Mercurial > dive4elements > river
view artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentDensity.java @ 7026:675fa2d16544
Cosmetics, typo fix in comment.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Mon, 16 Sep 2013 17:28:34 +0200 |
parents | 7be97faf5848 |
children | 483cae8915f6 |
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/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde * Software engineering by Intevation GmbH * * This file is Free Software under the GNU AGPL (>=v3) * and comes with ABSOLUTELY NO WARRANTY! Check out the * documentation coming with Dive4Elements River for details. */ package org.dive4elements.river.artifacts.model.minfo; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set; import org.apache.log4j.Logger; public class SedimentDensity { private static final Logger logger = Logger .getLogger(SedimentDensity.class); private Map<Integer, List<SedimentDensityValue>> densities; private List<Integer> years; public SedimentDensity() { this.densities = new HashMap<Integer, List<SedimentDensityValue>>(); this.years = new ArrayList<Integer>(); } public Map<Integer, List<SedimentDensityValue>> getDensities() { return densities; } public void setDensities(Map<Integer, List<SedimentDensityValue>> densities) { this.densities = densities; } public void addDensity(double km, double density, int year) { logger.debug("adding " + year); if (this.densities.containsKey(year)) { List<SedimentDensityValue> list = this.densities.get(year); list.add(new SedimentDensityValue(km, density, year)); } else { List<SedimentDensityValue> list = new ArrayList<SedimentDensityValue>(); list.add(new SedimentDensityValue(km, density, year)); densities.put(year, list); } if (!this.years.contains(new Integer(year))) { logger.debug("new year"); years.add(new Integer(year)); } } public List<Integer> getYears() { return years; } public void setYears(List<Integer> years) { this.years = years; } /** * Get the density at year. * measured densities are valid until the next measurement. * if no measurement was found 1.8 is returned. */ public double getDensity(double km, int year) { Collections.sort(this.years); if (this.years.size() == 1 && years.get(0) <= year) { logger.debug("get density from year " + year + " at km " + km); return getDensityAtKm(densities.get(years.get(0)), km); } else if (this.years.size() > 1) { for (int i = 0; i < years.size() -1; i++) { int y1 = years.get(i); int y2 = years.get(i + 1); if (year >= y1 && year < y2) { return getDensityAtKm(densities.get(y1), km); } else if (year >= y2 && i == years.size() -1) { return getDensityAtKm(densities.get(y2), km); } } } return 1.8d; } private double getDensityAtKm( List<SedimentDensityValue> values, double km ) { SedimentDensityValue prev = null; SedimentDensityValue next = null; for (SedimentDensityValue sdv: values) { logger.debug("year: " + sdv.getYear()); if (Math.abs(sdv.getKm() - km) < 0.00001) { return prev.getDensity(); } if (sdv.getKm() > km) { next = sdv; break; } prev = sdv; } return spline(prev, next, km); } private static double spline( SedimentDensityValue prev, SedimentDensityValue next, double km ) { if (prev == null && next == null) { logger.warn("prev and next are null -> NaN"); return Double.NaN; } if (prev == null) return next.getDensity(); if (next == null) return prev.getDensity(); // XXX: This is no spline interpolation! double lower = prev.getKm(); double upper = next.getKm(); double upperDensity = next.getDensity(); double lowerDensity = prev.getDensity(); double m = (upperDensity - lowerDensity)/(upper - lower); double b = lowerDensity - (m * lower); return m * km + b; } /** If multiple values for same year and station are found, * build and store average, dismiss multiple values. */ public void cleanUp() { Set<Integer> keys = densities.keySet(); // Walk over years for (Integer key : keys) { List<SedimentDensityValue> list = densities.get(key); if (list.size() == 0) { return; } List<SedimentDensityValue> cleaned = new ArrayList<SedimentDensityValue>(); double prevkm = list.get(0).getKm(); int counter = 0; double sum = 0d; for (SedimentDensityValue value : list) { // Apparently we can assume that values are ordered by km. if (value.getKm() == prevkm) { sum += value.getDensity(); counter++; } else { cleaned.add(new SedimentDensityValue( prevkm, sum / counter, value.getYear())); sum = value.getDensity(); counter = 1; } prevkm = value.getKm(); } this.densities.put(key, cleaned); } } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :