Marthews, T.R.; Dadson, S.J.; Lehner, B.; Abele, S.; Gedney, N.

High-resolution global topographic index values

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

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Supporting documentation

Format of the dataset : netCDF

Access and use conditions

This resource is made available under the terms of the Open Government Licence

You must cite: Marthews, T.R.; Dadson, S.J.; Lehner, B.; Abele, S.; Gedney, N. (2015). High-resolution global topographic index values. NERC Environmental Information Data Centre. https://doi.org/10.5285/6b0c4358-2bf3-4924-aa8f-793d468b92be

 

This product, High-resolution global topographic index values, has been created with use of data from the HydroSHEDS database which is © World Wildlife Fund, Inc. (2006-2013) and has been used herein under license. WWF has not evaluated the data as altered and incorporated within, High-resolution global topographic index values, and therefore gives no warranty regarding its accuracy, completeness, currency or suitability for any particular purpose. Portions of the HydroSHEDS database incorporate data which are the intellectual property rights of © USGS (2006-2008), NASA (2000-2005), ESRI (1992-1998), CIAT (2004-2006), UNEP-WCMC (1993), WWF (2004), Commonwealth of Australia (2007), and Her Royal Majesty and the British Crown and are used under license. The HydroSHEDS database and more information are available at http://www.hydrosheds.org

Where/When

Study area
Temporal extent
2014-01-01    to    …

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.

Correspondence/contact details

Marthews, T.R.
Centre for Ecology & Hydrology
enquiries@ceh.ac.uk

Authors

Marthews, T.R.
University of Oxford
Dadson, S.J.
University of Oxford
Lehner, B.
McGill University
Abele, S.
University of Oxford
Gedney, N.
Hadley Centre for Climate Prediction and Research

Other contacts

Custodian
Environmental Information Data Centre
eidc@ceh.ac.uk
Publisher
NERC Environmental Information Data Centre
eidc@ceh.ac.uk

Spatial

Spatial reference system
WGS 84

Tags

Topic categories
Environment
INSPIRE Theme
Hydrography
Keywords
hydrological regimes,  hydrology,  inundation,  Soil soil moisture,  spatial data,  Topography