Model:Area-Slope Equation Calculator: Difference between revisions

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|Categories=Hydrology, Terrestrial
|Categories=Hydrology, Terrestrial
|Spatial dimensions=2D
|Spatial dimensions=2D
|Spatialscale=Landscape-Scale, Watershed-Scale
|One-line model description=Pixel scale Area-Slope equation calculator
|One-line model description=Pixel scale Area-Slope equation calculator
|Extended model description=Traditionally the Area-Slope equation (S=cA^alpha) is extracted from a catchment area vs. slope plot. This model calculate the Area-Slope constant and coefficient (alpha) for each pixel at the catchment as a function of its downslope neighbor.
|Extended model description=Traditionally the Area-Slope equation (S=cA^alpha) is extracted from a catchment area vs. slope plot. This model calculate the Area-Slope constant and coefficient (alpha) for each pixel at the catchment as a function of its downslope neighbor.
}}
}}
{{Model technical information
{{Model technical information
|Supported platforms=Windows
|Supported platforms=Unix, Linux, Mac OS, Windows
|Programming language=Matlab
|Programming language=Matlab
|Code optimized=Single Processor
|Start year development=2006
|Start year development=2006
|Does model development still take place?=No
|Does model development still take place?=No
|Model availability=As executable
|End year development=2009
|Source code availability=Through owner
|Model availability=As code
|Source code availability=Through CSDMS repository
|Program license type=Other
|Program license type=Other
|Program license type other=--
|Program license type other=--
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# Constant.
# Constant.
|Output format=ASCII
|Output format=ASCII
|Pre-processing software needed?=No
|Pre-processing software needed?=Yes
|Describe pre-processing software=ArcGIS for calculating Area, Slope and D8 Flow direction
|Post-processing software needed?=Yes
|Post-processing software needed?=Yes
|Describe post-processing software=ArcGIS or other to convert ASCII output to map.
|Describe post-processing software=ArcGIS or other to convert ASCII output to map.
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{{Model testing
{{Model testing
|Describe available calibration data sets=Cohen, S., G. Willgoose, and G. Hancock (2008), A methodology for calculating the spatial distribution of the area-slope equation and the hypsometric integral within a catchment, J. Geophys. Res., 113, F03027, doi:10.1029/2007JF000820.
|Describe available calibration data sets=Cohen, S., G. Willgoose, and G. Hancock (2008), A methodology for calculating the spatial distribution of the area-slope equation and the hypsometric integral within a catchment, J. Geophys. Res., 113, F03027, doi:10.1029/2007JF000820.
|Describe available test data sets=Demo data included. 107x127 pixels catchment.
|Model test data=Area demo.txt, Slope demo.txt, Flowdir demo.txt,
|Describe ideal data for testing=Reasonable relief catchment.
|Describe ideal data for testing=Reasonable relief catchment.
}}
}}

Revision as of 11:02, 6 August 2010

Contact

Name Sagy Cohen
Type of contact Model developer
Institute / Organization The University of Newcastle
Postal address 1
Postal address 2
Town / City Callaghan
Postal code 2308
State NO STATE
Country Australia
Email address sagy.cohen@uon.edu.au
Phone
Fax


Name Garry Willgoose
Type of contact Model developer
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country
Email address
Phone
Fax


Name Greg Hancock
Type of contact Model developer
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country
Email address
Phone
Fax



Area-Slope Equation Calculator


Metadata

Summary

Also known as
Model type Modular
Model part of larger framework
Note on status model
Date note status model

Technical specs

Supported platforms
Unix, Linux, Mac OS, Windows
Other platform
Programming language

Matlab

Other program language
Code optimized Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development 2006
Does model development still take place? No
If above answer is no, provide end year model development 2009
Code development status
When did you indicate the 'code development status'?
Model availability As code
Source code availability
(Or provide future intension) 		Through CSDMS repository
Source web address
Source csdms web address
Program license type Other
Program license type other --
Memory requirements --
Typical run time Minutes


In/Output

Describe input parameters Three input maps at ESRI ASCII format:
  1. Flow Direction (ArcGIS format);
  2. Contributing Area (Flow Accumulation-ArcGIS format);
  3. Slope (ArcGIS format);
Input format ASCII
Other input format
Describe output parameters Two output maps ESRI ASCII format:
  1. Alpha (coefficient);
  2. Constant.
Output format ASCII
Other output format
Pre-processing software needed? Yes
Describe pre-processing software ArcGIS for calculating Area, Slope and D8 Flow direction
Post-processing software needed? Yes
Describe post-processing software ArcGIS or other to convert ASCII output to map.
Visualization software needed? Yes
If above answer is yes ESRI, Matlab
Other visualization software


Process

Describe processes represented by the model Extract c and alpha from:

Slope=cArea^alpha For more details: Cohen, S., G. Willgoose, and G. Hancock (2008), A methodology for calculating the spatial distribution of the area-slope equation and the hypsometric integral within a catchment, J. Geophys. Res., 113, F03027, doi:10.1029/2007JF000820.

Describe key physical parameters and equations --
Describe length scale and resolution constraints Computer memory.
Describe time scale and resolution constraints --
Describe any numerical limitations and issues Artificially limit the alpha values between 2 and -2 and the constant values between 0 and 2.

Done so to avoid extreme outliers.


Testing

Describe available calibration data sets Cohen, S., G. Willgoose, and G. Hancock (2008), A methodology for calculating the spatial distribution of the area-slope equation and the hypsometric integral within a catchment, J. Geophys. Res., 113, F03027, doi:10.1029/2007JF000820.
Upload calibration data sets if available:
Describe available test data sets
Upload test data sets if available: Media:Area demo.txt, Media:Slope demo.txt, Media:Flowdir demo.txt
Describe ideal data for testing Reasonable relief catchment.


Other

Do you have current or future plans for collaborating with other researchers? --
Is there a manual available? No
Upload manual if available:
Model website if any
Model forum / discussion board
Comments


Introduction

History

Papers

Issues

Help

Input Files

Output Files

Download

Source

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