Seasonal and Geographical Variation of Dengue Vectors in Narathiwat, South Thailand

Figure 1

GIS-based land use map illustrated with two related urban and rural settings of Narathiwat. The relative population density ratio (PDR) for each district is shown to discriminate the urban-rural gradient. This approach was consistent with the degree of urbanization [9]. All 300 georeferenced houses that were used to conduct Aedes larval surveys were derived from 5 clusters of Muang Narathiwat (30 houses each), 2 clusters of Ra-ngae (40 and 35 houses), and 2 clusters of Cho-airong (40 and 35 houses). Representative cluster for each district that was assigned to a grid of 500 m² is shown. Miscellaneous land included roads, landfills, pits (soil, sand, and laterite), scrubs, bamboos, marsh, swamp, grass, and others. All the land use maps that were also validated by the ground surveys between 2012 and 2013 were constructed using the ArcGIS ver 10.1 software applications.