A method for extracting vegetation information of Urban underlaying surface oriented to ECO-environmental quality assessment

摘要

In the traditional classification method, for the pixels, which the proportion of vegetation distribution is small, that is, the area occupied by vegetation in the pixel is less than half a pixel, they are often considered as a non-vegetation area. Such problems, in the highly developed cities, are the most common. Therefore, in order to more accurately compute the highly developed, especially hardened urban underlying surface, in this study, a new method for estimating vegetation area was proposed. The main urban area of Beijing was chosen as the study area, and the 1km grid was used as the evaluation unit. Finally, we calculated the urban development intensity index and analyzed the effectiveness of the new method of vegetation area extraction in practical application. The results show that, compared with the traditional classification methods, the index model can significantly improve the accuracy of urban vegetation information extraction and can effectively extract the information of urban underlying surface vegetation information, reflecting the intensity of urban development, and provide technical support for ecological environmental quality assessment.