Table 1. Input and type of covariates used in the spatial statistical models, units of measurements and data source.
| Input covariates | Unit | Type of covariate | Source (all data used are publicly available) |
|---|---|---|---|
| Environmental factors influencing host exposure to mosquito vectors | |||
| Environmental conditions of the month current to case | |||
| EVIt | EVI index (0–1) | Time-varying | Terra MOD13C2.005 product (2007–2010) (http://modis.gsfc.nasa.gov/) |
| LSTt | Degree Celsius | Terra V5 MOD11C3.005 (2007–2010) (http://modis.gsfc.nasa.gov/) | |
| Environmental conditions of the month prior to case | |||
| EVIt-1 | EVI index (0–1) | Time-varying | Terra MOD13C2.005 product (2007–2010) (http://modis.gsfc.nasa.gov/) |
| LSTt-1 | Degree Celsius | Terra V5 MOD11C3.005 (2007–2010) (http://modis.gsfc.nasa.gov/) | |
| EVId | n/a | Terra MOD13C2.005 product (2000–2007) (http://modis.gsfc.nasa.gov/) | |
| Topographic factors influencing host exposure to mosquito vectors | |||
| Distance to rivers and waterbodies | Decimal degrees | Fixed-time | Rivers in Africa (Derived from Hydrosheds) (2010) http://www.fao.org/geonetwork/srv/en/main.home Harmonized DCW-VMap0 Surface Water Bodies (2006) http://www.fao.org/geonetwork/srv/en/main.home |
| Land use | Agro-pastoralism, Forestry, Herbaceous/bare areas, Irrigated areas, Urban areas, Water/Wetlands | Land Use Systems of the World – Sub Saharan Africa, Beta Version (2008) http://www.fao.org/geonetwork/srv/en/main.home |
EVIt = Enhance Vegetation Index of the month current to case; EVIt-1 = Enhance Vegetation Index of the month prior to case; EVId = Enhanced Vegetation Index disturbance; LSTt = Land Surface Temperature of the month current to case; LSTt-1 = Land Surface Temperature of the month prior to case.