/*
* Copyright (C) 2011-2012 Dr. John Lindsay <jlindsay@uoguelph.ca>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package plugins;
import java.util.Date;
import whitebox.geospatialfiles.WhiteboxRaster;
import whitebox.interfaces.WhiteboxPlugin;
import whitebox.interfaces.WhiteboxPluginHost;
/**
* This tool can be used to express the elevation of a grid cell in a digital elevation model (DEM) as a percentage of the relief between the watershed minimum and maximum values.
*
* @author Dr. John Lindsay email: jlindsay@uoguelph.ca
*/
public class ElevRelativeToWatershedMinMax implements WhiteboxPlugin {
private WhiteboxPluginHost myHost = null;
private String[] args;
/**
* Used to retrieve the plugin tool's name. This is a short, unique name
* containing no spaces.
*
* @return String containing plugin name.
*/
@Override
public String getName() {
return "ElevRelativeToWatershedMinMax";
}
/**
* Used to retrieve the plugin tool's descriptive name. This can be a longer
* name (containing spaces) and is used in the interface to list the tool.
*
* @return String containing the plugin descriptive name.
*/
@Override
public String getDescriptiveName() {
return "Elevation Relative to Watershed Min and Max";
}
/**
* Used to retrieve a short description of what the plugin tool does.
*
* @return String containing the plugin's description.
*/
@Override
public String getToolDescription() {
return "Calculates the elevation of a location relative to the minimum "
+ "and maximum elevations in a watershed.";
}
/**
* Used to identify which toolboxes this plugin tool should be listed in.
*
* @return Array of Strings.
*/
@Override
public String[] getToolbox() {
String[] ret = { "RelativeLandscapePosition" };
return ret;
}
/**
* Sets the WhiteboxPluginHost to which the plugin tool is tied. This is the
* class that the plugin will send all feedback messages, progress updates,
* and return objects.
*
* @param host The WhiteboxPluginHost that called the plugin tool.
*/
@Override
public void setPluginHost(WhiteboxPluginHost host) {
myHost = host;
}
/**
* Used to communicate feedback pop-up messages between a plugin tool and
* the main Whitebox user-interface.
*
* @param feedback String containing the text to display.
*/
private void showFeedback(String message) {
if (myHost != null) {
myHost.showFeedback(message);
} else {
System.out.println(message);
}
}
/**
* Used to communicate a return object from a plugin tool to the main
* Whitebox user-interface.
*
* @return Object, such as an output WhiteboxRaster.
*/
private void returnData(Object ret) {
if (myHost != null) {
myHost.returnData(ret);
}
}
private int previousProgress = 0;
private String previousProgressLabel = "";
/**
* Used to communicate a progress update between a plugin tool and the main
* Whitebox user interface.
*
* @param progressLabel A String to use for the progress label.
* @param progress Float containing the progress value (between 0 and 100).
*/
private void updateProgress(String progressLabel, int progress) {
if (myHost != null && ((progress != previousProgress) ||
(!progressLabel.equals(previousProgressLabel)))) {
myHost.updateProgress(progressLabel, progress);
}
previousProgress = progress;
previousProgressLabel = progressLabel;
}
/**
* Used to communicate a progress update between a plugin tool and the main
* Whitebox user interface.
*
* @param progress Float containing the progress value (between 0 and 100).
*/
private void updateProgress(int progress) {
if (myHost != null && progress != previousProgress) {
myHost.updateProgress(progress);
}
previousProgress = progress;
}
/**
* Sets the arguments (parameters) used by the plugin.
*
* @param args An array of string arguments.
*/
@Override
public void setArgs(String[] args) {
this.args = args.clone();
}
private boolean cancelOp = false;
/**
* Used to communicate a cancel operation from the Whitebox GUI.
*
* @param cancel Set to true if the plugin should be canceled.
*/
@Override
public void setCancelOp(boolean cancel) {
cancelOp = cancel;
}
private void cancelOperation() {
showFeedback("Operation cancelled.");
updateProgress("Progress: ", 0);
}
private boolean amIActive = false;
/**
* Used by the Whitebox GUI to tell if this plugin is still running.
*
* @return a boolean describing whether or not the plugin is actively being
* used.
*/
@Override
public boolean isActive() {
return amIActive;
}
/**
* Used to execute this plugin tool.
