Title :
Environmental quality and changes: a view from NDVI in Hong Kong
Author_Institution :
Dept. of Geogr., Chinese Univ. of Hong Kong, Shatin, Hong Kong
Abstract :
Normalized difference vegetation index (NDVI) has been a common tool for the studies of vegetation vigor and multitemporal land cover changes. While it can reflect these on a per-pixel basis, aggregating NDVI on planning units allows the author to study environmental quality and changes in terms of the amount and condition of vegetation and green space in a city. In this study, NDVI images were extracted from multitemporal SPOT images from 1987 to 1995 in Hong Kong. NDVI mean values were aggregated at the tertiary planning unit (TPU) level and studied. They are highly associated with high NDVI features such as woodland and high scrub. They have a high correlation with crowdedness within the city. TPU of constant increase and decrease in NDVI mean values reveal the effect of new landscape design and the pressure of urban encroachment respectively
Keywords :
geophysical techniques; pollution measurement; remote sensing; AD 1987 to 1995; China; Hong Kong; NDVI; city; crowding; environmental quality; forest; geophysical measurement technique; green space; land cover change; land surface; land use; landscape; multitemporal SPOT image; normalized difference vegetation index; optical imaging; remote sensing; scrub; terrain mapping; tertiary planning unit; urban area; vegetation mapping; woodland; Cities and towns; Concrete; Environmental economics; Geography; Government; Heart rate variability; Image analysis; Land vehicles; Remote monitoring; Vegetation mapping;
Conference_Titel :
Geoscience and Remote Sensing, 1997. IGARSS '97. Remote Sensing - A Scientific Vision for Sustainable Development., 1997 IEEE International
Print_ISBN :
0-7803-3836-7
DOI :
10.1109/IGARSS.1997.615272
