High-resolution global topographic index values
This is the most recent version of this dataset (other versions )
The topographic index is a hydrological quantity describing the propensity of the soil at landscape points to become saturated with water as a result of topographic position (i.e. not accounting for other factors such as climate that also affect soil moisture but are accounted for separately). Modern land surface models require a characterisation of the land surface hydrological regime and this parameter allows the use of the TOPMODEL hydrological model to achieve this .This Geographic Information System layer is intended for use as topographic ancillary files for the TOPMODEL routing model option within the Joint UK Land Environment Simulator (JULES) land surface model. The topographic index variable here is directly comparable to the compound topographic index available from United States Geological Survey's Hydro1K at 30 sec resolution. PLEASE NOTE: This dataset is a correction to a previous version which was found to contain errors (doi:10/t7d). In the previous version all pixels north of 4.57 degrees south were shifted consistently 9.3 km to the west. This version is correctly aligned at all points.
Publication date: 2015-03-03
- Study area
- Temporal extent
2014-01-01 to&p; …
Provenance & quality
The GA2 algorithm has been used to calculate these topographic index values, using base data layers provided by the HydroSHEDS suite of GIS layers. All files were generated using FORTRAN 90 at 15 arc-sec resolution (cells circa 450 m x 450 m at the Equator). PLEASE NOTE: This dataset is a correction to a previous version which was found to contain errors (doi:10/t7d). In the previous version all pixels north of 4.57 degrees south were shifted consistently 9.3 km to the west. This version is correctly aligned at all points.
This dataset is a supplement to:
Marthews, T.R., Dadson, S.J., Lehner, B., Abele, S., & Gedney, N. (2015). High-resolution global topographic index values for use in large-scale hydrological modelling. Hydrology and Earth System Sciences, 19(1), 91–104.
Dr. Toby Marthews
UK Centre for Ecology & Hydrology
Maclean Building, Benson Lane, Crowmarsh Giffordenquiries@ceh.ac.uk