A remote sensing-based method for extracting forest and grass vegetation information in soil and water loss areas of the Loess Plateau

Abstract

The invention provides a remote sensing-based method for extracting forest and grass vegetation information in a soil erosion area of ​​the Loess Plateau. Including: S1: Extract land use data in different periods of soil erosion areas; S2: Extract data of terraced fields and rocky mountainous areas in different periods of soil erosion areas; S3: Extract data of normalized difference vegetation index in different periods of soil erosion areas; S4: Eliminate cultivated land and terraced fields , towns and villages, rivers, waters, and rocky mountainous areas to obtain the spatial location and area of ​​forest and grassland in different periods; S5: Obtain the vegetation coverage of forest and grassland in soil erosion areas in different periods; S6: Analyze the obtained forest and grass vegetation coverage data verify. The invention does not rely on statistical data and avoids the overlapping problems of terraced fields and forest and grass vegetation; it is more detailed in classification of vegetation coverage than in the past; it strips away information such as earth and rock mountains, urban and village land, river land, and water areas that have little impact on water and soil erosion. Accurately obtaining forest and grass vegetation information in soil erosion areas on the Loess Plateau can scientifically evaluate the important role of forest and grass vegetation in reducing water and sediment in different periods.

Description

technical field [0001] The invention belongs to the technical field of environmental remote sensing, and relates to a technology for collecting and processing forest and grass vegetation information on the Loess Plateau, in particular to a method for extracting forest and grass vegetation information in soil and water loss areas on the Loess Plateau based on remote sensing. Background technique [0002] The topography of the Loess Plateau is complex, the topography is broken, and the soil erosion is serious, which is directly related to the change of water and sediment in the Yellow River Basin. Vegetation is an important factor affecting watershed hydrological processes and soil erosion. On the one hand, soil infiltration and surface runoff are affected by changes in surface cover type and coverage, thereby affecting the regional hydrological cycle; on the other hand, changes in vegetation can also affect soil erosion and sediment transport in watersheds. Therefore, vegeta...

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Problems solved by technology

[0006] However, in general, the application of the above-mentioned forest and grass vegetation information based on satellite remote sensing data to the analysis of soil and water loss in the Loess Plateau still has several shortcomings: First, the results of vegetation coverage extracted based on remote sensing technology do not exclude the crops on the cultivated land , and the area information of forest and grassland cannot be obtained

The second is the forest and grass vegetation information in the land use data obtained by remote sensing. Although the forest and grassland areas of different coverage levels are included, the vegetation coverage is only high, medium, and low. The coverage classification is too extensive to meet the requirements of loess. The need for the analysis of plateau soil erosion and the change of water and sediment in the Yellow River

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