The use of unsupervised classification of Landsat-5 TM images in analysing the types of vegetation in the areas of "breaking dikes or opening sluice for water store" / 中华流行病学杂志
Chinese Journal of Epidemiology
;
(12): 88-91, 2005.
Artigo
em Chinês
| WPRIM
| ID: wpr-232130
ABSTRACT
<p><b>OBJECTIVE</b>To clarify the change of vegetation types and its relationship between the density of alive-snails in the areas of "breaking dikes or opening sluice for water store" in Jicheng.</p><p><b>METHODS</b>Synthesized false color images of Jicheng before and after 1998 (1994 and 2003) were classified without supervision and results were compared. Vegetation types were identified on the spot.</p><p><b>RESULTS</b>Normalized difference vegetation index (NDVI) of snail habitats before 1998 were between 126 and 183 in Jicheng, whose vegetation types were mainly paddy, cotton and cabbage. NDVI of snail habitats in Jicheng after 1998 were between 152 and 193 whose vegetation types were mainly poplar forest, bulrush and grass. Areas of snail habitats increased from 64.64% to 66.47%. Snail habitats were mostly composed of mixed vegetation types and mono-typed vegetation was hardly found. According to the density of alive-snails orders from high to low were poplar forest and bulrush, poplar forest and grass, bulrush.</p><p><b>CONCLUSION</b>Vegetation types would not be identified by unsupervised classification only. Poplar forest, bulrush and grass were closedly related to the density of alive-snails.</p>
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Parasitologia
/
Fisiologia
/
Plantas
/
Schistosoma japonicum
/
Caramujos
/
Esquistossomose Japônica
/
Cruzamento
/
China
/
Monitoramento Ambiental
/
Epidemiologia
Tipo de estudo:
Estudo de rastreamento
Limite:
Animais
País/Região como assunto:
Ásia
Idioma:
Chinês
Revista:
Chinese Journal of Epidemiology
Ano de publicação:
2005
Tipo de documento:
Artigo
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