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A collection of tools for outdoor apps.xs
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‎.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-15">
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<attributes>
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<attribute name="module" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎.gitignore

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# Ignore these files
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.mtj.tmp/
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*.class
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*.jar
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*.war
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*.ear
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*.nar
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hs_err_pid*
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replay_pid*
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doc/

‎.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>OutDoorTools</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>

‎.settings/org.eclipse.jdt.core.prefs

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=15
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=15
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
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org.eclipse.jdt.core.compiler.release=enabled
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org.eclipse.jdt.core.compiler.source=15

‎src/Main.java

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import TimeTools.TimeDateFormat;
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import geoTools.SunriseSunset;
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import metroTools.AirPressure;
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import metroTools.DewPoint;
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/**
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* Shows a demo of the various classes....
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*
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* @author berthold
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*
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*/
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public class Main {
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private static final int DAY_OF_YEAR=260;
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private static final double LAT=54.2;
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private static final double LONG=6.12;
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private static final int TIME_ZONE=1;
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public static void main(String[] args) {
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//
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// Test of geo tools
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// Show sunrise/ sunset
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//
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int dayOfYear=DAY_OF_YEAR; //TimeDateFormat.getDayOfCurrentYear();
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System.out.println("Day of year:"+dayOfYear);
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System.out.println("Timezone:"+TimeDateFormat.getCurrentTimezoneName());
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System.out.println("Timezone:"+TimeDateFormat.getCurrentTimezoneOffset());
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System.out.println("Timezone GMT +"+TimeDateFormat.getTimeZoneOffsetIn_h());
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System.out.println("Longtitute:"+LONG+" Latitute:"+LAT);
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double dec=SunriseSunset.getSunDeclinationIn_Rad(DAY_OF_YEAR);
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System.out.println("Declination:"+SunriseSunset.toGrad(dec));
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double timeOfSunrise=SunriseSunset.getSunriseTimeAtObserversLocationIn_h(LONG, LAT, dayOfYear, TIME_ZONE);
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System.out.println("Sunrise:"+timeOfSunrise);
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System.out.println("Sunrise:"+TimeDateFormat.getTimeInTwentyFourHourFormat(timeOfSunrise));
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double timeOfSunset=SunriseSunset.getSunsetTimeAtObserversLocationIn_h(LONG, LAT, dayOfYear, TIME_ZONE);
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System.out.println("Sunset:"+timeOfSunset);
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System.out.println("Sunset:"+TimeDateFormat.getTimeInTwentyFourHourFormat(timeOfSunset));
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//
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// Metro tools
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//
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// Dew Point
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float temperature=28; // Degrees...
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float relHum=30; // percent
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float dewPoint=DewPoint.dewPointTemperature_C(temperature,relHum );
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System.out.println("Dew point:"+dewPoint+" C'");
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// Altitute from air pressure
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float refferencePressure_hPa=1000f;
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float actualPressure_hPa=996;
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float alt=AirPressure.altitude(actualPressure_hPa,refferencePressure_hPa);
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System.out.println("Altitude (relative to reffernece="+refferencePressure_hPa+")="+alt+" m");
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}
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}

