package org.mapdroid.utils;
import android.os.Bundle;
import com.google.android.maps.GeoPoint;
public class GeoPointConversion{
private static final double deg2rad = Math.PI / 180;
private static final double rad2deg = 180.0 / Math.PI;
//These values describes the model we're using for our computation.
//We're using the WGS-84 Ellipsoid Model!
private static final double a = 6378137; //Equatorial Radius
private static final double eccSquared = 0.00669438; //Eccentricity Squared
//-----------------------------------------------------------------
private static final double k0 = 0.9996; //Scale along central meridian of zone
public static final String UTM_ZONE = "UTM_ZONE";
public static final String UTM_VALUE = "UTM_VALUE";
//Constructor
public GeoPointConversion(){}
public static Bundle geoPointToUTM(GeoPoint point){
//converts lat/long to UTM coords. Equations from USGS Bulletin 1532
//East Longitudes are positive, West longitudes are negative.
//North latitudes are positive, South latitudes are negative
//Lat and Long are in decimal degrees
//Written by Chuck Gantz- chuck.gantz@globalstar.com
double lonOrigin; //Central Meridian of zone
double eccPrimeSquared;
double N, T, C, A, M;
double lat = point.getLatitudeE6()/1E6;
double lon = point.getLongitudeE6()/1E6;
//Make sure the longitude is between -180.00 .. 179.9
double lonTemp = (lon+180)-(int)((lon+180)/360)*360-180; // -180.00 .. 179.9;
double latRad = lat*deg2rad;
double lonRad = lonTemp*deg2rad;
double lonOriginRad;
int zoneNumber;
String utmZone;
double[] utm = {0,0};
zoneNumber = (int)((lonTemp + 180)/6) + 1;
if( lat >= 56.0 && lat < 64.0 && lonTemp >= 3.0 && lonTemp < 12.0 )
zoneNumber = 32;
// Special zones for Svalbard
if( lat >= 72.0 && lat < 84.0 ){
if( lonTemp >= 0.0 && lonTemp < 9.0 ) zoneNumber = 31;
else if( lonTemp >= 9.0 && lonTemp < 21.0 ) zoneNumber = 33;
else if( lonTemp >= 21.0 && lonTemp < 33.0 ) zoneNumber = 35;
else if( lonTemp >= 33.0 && lonTemp < 42.0 ) zoneNumber = 37;
}
lonOrigin = (zoneNumber - 1)*6 - 180 + 3; //+3 puts origin in middle of zone
lonOriginRad = lonOrigin * deg2rad;
//compute the UTM Zone from the latitude and longitude
utmZone = Integer.toString(zoneNumber) + UTMLetterDesignator(lat);
eccPrimeSquared = (eccSquared)/(1-eccSquared);
N = a / Math.sqrt(1 - eccSquared * Math.sin(latRad) * Math.sin(latRad));
T = Math.tan(latRad) * Math.tan(latRad);
C = eccPrimeSquared * Math.cos(latRad) * Math.cos(latRad);
A = Math.cos(latRad) * (lonRad - lonOriginRad);
M = a*((1 - eccSquared/4 - 3*eccSquared*eccSquared/64 - 5*eccSquared*eccSquared*eccSquared / 256)*latRad
- (3*eccSquared/8 + 3*eccSquared*eccSquared/32 + 45*eccSquared*eccSquared*eccSquared/1024)*Math.sin(2*latRad)
+ (15*eccSquared*eccSquared/256 + 45*eccSquared*eccSquared*eccSquared/1024)*Math.sin(4*latRad)
- (35*eccSquared*eccSquared*eccSquared/3072)*Math.sin(6*latRad));
utm[0] = (double)(k0*N*(A+(1-T+C)*A*A*A/6
+ (5-18*T+T*T+72*C-58*eccPrimeSquared)*A*A*A*A*A/120)
+ 500000.0);
utm[1] = (double)(k0*(M+N*Math.tan(latRad)*(A*A/2+(5-T+9*C+4*C*C)*A*A*A*A/24
+ (61-58*T+T*T+600*C-330*eccPrimeSquared)*A*A*A*A*A*A/720)));
if(lat < 0)
utm[1] += 10000000.0; //10000000 meter offset for southern hemisphere
Bundle bundle = new Bundle();
bundle.putString(GeoPointConversion.UTM_ZONE, utmZone);
bundle.putDoubleArray(GeoPointConversion.UTM_VALUE, utm);
return bundle;
}
private static char UTMLetterDesignator(double Lat){
//This routine determines the correct UTM letter designator for the given latitude
//returns 'Z' if latitude is outside the UTM limits of 84N to 80S
//Written by Chuck Gantz- chuck.gantz@globalstar.com
char LetterDesignator;
