand space concentration of the sand covering regions can be expressed linearly.
Description
technical field [0001] The present invention relates to the field of meteorology. More specifically, it relates to a method of monitoring the extent and intensity of dust-covered areas. Background technique [0002] Sand and dust weather can be divided into blowing sand, sandstorm and strong sandstorm according to its intensity. [0003] Strong winds blow up a large amount of sand and dust on the ground, making the atmosphere turbid, and the disastrous weather phenomenon with horizontal visibility less than 1 km is called a sandstorm. Sandstorm is not only a disastrous weather phenomenon, but also has important ecological significance. Dust plays an obvious role in the biochemical cycle, and can be used as a medium to carry bacteria, fungi, viruses, seeds, etc. for long-distance migration. The particulate matter of dust contains a large amount of fine-grained nutrients. The process of dust weather is the process of redistribution of soil minerals and organic matter. [...
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IPC IPC(8): G01W1/02
CPCG01W1/02
Inventor 岳桓陛何春阳许敏李经纬
Owner BEIJING NORMAL UNIVERSITY