Abstract:

Traditional research methods on vegetation cover change in nature reserves mainly rely on remote sensing image data of a single time point, which is difficult to capture the spatial and temporal characteristics of vegetation cover comprehensively, and the results are susceptible to noise interference and lack of accuracy. Therefore, a method based on temporal NDVI map database was proposed to study the spatial and temporal characteristics of vegetation cover change in nature reserves. Firstly, by integrating multi-time point remote sensing data, the temporal NDVI map database was constructed. Based on the map database, the relevant data of vegetation coverage were extracted, and the coverage was calculated and classified. On this basis, using the methods of time series analysis, spatial pattern analysis and spatial and temporal dynamic change analysis, combined with the coverage level, the spatial and temporal characteristics of vegetation cover change in nature reserves were fully revealed. The results showed that this method can effectively reflect the temporal and spatial characteristics of vegetation cover change in protected areas, and the error between vegetation cover and measured data is controlled within 0.3%, which has a high accuracy in reflecting vegetation cover.

Key words: temporal NDVI map library, nature reserve, vegetation cover, change, spatial and temporal characteristics