Use of Geographical Imformation System to Study the Epidemiology of Dengue Haemorrhagic Fever in Thailand.
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WHO Regional Office for South-East Asia
Abstract
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Dengue Bulletin. 1997 Dec;21:68-73.
A Geographical Information System (GIS) was used to study the spatial distribution of dengue haemorrhagic fever (DHF) in Thailand. The National Oceanic and Atmospheric Administration (NOAA) satellite data, with a spatial resolution of 1 km, were used to produce a land cover map and calculate the percentage of forest cover in each province of Thailand. GIS was used as an analysis tool to map the distribution of DHF by creating overlays of epidemiological and digitized province data on a NOAA normalized difference vegetation index image of Thailand. The countrywide GIS database demonstrated that DHF incidence was not correlated to the area of forest cover in the provinces of Thailand. Global Positioning System (GPS) instruments were used to map villages involved in dengue epidemiological studies in Tak province. Differentially processed GPS data with a spatial resolution of approximately 1 metre were incorporated into a GIS for analysis and mapping. Databases associated with a village GIS included village name, house number, demographic data on house occupants, Aedes aegypti populations, Ae. aegypti immature breeding sites and seroepidemiology data on house occupants.
A Geographical Information System (GIS) was used to study the spatial distribution of dengue haemorrhagic fever (DHF) in Thailand. The National Oceanic and Atmospheric Administration (NOAA) satellite data, with a spatial resolution of 1 km, were used to produce a land cover map and calculate the percentage of forest cover in each province of Thailand. GIS was used as an analysis tool to map the distribution of DHF by creating overlays of epidemiological and digitized province data on a NOAA normalized difference vegetation index image of Thailand. The countrywide GIS database demonstrated that DHF incidence was not correlated to the area of forest cover in the provinces of Thailand. Global Positioning System (GPS) instruments were used to map villages involved in dengue epidemiological studies in Tak province. Differentially processed GPS data with a spatial resolution of approximately 1 metre were incorporated into a GIS for analysis and mapping. Databases associated with a village GIS included village name, house number, demographic data on house occupants, Aedes aegypti populations, Ae. aegypti immature breeding sites and seroepidemiology data on house occupants.