A Method for Obtaining Spatial Distribution of Desert Riparian Forest Based on GIS Buffer Analysis

Abstract

The invention discloses a method for obtaining spatial distribution of desert riparian forests based on GIS buffer analysis, and belongs to the technical field of vegetation remote sensing monitoring in arid regions. It includes the following steps: Step 1: Download the TM remote sensing image of the river in the arid area, perform image preprocessing, remote sensing interpretation, and NDVI calculation on it, and obtain the NDVI remote sensing data of the desert riparian forest; Step 2: Extract the river bank boundary vector line, and remote sensing The images are uniformly registered and corrected under the GIS platform; Step 3: Generate multiple buffer vector maps around the river according to the research requirements; Step 4: Overlay the multiple buffer vector maps with the NDVI remote sensing data of the desert riparian forest, and extract each The mean value of NDVI in the buffer zone, with the vertical channel distance as the independent variable and the mean NDVI as the dependent variable, was used to analyze the horizontal spatial distribution structure of desert riparian forest by curve fitting. The invention provides a beneficial reference for determining the spatial continuous gradient distribution of the desert riparian forest and its protection range.

Description

technical field [0001] The invention relates to the technical field of remote sensing monitoring of vegetation in arid regions, in particular to a method for obtaining spatial gradient distribution of desert riparian forests based on GIS (Geographic Information System) buffer analysis. Background technique [0002] Desert is an important geographical landscape in the western arid region. It forms a special coupling relationship with mountains and oases in the arid region, and constitutes the core content of the mountain basin system in the western arid region. Among them, the desert riparian forest ecosystem that lives on water is the natural protection system of the oasis system, which is of great significance to the coordinated development of deserts, mountains and oases. Desert riparian forest is a unique landscape of arid inland river basins, also known as dugayilin. It is concentrated along the banks of inland river basins in arid areas. It mainly depends on groundwater...

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Problems solved by technology

However, the research is limited to the data of some monitoring points. On a large scale, there are few analyzes on the continuous gradient spatial distribution of desert riparian forests and the determination of the scope of river water influence (Bai Yuan, Xu Hailiang, Liu Xinhua, et al. Tarim River mainstream desert Spatial distribution and ecological protection of riparian forests [J]. Journal of Natural Resources, 2013, 28(5):776-785.), and there is also a lack of corresponding efficient and convenient gradient spatial distribution information extraction and analysis methods

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