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[Analysis on the relationship between malaria epidemics and NOAA-AVHRR NDVI in Hainan province]
Liang Wen1, De-zhong Xu, Shan-qing Wang
1Department of Epidemiology, Faculty of Preventive Medicine, Fourth Military Medical University, Xi'an 710032, China.
Objective:
To explore the relationship between malaria epidemics and NOAA-AVHRR NDVI.
Methods:
Data on malaria were collected in all 19 counties in Hainan province from Feb, 1995 to Jan, 1996. Values regarding normalized difference vegetation index (NDVI)-related indicators including mean and maximum values of NDVI, the area proportion of NDVI values of 145- and 145+, months with NDVI values of 135+, 140+, 145+, 150+ of these counties in this period were all extracted from NOAA-AVHRR images, using ERDAS8.5 software. The coefficients of correlation of malaria incidences and these NDVI-related indicator values were then calculated with SPSS 11.0.
Results:
The incidence of malaria showed positive correlations to mean and maximum values of NDVI, the area proportion of NDVI values of 145+ and months with NDVI values of 135+, 140+, 145+, 150+ respectively, but having negative correlation to the area of NDVI values of 145-. The malaria epidemic regions were in accordance with those regions that the NDVI values of 145+ were continuing for 9 months or more.
Conclusion:
Malaria prevalence was associated with NOAA-AVHRR NDVI value which could be considered to be use for malaria surveillance in Hainan province.
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