关键词: NDVI, 监测变化, 绿地

Abstract: This paper used normalized difference vegetation index (NDVI)derived from SPOT HRV multispectral data to study the environment of Hong Kong and its changes from 1987,1991,1993 to 1995. Using conven-tional change detection techniques such as image differencing or principal components analysis helped to high-light salient changes. Integrating the NDVI value at the tertiary planning unit (TPU) level with census and land cover data showed that the NDVI value was related to woodland, tall scrubland and urban land . It was also related to crowdedness as depicted from a factor analysis of census data. Tracing the changing pattern of NDVI revealed that a consistent increase in NDVI value only scattered around various districts within the city whereas a consistent decrease was shown in a large part of "New Territories "and western Hong Kong Island. This would provide valuable information for environmental planning and management.

Key words: NDVI, change detection, green space