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Table 1 Characteristics of environmental variables considered important in predicting the distribution of STH in Zimbabwe

From: Inclusion of edaphic predictors for enhancement of models to determine distribution of soil-transmitted helminths: the case of Zimbabwe

Variable Units Spatial resolution (km) Data source Accessible at
Gridded monthly CHIRPS precipitation mm per month ~5.5 Climate Hazards Group http://chg.geog.ucsb.edu/data/chirps/
MODIS monthly daytime land surface temperature (MOD11C3) Kelvin ~5.5 NASA’s Land Processes Distributed Active Archive Center (LP DAAC) https://lpdaac.usgs.gov/
MODIS monthly night-time land surface temperature (MOD11C3) Kelvin ~5.5 NASA’s Land Processes Distributed Active Archive Center (LP DAAC) https://lpdaac.usgs.gov/
MODIS normalized difference vegetation index (MOD13A3) dimensionless (-1 to 1) 1 NASA’s Land Processes Distributed Active Archive Center (LP DAAC) https://lpdaac.usgs.gov/
Gridded human population density number of persons/km2 1 Socioeconomic and Data Application Centers http://sedac.ciesin.columbia.edu/data/
Distance from perennial rivers m 1 Calculated in a GIS  
Long-term average soil moisture % 30 Africa Soil Information Services africasoils.net
Soil pH 5 International Soil Reference Centre (ISRIC) http://www.isric.org
Soil organic carbon (C) content topsoil (0–30 cm) % C 5 International Soil Reference Centre (ISRIC) http://www.isric.org