#include <grid.h>
Collaboration diagram for TGrid:
Public Member Functions | |
| TGrid (void) | |
| ~TGrid () | |
| void | clearArrays () |
| Clear all internal arrays. | |
| void | createMountain (int Iterations, int Sigma, float Hurst, bool Addition) |
| Create a fractal landscape. | |
| void | createWadi (float Grad, bool Parabel) |
| Create a wadi landscape with a smooth surface. | |
| void | calculateElevation (void) |
| Drape fractal landscape over wadi and smoothe the topography. | |
| void | countHigherCellsGIS (void) |
| Calculation of flow accumulation of each cell. | |
| void | outputContributing (void) |
| The flow accumulation of each cell is written to a file "Contributing.txt". | |
| void | outputElevation (void) |
| The elevation of each cell is written to a file "Elevation.txt". | |
| void | outputTestVariable (void) |
| Store a variable in a text file. | |
| void | writeFile (float slope, int r) |
| Write the elevation and other information to a text file. | |
Private Member Functions | |
| float | f3 (float delta, float x0, float x1, float x2) |
| float | f4 (float delta, float x0, float x1, float x2, float x3) |
Private Attributes | |
| celldata | CellCount [N+1][N+1] |
| float | CellArray [N+1][N+1] |
| float | CellArrayF [N+1][N+1] |
| float | CellArrayL [N+1][N+1] |
| flowinfo | dir [N+1][N+1] |
TGrid must be created once.
Definition at line 102 of file grid.h.
| TGrid::TGrid | ( | void | ) |
Definition at line 52 of file grid.cpp.
References clearArrays(), r250_init(), and seed.
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| void TGrid::clearArrays | ( | ) |
Clear all internal arrays.
This is necessary when the algorithm is used repeatedly in a loop
Definition at line 68 of file grid.cpp.
References CellArray, CellArrayF, CellArrayL, CellCount, N, celldata::NCellsAll, and celldata::Position.
Referenced by TGrid().
| void TGrid::createMountain | ( | int | Iterations, | |
| int | Sigma, | |||
| float | Hurst, | |||
| bool | Addition | |||
| ) |
Create a fractal landscape.
Algorithm of Saupe (1988)
Iterations: The number of iterations used for producing the landscape.
The surface becomes smoother with more iterations.The edge of the grid must have length 2n+1 with n ≤ Iterations.
Sigma: Sigma increases the surface variability (roughness). A standard value is 25.
Hurst: The Hurst factor increases the heterogeneity (patchiness) of the landscape. A standard value is 0.45.
Addition: If TRUE, the fractal landscape is draped over a wadi valley.
Saupe, D. 1988. Algorithms for random fractals. Pages 71-136 in Peitgen, H., and D. Saupe, editors. Algorithms for random fractals. Springer-Verlag, New York, New York, U.S.A.
Definition at line 91 of file grid.cpp.
References CellArrayF, f3(), f4(), N, and RandG().
Referenced by main().
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| void TGrid::createWadi | ( | float | Grad, | |
| bool | Parabel | |||
| ) |
Create a wadi landscape with a smooth surface.
Grad is the inclination (in degrees) of the slopes. When Parabel==TRUE the wadiscape's cross-section has the form of a parabola else it has an inverted symmetric trapezoidal cross-section / cut into a plateau. The bottom of the wadi is always 51 cells (255 m) wide, the length of the slopes and plateau depends on the angle (i.e. Grad). The elevation of the plateau is always 100 m.
Definition at line 156 of file grid.cpp.
References CellArrayL, CellCount, N, and celldata::Position.
Referenced by main().
| void TGrid::calculateElevation | ( | void | ) |
Drape fractal landscape over wadi and smoothe the topography.
The elevation of the fractal landscape is centred and added to the wadi elevation. The result is smoothed by a moving average window of length 2 in 2 dimensions
Definition at line 233 of file grid.cpp.
References CellArray, CellArrayF, CellArrayL, and N.
Referenced by main().
| void TGrid::countHigherCellsGIS | ( | void | ) |
Calculation of flow accumulation of each cell.
This function determines how many cells contribute water to lower cells (flow accumulation). For a particular cell, the function checks which slope to its 8 neighbour cells is the steepest. The water will flow to this cell. (The algorithm used in GIS applications, see http://gis.esri.com/library/userconf/proc97/proc97/to200/pap198/p198.htm ). The receiving cell stores a pointer to the donating cell. In the final step, each cell checks back to its donating cell for the accumulated number of contributing cells.
check whether surrounding cells are lower
route flow to the cell with the smallest ("most negative"!) angle
check the contributing cells for each cell
Definition at line 299 of file grid.cpp.
References CellArray, CellCount, dir, flowinfo::getTotalContributing(), N, and celldata::NCellsAll.
Referenced by main().
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| void TGrid::outputContributing | ( | void | ) |
| void TGrid::outputElevation | ( | void | ) |
| void TGrid::outputTestVariable | ( | void | ) |
Store a variable in a text file.
You need to specify in the code which variable is written to the file. This function is needed only for debugging puposes or if th user needs additional information. Currently the output is CellArrayF (elevation of the fractal landscape)
Definition at line 399 of file grid.cpp.
References CellArrayF, and N.
Referenced by main().
| void TGrid::writeFile | ( | float | slope, | |
| int | r | |||
| ) |
Write the elevation and other information to a text file.
The function writes into a text file "Wadiscape_SLOPE_ID" where SLOPE is the inclination of the valley slopes and ID is a consecutive number. The file contains the vtab separated values of row number, column number, elevation (m), habitat code (P: plateau, N: North-facing slope, S: South-facing slope, W: wadi bottom), flow accumulation of each cell in a 300 x 300 cell centred subgrid.
Definition at line 452 of file grid.cpp.
References CellArray, CellCount, itoa(), N, celldata::NCellsAll, and celldata::Position.
Referenced by main().
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| float TGrid::f3 | ( | float | delta, | |
| float | x0, | |||
| float | x1, | |||
| float | x2 | |||
| ) | [inline, private] |
Definition at line 81 of file grid.cpp.
References RandG().
Referenced by createMountain().
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| float TGrid::f4 | ( | float | delta, | |
| float | x0, | |||
| float | x1, | |||
| float | x2, | |||
| float | x3 | |||
| ) | [inline, private] |
Definition at line 86 of file grid.cpp.
References RandG().
Referenced by createMountain().
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celldata TGrid::CellCount[N+1][N+1] [private] |
Definition at line 171 of file grid.h.
Referenced by clearArrays(), countHigherCellsGIS(), createWadi(), outputContributing(), and writeFile().
float TGrid::CellArray[N+1][N+1] [private] |
Definition at line 172 of file grid.h.
Referenced by calculateElevation(), clearArrays(), countHigherCellsGIS(), outputElevation(), and writeFile().
float TGrid::CellArrayF[N+1][N+1] [private] |
Definition at line 173 of file grid.h.
Referenced by calculateElevation(), clearArrays(), createMountain(), and outputTestVariable().
float TGrid::CellArrayL[N+1][N+1] [private] |
Definition at line 174 of file grid.h.
Referenced by calculateElevation(), clearArrays(), and createWadi().
flowinfo TGrid::dir[N+1][N+1] [private] |
1.5.1