Detection method of saline-alkali land characteristics based on passive microwave hybrid pixel decomposition technology
A hybrid pixel decomposition and passive microwave technology, which is applied in the use of microwave means for material analysis, measurement devices, analysis materials, etc., can solve problems such as the lack of combination of optical and microwave remote sensing, and the inability to meet the application needs of saline-alkali land.
Inactive Publication Date: 2015-10-28
JILIN UNIV
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The research on the salt content of saline-alkali soil by means of microwave remote sensing is mostly preliminary. Therefore, the research in this field is mainly at the level of a single spectral remote sensing data source, and the combination of optical and microwave remote sensing has not been realized. Detection of saline-alkali characteristics in the observation area
The technical achievements made in remote sensing to detect the characteristics of saline-alkali land cannot meet the application requirements of saline-alkali land improvement
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Embodiment 1
[0089] The research area is located in the west of Jilin Province, which belongs to the southwest of Songnen Plain. The latitude and longitude range of the area: 121°38′-126°11′E, 43°59′-46°18′N, the area includes eight areas including Daan City, Zhenlai County, Tongyu County, with an area of about 4.7 million km 2 . Although salinized land is distributed throughout the region, the area and degree of development vary from place to place. The present invention uses MWRI passive microwave remote sensing data and MODIS 8-day synthetic surface reflectance data product, combined with the proposed saline-alkali land passive microwave mixed pixel decomposition method, to realize the detection of saline-alkali land characteristics in western Jilin Province, China in August 2011.
[0090] Specifically include the following steps:
[0091](1) Classification of ground objects in the observation area:
[0092] Download the 8-day synthetic surface reflectance data MOD09A1 of the medi...
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The invention discloses a saline-alkali soil characteristic detection method based on a passive microwave mixed pixel decomposition technology, belonging to the technical field of remote sensing image processing. The saline-alkali soil characteristic detection method comprises the steps of obtaining ground object categorical data in an observation region through spectrum remote sensing data, establishing a passive microwave mixed pixel decomposition model specific to a saline-alkali-soil type; solving an equation set by adopting a non-negative least square method with a constraint condition to realize passive microwave mixed pixel decomposition of the saline-alkali soil; and further establishing a decomposed passive microwave remote sensing data and saline-alkali soil salt content relation model to realize effective detection of a saline-alkali soil characteristic. The invention provides a theoretical method and a technical means for deeply researching the correlation of moisture and salt content characteristics and wave spectrum information of the soda saline-alkali soil, and correlation of conduction characteristics and microwave radiation / scattering information of the soda saline-alkali soil, holding a grown form, a spatiotemporal dynamic changing process, an evolvement rule and geographical distribution characteristics of the soda saline-alkali soil, and improving and reasonably utilizing the soda saline-alkali soil.
Description
technical field [0001] The invention belongs to the technical field of remote sensing image processing. By utilizing the advantages of optical and microwave remote sensing in the identification of saline-alkali land, a saline-alkali land characteristic detection method based on passive microwave mixed pixel decomposition technology is proposed. The process, evolution law and geographical distribution characteristics, as well as the improvement and rational use of saline-alkali land, provide theoretical methods and technical means. Background technique [0002] Soil salinization is the main land degradation problem in arid and semi-arid areas, and it is one of the main problems of land desertification today. As an environmental disaster, land salinization leads to land degradation, which weakens and destroys land productivity, reduces grain production in agricultural areas, and seriously threatens the sustainable development of ecology and national economy. Traditional field...
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IPC IPC(8): G01N22/00
Inventor 顾玲嘉任瑞治张爽
Owner JILIN UNIV