*/
@Override
public void run() {
amIActive = true;
String DEMHeader = null;
String watershedHeader = null;
String outputHeader = null;
int progress = 0;
double z = 0;
int row, col;
int rows = 0;
int cols = 0;
int i;
if (args.length <= 0) {
showFeedback("Plugin parameters have not been set.");
return;
}
for (i = 0; i < args.length; i++) {
if (i == 0) {
DEMHeader = args[i];
} else if (i == 1) {
watershedHeader = args[i];
} else if (i ==2) {
outputHeader = args[i];
}
}
// check to see that the inputHeader and outputHeader are not null.
if ((DEMHeader == null) || (watershedHeader == null) || (outputHeader == null)) {
showFeedback("One or more of the input parameters have not been set properly.");
return;
}
try {
WhiteboxRaster DEM = new WhiteboxRaster(DEMHeader, "r");
rows = DEM.getNumberRows();
cols = DEM.getNumberColumns();
double DEM_noData = DEM.getNoDataValue();
WhiteboxRaster watersheds = new WhiteboxRaster(watershedHeader, "r");
if (watersheds.getNumberRows() != rows || watersheds.getNumberColumns() != cols) {
showFeedback("The input images must be the same dimension, i.e. number of "
+ "rows and columns.");
return;
}
double watersheds_noData = watersheds.getNoDataValue();
WhiteboxRaster output = new WhiteboxRaster(outputHeader, "rw", DEMHeader,
WhiteboxRaster.DataType.FLOAT, DEM_noData, 0);
output.setPreferredPalette("spectrum.pal");
// how many watersheds are there?
int minWatershedVal = 9999999;
int maxWatershedVal = -9999999;
double[] watershedData;
updateProgress("Loop 1 of 3", 0);
for (row = 0; row < rows; row++) {
watershedData = watersheds.getRowValues(row);
for (col = 0; col < cols; col++) {
if (watershedData[col] != watersheds_noData &&
watershedData[col] > 0) {
if (watershedData[col] < minWatershedVal) {
minWatershedVal = (int)watershedData[col];
}
if (watershedData[col] > maxWatershedVal) {
maxWatershedVal = (int)watershedData[col];
}
}
}
if (cancelOp) {
cancelOperation();
return;
}
progress = (int) (100f * row / (rows - 1));
updateProgress("Loop 1 of 3", progress);
}
// find the minimum and maximum elevation in each watershed.
int numWatersheds = maxWatershedVal - minWatershedVal + 1;
double[][] elevations = new double[3][numWatersheds];
for (i = 0; i < numWatersheds; i++) {
elevations[0][i] = 9999999; // min elevation
elevations[1][i] = -9999999; // max elevation
}
double[] data;
int watershedVal;
updateProgress("Loop 2 of 3", 0);
for (row = 0; row < rows; row++) {
watershedData = watersheds.getRowValues(row);
data = DEM.getRowValues(row);
for (col = 0; col < cols; col++) {
if (watershedData[col] != watersheds_noData &&
watershedData[col] > 0) {
watershedVal = (int)watershedData[col];
z = data[col];
if (z != DEM_noData) {
if (z < elevations[0][watershedVal - minWatershedVal]) {
elevations[0][watershedVal - minWatershedVal] = z;
}
if (z > elevations[1][watershedVal - minWatershedVal]) {
elevations[1][watershedVal - minWatershedVal] = z;
}
}
}
}
if (cancelOp) {
cancelOperation();
return;
}
progress = (int) (100f * row / (rows - 1));
updateProgress("Loop 2 of 3", progress);
}
// caculate the relief in each watershed.
for (i = 0; i < numWatersheds; i++) {
elevations[2][i] = elevations[1][i] - elevations[0][i];
}
// last step...place each cell's elevation relative to the min max values.
updateProgress("Loop 3 of 3", 0);
for (row = 0; row < rows; row++) {
watershedData = watersheds.getRowValues(row);
data = DEM.getRowValues(row);
for (col = 0; col < cols; col++) {
if (watershedData[col] != watersheds_noData &&
watershedData[col] > 0) {
watershedVal = (int)watershedData[col];
z = data[col];
if (z != DEM_noData) {
i = watershedVal - minWatershedVal;
output.setValue(row, col, (z - elevations[0][i])
/ elevations[2][i] * 100);
} else {
output.setValue(row, col, DEM_noData);
}
} else {
output.setValue(row, col, DEM_noData);
}
}
if (cancelOp) {
cancelOperation();
return;
}
progress = (int) (100f * row / (rows - 1));
updateProgress("Loop 3 of 3", progress);
}
output.addMetadataEntry("Created by the "
+ getDescriptiveName() + " tool.");
output.addMetadataEntry("Created on " + new Date());
DEM.close();
watersheds.close();
output.close();
// returning a header file string displays the image.
returnData(outputHeader);
} catch (OutOfMemoryError oe) {
myHost.showFeedback("An out-of-memory error has occurred during operation.");
} catch (Exception e) {
myHost.showFeedback("An error has occurred during operation. See log file for details.");
myHost.logException("Error in " + getDescriptiveName(), e);
} finally {
updateProgress("Progress: ", 0);
// tells the main application that this process is completed.
amIActive = false;
myHost.pluginComplete();
}
}
}