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Contributing Area - Multiple Flow Direction (Partial) derived from 1" SRTM DEM-H

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About this Collection

Contributing Area - Multiple Flow Direction (Partial) derived from 1" SRTM DEM-H


CA_MFD_PARTIAL is contributing area in m2 computed using multiple flow directions on hillslopes and ANUDEM-derived flow directions in channels. The contributing area was computed on 1 degree tiles with 200 cell (about 5 km) overlaps so the areas in channels do not account for catchments beyond that size (hence the use of PARTIAL in the name). The p... more


Environmental Management Land Capability and Soil Degradation Landscape Ecology Natural Resource Management Soil Sciences not elsewhere classified


https://doi.org/10.4225/08/57511C42603DF


11 Feb 2000


22 Feb 2000


CSIRO Enquiries
CSIROEnquiries@csiro.au
1300 363 400

Contributing Area LAND Topography Models ECOLOGY Landscape TERN_Soils Land Surface Australia


Source data 1. 1 arc-second SRTM-derived Hydrologically Enforced Digital Elevation Model (DEM-H; ANZCW0703014615). 2. DEM-H Flow direction grid 3. 1 arc-second CA_MFD (partial) product 4. 3 arc-second resolution SRTM water body and ocean mask datasets CA_MFD_PARTIAL calculation CA_MFD_PARTIAL was calculated from DEM-H to provide the contributing area for the calculation of TWI, following the methods described in Gallant and Wilson (2000). It is derived from a slope-weighted multiple flow algorithm for flow accumulation, but uses the flow directions derived from the interpolation (ANUDEM) where they exist. In this case, they are the ANUDEM-derived flow directions only on the enforced stream lines, so the flow accumulation will follow the streams. The varying area of grid cells with latitude due to the geographic projection of the data was accounted for in the calculation of contributing area. The CA_MFD_PARTIAL calculation was performed on 1° x 1° tiles, with 200 cell (about 5 km) overlaps at tile edges. This overlap ensures that contributing area for channels with catchments up to 5 km across is correctly captured, but the area of larger catchments will not be included. This product is therefore not suitable for use where the contributing areas for larger catchments are needed. The primary purpose of this product was to support calculation of Topographic Wetness Index (TWI), which is designed to represent patterns on hillslopes and does not need full catchment contributing area in channels. A full contributing area product will be developed in the future. The 3 arc-second resolution version was generated from the 1 arc-second CA_MFD (partial) product. This was done by aggregating the 1” data over a 3 x 3 grid cell window and taking the maximum of the nine values that contributed to each 3” output grid cell. The 3” CA_MFD data were then masked using the SRTM 3” ocean and water body datasets. References Gallant, J.C. and Wilson, J.P. (2000) Primary topographic attributes, chapter 3 in Wilson, J.P. and Gallant, J.C. Terrain Analysis: Principles and Applications, John Wiley and Sons, New York.


Access to this data has been made possible by the Terrestrial Ecosystem Research Network (TERN), supported by the Australian Government through the National Collaborative Research Infrastructure Strategy and the Super Science Initiative.


Creative Commons Attribution 4.0 International Licence


CSIRO (Australia)


Gallant, John; Austin, Jenet (2012): Contributing Area - Multiple Flow Direction (Partial) derived from 1" SRTM DEM-H. v2. CSIRO. Data Collection. https://doi.org/10.4225/08/57511C42603DF


All Rights (including copyright) CSIRO 2012.


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Location Details

10°0′0″ S


44°0′0″ S


154°0′0″ E


113°0′0″ E


WGS84


More about this Collection

John Gallant


Terrain Analysis Research Team Leader


0 m


0 m



Raster




eng


UTF8


Elevation


About this Project

1181.2 TERN Facility No9 InfoGrid GRUNDY


The Soil and Landscape Grid of Australia is a comprehensive fine spatial resolution grid of functional soil attributes and key landscape features across Australia. The landscape attributes are derived from the data collected by the Shuttle Radar Topography Mission, whilst the soil attribute surfaces are modelled from existing soils information. The... more


John Gallant


National Elevation and Terrain Datasets


SRTM-derived elevation and terrain covariate datasets at 1 second or 3 second resolution


Measurement


John Gallant


Jenet Austin


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