464
Table 17.1 Non-exhaustive examples of key, global, open access auxiliary variables; some sources; their maximum spatial and temporal resolution; and the
available data format
Variable
Sources
Maximum resolution
Data format
Temporal
Spatial
Soils
Physical/chemical
SoilGrids (Hengl et al. 2017)
Static
250 m
Raster
Geology
Lithology/mineralogy
GLIM (Hartmann and Moosdorf 2012)
Static
<10 km
Raster
General
OneGeology
Static
Varied
Raster/vector
Topography
Land topography, ocean
bathymetry
ETOPO1
Static
1 arc min
Raster
SRTM
Static
1 arc sec
Raster
Hydrology
Vertical soil, groundwater
reservoir
WaterGAP
(Flörke et al. 2013)
Daily
5 arc min
Raster
Permeability and porosity
GLHYMPS
(Gleeson et al. 2014)
Static
100 km
2
Vector
Global reservoirs/dams
GRanD
(Lehner et al. 2011)
Static
Country
Vector
Irrigated areas
Global irrigation maps (Siebert et al. 2013)
Static
5 arc min
Raster
Water used for irrigation
FAOSTAT
Static
Country
Vector
Rivers and lake centerlines
Natural Earth
Static
10 m
Vector
Lakes and reservoirs
Natural Earth
Static
10 m
Vector
Climate
Temperature/ precipitation
CHELSA
(Karger et al. 2017)
Monthly
30 arc s
Raster
CRU TS v. 4.01 (Harris et al. 2014)
Monthly (1901–2016)
0.5°
Raster
Precipitation
TRMM
3-hourly (1998–2016)
0.25°
Raster
CHIRPS
Daily (1981–2016)
0.05°
Raster
Evapotranspiration
MODIS, NASA
Yearly/8- day (2000–2010) 500 m
Raster
F. Schrodt et al.