if((84 >= Lat) && (Lat >= 72)) LetterDesignator = 'X';
else if((72 > Lat) && (Lat >= 64)) LetterDesignator = 'W';
else if((64 > Lat) && (Lat >= 56)) LetterDesignator = 'V';
else if((56 > Lat) && (Lat >= 48)) LetterDesignator = 'U';
else if((48 > Lat) && (Lat >= 40)) LetterDesignator = 'T';
else if((40 > Lat) && (Lat >= 32)) LetterDesignator = 'S';
else if((32 > Lat) && (Lat >= 24)) LetterDesignator = 'R';
else if((24 > Lat) && (Lat >= 16)) LetterDesignator = 'Q';
else if((16 > Lat) && (Lat >= 8)) LetterDesignator = 'P';
else if(( 8 > Lat) && (Lat >= 0)) LetterDesignator = 'N';
else if(( 0 > Lat) && (Lat >= -8)) LetterDesignator = 'M';
else if((-8> Lat) && (Lat >= -16)) LetterDesignator = 'L';
else if((-16 > Lat) && (Lat >= -24)) LetterDesignator = 'K';
else if((-24 > Lat) && (Lat >= -32)) LetterDesignator = 'J';
else if((-32 > Lat) && (Lat >= -40)) LetterDesignator = 'H';
else if((-40 > Lat) && (Lat >= -48)) LetterDesignator = 'G';
else if((-48 > Lat) && (Lat >= -56)) LetterDesignator = 'F';
else if((-56 > Lat) && (Lat >= -64)) LetterDesignator = 'E';
else if((-64 > Lat) && (Lat >= -72)) LetterDesignator = 'D';
else if((-72 > Lat) && (Lat >= -80)) LetterDesignator = 'C';
else LetterDesignator = 'Z'; //This is here as an error flag to show that the Latitude is outside the UTM limits
return LetterDesignator;
}
public static GeoPoint utmToGeoPoint(double utmEasting, double utmNorthing, String utmZone){
//converts UTM coords to lat/long. Equations from USGS Bulletin 1532
//East Longitudes are positive, West longitudes are negative.
//North latitudes are positive, South latitudes are negative
//Lat and Long are in decimal degrees.
//Written by Chuck Gantz- chuck.gantz@globalstar.com
double eccPrimeSquared;
double e1 = (1-Math.sqrt(1-eccSquared))/(1+Math.sqrt(1-eccSquared));
double N1, T1, C1, R1, D, M;
double lonOrigin;
double mu, /*phil,*/ phi1Rad;
double x, y;
int zoneNumber;
char zoneLetter;
//int NorthernHemisphere; //1 for northern hemispher, 0 for southern
x = utmEasting - 500000.0; //remove 500,000 meter offset for longitude
y = utmNorthing;
CharSequence utmZoneCopy = utmZone;
zoneLetter = utmZoneCopy.charAt(utmZoneCopy.length()-1);
CharSequence zoneNumberString = utmZoneCopy.subSequence(0, utmZoneCopy.length()-1);
zoneNumber = Integer.parseInt((String) zoneNumberString);
if((zoneLetter - 'N') >= 0){}
//NorthernHemisphere = 1;//point is in northern hemisphere
else
{
//NorthernHemisphere = 0;//point is in southern hemisphere
y -= 10000000.0;//remove 10,000,000 meter offset used for southern hemisphere
}
lonOrigin = (zoneNumber - 1)*6 - 180 + 3; //+3 puts origin in middle of zone
eccPrimeSquared = (eccSquared)/(1-eccSquared);
M = y / k0;
mu = M/(a*(1-eccSquared/4-3*eccSquared*eccSquared/64-5*eccSquared*eccSquared*eccSquared/256));
phi1Rad = mu + (3*e1/2-27*e1*e1*e1/32)*Math.sin(2*mu)
+ (21*e1*e1/16-55*e1*e1*e1*e1/32)*Math.sin(4*mu)
+(151*e1*e1*e1/96)*Math.sin(6*mu);
//phi1 = phi1Rad*rad2deg;
N1 = a/Math.sqrt(1-eccSquared*Math.sin(phi1Rad)*Math.sin(phi1Rad));
T1 = Math.tan(phi1Rad)*Math.tan(phi1Rad);
C1 = eccPrimeSquared*Math.cos(phi1Rad)*Math.cos(phi1Rad);
R1 = a*(1-eccSquared)/Math.pow(1-eccSquared*Math.sin(phi1Rad)*Math.sin(phi1Rad), 1.5);
D = x/(N1*k0);
double lat = phi1Rad - (N1*Math.tan(phi1Rad)/R1)*(D*D/2-(5+3*T1+10*C1-4*C1*C1-9*eccPrimeSquared)*D*D*D*D/24
+(61+90*T1+298*C1+45*T1*T1-252*eccPrimeSquared-3*C1*C1)*D*D*D*D*D*D/720);
lat = lat * rad2deg;
double lon = (D-(1+2*T1+C1)*D*D*D/6+(5-2*C1+28*T1-3*C1*C1+8*eccPrimeSquared+24*T1*T1)
*D*D*D*D*D/120)/Math.cos(phi1Rad);
lon = lonOrigin + lon * rad2deg;
return new GeoPoint((int)(lat*1E6), (int)(lon*1E6));
}
}
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