‎src/TimeTools/TimeDateFormat.java

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package TimeTools;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.TimeZone;
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/**
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* A collection of utilities to format time and date.
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*
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* @author Berthold
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*
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*/
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public class TimeDateFormat {
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/**
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* Hours and minutes.
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*
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* @param Representing the time in hours and minutes.
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* @return A String containing the hours and minutes from a double precission
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* value providing the time in decimal format.
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*/
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public static String getTimeInTwentyFourHourFormat(double timeIn_h) {
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int hours = (int) timeIn_h;
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int minutes = (int) (timeIn_h % 1 * 60);
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return String.format("%02d", hours) + ":" + String.format("%02d", minutes);
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}
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/**
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* Day of current year
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*
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* @return Day of the current year for the current date. 1st of January=1.
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*/
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public static int getDayOfCurrentYear() {
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Calendar cal = Calendar.getInstance();
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return cal.get(Calendar.DAY_OF_YEAR);
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}
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/**
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* Current time zone short format.
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*
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* @return E.g. "Central Europeean Time".
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*/
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public static String getCurrentTimezoneName() {
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TimeZone timeZone = TimeZone.getDefault();
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return timeZone.getDisplayName();
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}
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/**
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* Current time zone long format with city.
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*
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* @return Region/ City. E.g. "Europe/ Berlin"
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*/
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public static String getCurrentTimezoneOffset() {
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TimeZone timeZone = TimeZone.getDefault();
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return timeZone.getID();
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}
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/**
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* Offset in hours relative to GMT (Greenwich mean time).
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*
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* @return Offset in hours.
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*/
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public static int getTimeZoneOffsetIn_h() {
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TimeZone timeZone = TimeZone.getDefault();
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return timeZone.getOffset(new Date().getTime()) / 1000 / 60 / 60;
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}
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/**
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* @return Current time in decimal format.
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*/
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public static double getCurrentTimeInDec() {
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Calendar cal = Calendar.getInstance();
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double h = cal.get(Calendar.HOUR_OF_DAY);
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double m = cal.get(Calendar.MINUTE);
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return (h + (m / 60));
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}
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}

