Title :
Remote sensing applications to the analysis of urban microclimates
Author :
Dousset, Bénédicte ; Gourmelon, Françoise
Author_Institution :
Hawaii Inst. of Geophys. & Planetology, Univ. of Hawaii, Honolulu, HI, USA
Abstract :
Summertime microclimates of Paris and Los Angeles are analyzed in order to better understand the physical processes that determine the energy fluxes and their interaction at the urban surface. Statistical images are extracted from time series of NOAA-AVHRR thermal IR images. They reveal distinct temporal and spatial microclimates characteristics. Fractional images of land-cover classification are constructed from multispectral SPOT images, using GIS systems. This data fusion shows: 1) the influence of land-cover, especially in downtown business and industrial districts that display heat-islands larger than 8°C; 2) the temperate effect of water; 3) the negative correlation between afternoon surface temperatures and fractional vegetation index, which confirms the cooling effect of urban parks
Keywords :
atmospheric temperature; image classification; pollution; remote sensing; sensor fusion; GIS systems; Los Angeles; NOAA-AVHRR images; Paris; afternoon surface temperatures; data fusion; downtown business districts; energy fluxes; fractional vegetation index; heat island; industrial districts; land-cover classification; multispectral SPOT images; spatial microclimate characteristics; statistical images; summertime microclimates; temporal microclimate characteristics; urban parks; urban surface; Atmosphere; Data mining; Geographic Information Systems; Ocean temperature; Remote sensing; Satellite broadcasting; Sea measurements; Sea surface; Thermal conductivity; Vegetation mapping;
Conference_Titel :
Remote Sensing and Data Fusion over Urban Areas, IEEE/ISPRS Joint Workshop 2001
Conference_Location :
Rome
Print_ISBN :
0-7803-7059-7
DOI :
10.1109/DFUA.2001.985868
