Summary
| Also known as
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| Model type
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Modular
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| Model part of larger framework
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| Note on status model
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| Date note status model
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Technical specs
| Supported platforms
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Windows
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| Other platform
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| Programming language
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Matlab
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| Other program language
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| Code optimized
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| Multiple processors implemented
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| Nr of distributed processors
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| Nr of shared processors
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| Start year development
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2006
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| Does model development still take place?
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No
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| If above answer is no, provide end year model development
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| Code development status
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| When did you indicate the 'code development status'?
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| Model availability
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As executable"As executable" is not in the list (As code, As teaching tool) of allowed values for the "Model availability" property.
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Source code availability
(Or provide future intension)
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| Source web address
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| Source csdms web address
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| Program license type
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Other
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| Program license type other
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--
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| Memory requirements
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--
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| Typical run time
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Minutes
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In/Output
| Describe input parameters
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Three input maps at ESRI ASCII format:
- Flow Direction (ArcGIS format);
- Contributing Area (Flow Accumulation-ArcGIS format);
- Slope (ArcGIS format);
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| Input format
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ASCII
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| Other input format
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| Describe output parameters
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Two output maps ESRI ASCII format:
- Alpha (coefficient);
- Constant.
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| Output format
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ASCII
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| Other output format
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| Pre-processing software needed?
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No
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| Describe pre-processing software
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| Post-processing software needed?
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Yes
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| Describe post-processing software
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ArcGIS or other to convert ASCII output to map.
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| Visualization software needed?
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Yes
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| If above answer is yes
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ESRI, Matlab
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| Other visualization software
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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.
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| Describe key physical parameters and equations
|
--
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| Describe length scale and resolution constraints
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Computer memory.
|
| Describe time scale and resolution constraints
|
--
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| 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.
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| Upload calibration data sets if available:
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| Describe available test data sets
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Demo data included. 107x127 pixels catchment.
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| Upload test data sets if available:
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| Describe ideal data for testing
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Reasonable relief catchment.
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Other
| Do you have current or future plans for collaborating with other researchers?
|
--
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| Is there a manual available?
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No
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| Upload manual if available:
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| Model website if any
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| Model forum / discussion board
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Area-Slope Equation Calculator
Introduction
History
Papers
Area-Slope Equation Calculator Questionnaire
Contact Information
| Model:
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Area-Slope Equation Calculator
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| Contact person:
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Sagy Cohen (Model developer)
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| Institute:
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The University of Newcastle
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| City:
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Callaghan
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| Country:
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Australia
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| Email:
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sagy.cohen@newcastle.edu.au
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| 2nd person involved:
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Garry Willgoose (Model developer)
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| 3rd person involved:
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Greg Hancock (Model developer)
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Model Description
| Model type:
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Modular model for the Hydrological domain.
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| Description:
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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.
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Technical information
| Supported platforms:
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Windows
|
| Programming language:
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Matlab
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| Model development started at:
|
2006 and ended in 2009.
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| To what degree will the model become available:
|
An executable will be available
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| Current license type:
|
--
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| Memory requirements:
|
--
|
| Typical run time:
|
Minutes
|
Input / Output description
| Input parameters:
|
Three input maps at ESRI ASCII format:
- Flow Direction (ArcGIS format);
- Contributing Area (Flow Accumulation-ArcGIS format);
- Slope (ArcGIS format);
|
| Input format:
|
ASCII
|
| Output parameters:
|
Two output maps ESRI ASCII format:
- Alpha (coefficient);
- Constant.
|
| Output format:
|
ASCII
|
| Post-processing software (if needed):
|
Yes, ArcGIS or other to convert ASCII output to map.
|
| Visualization software (if needed):
|
Yes, ESRI, Matlab.
|
Process description
| Processes represented by 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.
|
| Key physical parameters & equations:
|
--
|
| Length scale & resolution constraints:
|
Computer memory
|
| Time scale & resolution constraints:
|
--
|
| 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
| 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.
|
| Available test data sets:
|
Demo data included. 107x127 pixels catchment.
|
| Ideal data for testing:
|
Reasonable relief catchment.
|
User groups
| Currently or plans for collaborating with:
|
--
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Documentation
| Key papers of the model:
|
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.
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| Is there a manual available:
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No
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| Model website if any:
|
--
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Issues
Help
Input Files
Output Files
Download
Source |
