/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2014, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*/
package org.geotools.process.spatialstatistics.pattern;
import java.io.IOException;
import java.util.logging.Logger;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.geometry.jts.GeometryCoordinateSequenceTransformer;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.process.spatialstatistics.core.FeatureTypes;
import org.geotools.process.spatialstatistics.storage.IFeatureInserter;
import org.geotools.process.spatialstatistics.util.CoordinateTranslateFilter;
import org.geotools.util.logging.Logging;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.expression.Expression;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.operation.MathTransform;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.Polygon;
/**
* Performs rectangular binning.
*
* @author Minpa Lee, MangoSystem
*
* @source $URL$
*
*/
public class RectangularBinningOperation extends BinningOperation {
protected static final Logger LOGGER = Logging.getLogger(RectangularBinningOperation.class);
static final String TYPE_NAME = "RectangularBinning";
public SimpleFeatureCollection execute(SimpleFeatureCollection features,
ReferencedEnvelope bbox, Double width, Double height) throws IOException {
return execute(features, null, bbox, width, height);
}
public SimpleFeatureCollection execute(SimpleFeatureCollection features, Expression weight,
ReferencedEnvelope bbox, Double width, Double height) throws IOException {
if (bbox == null) {
throw new NullPointerException("bbox parameter is null");
}
int columns = (int) Math.floor((bbox.getWidth() / width) + 0.5d);
int rows = (int) Math.floor((bbox.getHeight() / height) + 0.5d);
columns = columns * width < bbox.getWidth() ? columns + 1 : columns;
rows = rows * height < bbox.getHeight() ? rows + 1 : rows;
// recalculate envelope : origin = lower left
CoordinateReferenceSystem targetCRS = bbox.getCoordinateReferenceSystem();
ReferencedEnvelope finalBBox = new ReferencedEnvelope(targetCRS);
finalBBox.init(bbox.getMinX(), bbox.getMinX() + (columns * width), bbox.getMinY(),
bbox.getMinY() + (rows * height));
return execute(features, weight, bbox, columns, rows);
}
public SimpleFeatureCollection execute(SimpleFeatureCollection features,
ReferencedEnvelope bbox, Integer columns, Integer rows) throws IOException {
return execute(features, null, bbox, columns, rows);
}
public SimpleFeatureCollection execute(SimpleFeatureCollection features, Expression weight,
ReferencedEnvelope bbox, Integer columns, Integer rows) throws IOException {
if (bbox == null) {
throw new NullPointerException("bbox parameter is null");
}
// check crs
CoordinateReferenceSystem sourceCRS = features.getSchema().getCoordinateReferenceSystem();
CoordinateReferenceSystem targetCRS = bbox.getCoordinateReferenceSystem();
MathTransform transform = findMathTransform(sourceCRS, targetCRS, true);
GeometryCoordinateSequenceTransformer transformer = new GeometryCoordinateSequenceTransformer();
// create feature type
SimpleFeatureType schema = FeatureTypes.getDefaultType(TYPE_NAME, Polygon.class, sourceCRS);
schema = FeatureTypes.add(schema, UID, Integer.class, 19);
schema = FeatureTypes.add(schema, AGG_FIELD, Double.class, 38);
final double width = bbox.getWidth() / columns;
final double height = bbox.getHeight() / rows;
final double minX = bbox.getMinX();
final double minY = bbox.getMinY();
int minCol = Integer.MAX_VALUE, minRow = Integer.MAX_VALUE;
int maxCol = Integer.MIN_VALUE, maxRow = Integer.MIN_VALUE;
// calculate grids & values
Double gridValues[][] = new Double[rows][columns];
SimpleFeatureIterator featureIter = features.features();
try {
if (transform != null) {
transformer.setMathTransform(transform);
transformer.setCoordinateReferenceSystem(targetCRS);
}
while (featureIter.hasNext()) {
SimpleFeature feat = featureIter.next();
Double val = weight == null ? Double.valueOf(1.0) : weight.evaluate(feat,
Double.class);
if (val == null) {
continue;
}
Geometry geometry = (Geometry) feat.getDefaultGeometry();
if (transform != null) {
// project source geometry to targetCRS
geometry = transform(transformer, geometry);
}
Coordinate coordinate = geometry.getCentroid().getCoordinate();
// origin = lower left
int col = (int) Math.floor((coordinate.x - minX) / width);
int row = (int) Math.floor((coordinate.y - minY) / height);
if (col < 0 || row < 0 || col >= columns || row >= rows) {
continue;
}
Double preVal = gridValues[row][col];
gridValues[row][col] = preVal == null ? val : preVal + val;
if (getOnlyValidGrid()) {
minCol = Math.min(col, minCol);
maxCol = Math.max(col, maxCol);
minRow = Math.min(row, minRow);
maxRow = Math.max(row, maxRow);
}
}
} finally {
featureIter.close();
}
// write features
IFeatureInserter featureWriter = getFeatureWriter(schema);
try {
if (transform != null) {
transformer.setMathTransform(transform.inverse());
transformer.setCoordinateReferenceSystem(sourceCRS);
}
if (getOnlyValidGrid()) {
maxCol++;
maxRow++;
} else {
minCol = 0;
maxCol = columns;
minRow = 0;
maxRow = rows;
}
ReferencedEnvelope bounds = new ReferencedEnvelope(targetCRS);
bounds.init(minX, minX + width, minY, minY + height);
Geometry rectangle = gf.toGeometry(bounds);
int featureID = 0;
double ypos = minRow * height;
for (int row = minRow; row < maxRow; row++) {
double xpos = minCol * width;
for (int col = minCol; col < maxCol; col++) {
Double gridValue = gridValues[row][col];
if (gridValue == null && getOnlyValidGrid()) {
xpos += width;
continue;
}
Geometry grid = (Geometry) rectangle.clone();
grid.apply(new CoordinateTranslateFilter(xpos, ypos));
grid.setUserData(targetCRS);
if (transform != null) {
// reproject grid geometry to sourceCRS
grid = transform(transformer, grid);
}
// create feature and set geometry
SimpleFeature newFeature = featureWriter.buildFeature();
newFeature.setAttribute(UID, featureID);
newFeature.setAttribute(AGG_FIELD, gridValue);
newFeature.setDefaultGeometry(grid);
featureWriter.write(newFeature);
xpos += width;
}
ypos += height;
}
} catch (Exception e) {
featureWriter.rollback(e);
} finally {
featureWriter.close();
}
return featureWriter.getFeatureCollection();
}
}