‎src/geoTools/SunriseSunset.java

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package geoTools;
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/**
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* Calculates the time of sunrise or sunset
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* at a given longitude and latititude.<p>
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*
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* Formulas are taken from: {@link https://lexikon.astronomie.info/zeitgleichung/index.html}
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*
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* @author Berthold Fritz
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*
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*/
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public class SunriseSunset {
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private static final double sunsetDecIn_Minutes=-0.0145; // Dec of sun below local lat for sunset
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private static final double NOON=12;
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/**
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* Convert degrees to radians.
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*
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* @param grad
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* @return Given angle in degrees converted to radians.
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*/
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public static double toRad (double grad){
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return grad*Math.PI/180;
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}
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/**
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* Convert radians to degrees.
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*
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* @param rad
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* @return Given angle in radians converted to degrees.
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*/
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public static double toGrad (double rad){
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return rad*180/Math.PI;
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}
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/**
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* Time of sunrise at an observers location.
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* This is a convenient way to get a quick result whithout
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* calling all methods step by step.
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*
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* @param lng Longitude in degrees.
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* @param lat Latitude in degrees.
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* @param dayOfYear Day of year (1st of January is 1).
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* @param timeZone +/- relative to Greenwich Mean time (east is +, west is -)
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* @return Time of sunrise at the given location and timezone.
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*/
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public static double getSunriseTimeAtObserversLocationIn_h(double lng,double lat,int dayOfYear,int timeZone){
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double latIn_rad=toRad(lat);
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double longIn_rad=toRad(lng);
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double declinationIn_rad=getSunDeclinationIn_Rad(dayOfYear);
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double deltaTimeIn_h=SunriseSunset.getDeltaTimeIn_h(declinationIn_rad,latIn_rad);
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double trueSunsetTimeIn_h=SunriseSunset.getTrueSunriseTimeIn_h(deltaTimeIn_h,dayOfYear);
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return getTimeAtLatitudeAndTimeZoneIn_h(trueSunsetTimeIn_h, longIn_rad, timeZone);
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}
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/**
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* Time of sunset at an observers location.
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* This is a convenient way to get a quick result whithout
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* calling all methods step by step.
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*
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* @param lng Longitude in degrees.
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* @param lat Latitude in degrees.
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* @param dayOfYear Day of year (1st of January is 1).
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* @param timeZone +/- relative to Greenwich Mean time (east is +, west is -)
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* @return Time of sunset at the given location and timezone.
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*/
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public static double getSunsetTimeAtObserversLocationIn_h(double lng,double lat,int dayOfYear,int timeZone){
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double latIn_rad=toRad(lat);
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double longIn_rad=toRad(lng);
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double declinationIn_rad=getSunDeclinationIn_Rad(dayOfYear);
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double deltaTimeIn_h=SunriseSunset.getDeltaTimeIn_h(declinationIn_rad,latIn_rad);
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double trueSunsetTimeIn_h=SunriseSunset.getTrueSunsetTimeIn_h(deltaTimeIn_h,dayOfYear);
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return getTimeAtLatitudeAndTimeZoneIn_h(trueSunsetTimeIn_h, longIn_rad, timeZone);
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}
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/**
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* Declination.
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*
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* @param dayOfYear
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* @return Declination of sun in radians at a given day of year (1=1st of january).
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*/
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public static double getSunDeclinationIn_Rad(int dayOfYear){
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return 0.4095*Math.sin(0.016906*(dayOfYear-80.086));
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}
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/**
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* Difference between true local time and avarge local time (time equation).
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*
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* @param dayOfYear
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* @return Time difference in hours.
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*/
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public static double timeEquation(int dayOfYear){
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return -0.171*Math.sin(0.0337*dayOfYear+0.465)-0.1299*Math.sin(0.01787*dayOfYear-0.168);
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}
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/**
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* Time difference.
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*
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* @param decIn_Rad
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* @return Time differnece in hours until sun reaches a given latitude from
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* it's zenit.
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*/
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public static double getDeltaTimeIn_h(double decIn_Rad,double latitudeIn_rad){
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return 12*Math.acos((Math.sin(sunsetDecIn_Minutes)-Math.sin(latitudeIn_rad)*Math.sin(decIn_Rad))/(Math.cos(0.9163)*Math.cos(decIn_Rad)))/Math.PI;
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}
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/**
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* True Sunrise time.
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*
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* @param deltaTimeIn_h
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* @return Time of sunrise in hours not compensated for average time at a given location
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* (time displayed on an observers watch).
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*/
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public static double getTrueSunriseTimeIn_h(double deltaTimeIn_h, int dayOfYear){
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return NOON-deltaTimeIn_h-timeEquation(dayOfYear);
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}
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/**
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* True Sunset time.
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*
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* @param deltaTimeIn_h
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* @return Time of sunset in hours not compensated for average time at a given location
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* (time displayed on an observers watch).
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*/
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public static double getTrueSunsetTimeIn_h(double deltaTimeIn_h,int dayOfYear){
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return NOON+deltaTimeIn_h-timeEquation(dayOfYear);
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}
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/**
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* Time at the latitude and timezone of the observer.
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*
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* @param gmtTimeIn_h
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* @param latitude
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* @param timeZoneIn_DeltaToGMTin_h
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* @return Time at a given latitude and timezone.
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*/
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public static double getTimeAtLatitudeAndTimeZoneIn_h(double gmtTimeIn_h,double latitude,int timeZoneIn_DeltaToGMTin_h){
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return gmtTimeIn_h-latitude/15+timeZoneIn_DeltaToGMTin_h;
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}
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}

‎src/metroTools/AirPressure.java

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package metroTools;
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/**
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* Metrological tools.
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*
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* @author berthold
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*
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*/
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public class AirPressure {
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/**
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* Calculates the altitude based on the actual pressure mesured at an observers position
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* relative to a reffernce pressure. Pressures units are [hPa].
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*
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* @param actualPressure_hPa Pressure measured.
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* @param reffernecePressure_hPA Refference pressure.
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* @return Altitide in [m].
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*/
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public static float altitude (float actualPressure_hPa,float reffernecePressure_hPA){
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float pow=1/5.255f;
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float alt=(float) ((288.15/0.0065)*(1-(Math.pow((actualPressure_hPa/reffernecePressure_hPA),pow))));
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return alt;
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}
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}

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