" + p2[0]+ "." + p2[1].substring(0, 8);
}
function SEX() {
var lat, lng, labs, g, h, m, s, x, latitud, longitudg, longitudh;
lat = Math.round(parseFloat(DECx)*1e6)/1e6;
latitud = formatear_angulo(parseFloat(DECx), 2, "° ", "' ", "\" ");
x = lat > 0 ? "N " : (lat==0?"":"S ");
latitud = latitud + x;
lng = Math.round(parseFloat(DECy)*1e6)/1e6;
longitudg = formatear_angulo(parseFloat(DECy), 2, "° ", "' ", "\" ");
x = lng < 0 ? "W" : (lng==0?"":"E");
longitudg = longitudg + x;
longitudh = formatear_angulo(parseFloat(DECy)/15, 3, "
");
x = lng < 0 ? "-" : "+";
longitudh = x + longitudh;
SEXx=latitud;
SEXy=longitudg;
var p1, p2;
document.getElementById("coordstxt").innerHTML= '
Latitud: ' + SEXx.toString() + "
Longitud: " + SEXy.toString();
}
function UTM(){
var zne;
var xy = new Array(2);
xy[0]=DECx;
xy[1]=DECy;
if (DECx < 0){hem="Sur";}else{hem="Norte";}
zne = Math.floor ((DECy + 180.0) / 6) + 1
zone = LatLonToUTMXY (DegToRad (DECx), DegToRad (DECy), zne, xy);
}
function UTMCentralMeridian (zone)
{
var cmeridian;
cmeridian = DegToRad (-183.0 + (zone * 6.0));
return cmeridian;
}
function RadToDeg (rad)
{
return (rad / pi * 180.0)
}
function DegToRad (deg)
{
return (deg / 180.0 * pi)
}
function LatLonToUTMXY (lat, lon, zone, xy)
{
MapLatLonToXY (lat, lon, UTMCentralMeridian (zone), xy);
/* Adjust easting and northing for UTM system. */
xy[0] = xy[0] * UTMScaleFactor + 500000.0;
xy[1] = xy[1] * UTMScaleFactor;
if (xy[1] < 0.0)
xy[1] = xy[1] + 10000000.0;
var p1, p2;
var tstlat=xy[0].toString();
var tstlng=xy[1].toString();
p1=tstlat.split(".");
p2=tstlng.split(".");
var txt="
Zona: "+ zone + " (" + hem +")";
document.getElementById("coordstxt").innerHTML= '
Latitud: ' + p1[0]+"."+p1[1].substring(0, 2) + " Longitud: " + p2[0]+"."+p2[1].substring(0, 2) + "
" + txt + '
';
return zone;
}
function MapLatLonToXY (phi, lambda, lambda0, xy)
{
var N, nu2, ep2, t, t2, l;
var l3coef, l4coef, l5coef, l6coef, l7coef, l8coef;
var tmp;
/* Precalculate ep2 */
ep2 = (Math.pow (sm_a, 2.0) - Math.pow (sm_b, 2.0)) / Math.pow (sm_b, 2.0);
/* Precalculate nu2 */
nu2 = ep2 * Math.pow (Math.cos (phi), 2.0);
/* Precalculate N */
N = Math.pow (sm_a, 2.0) / (sm_b * Math.sqrt (1 + nu2));
/* Precalculate t */
t = Math.tan (phi);
t2 = t * t;
tmp = (t2 * t2 * t2) - Math.pow (t, 6.0);
/* Precalculate l */
l = lambda - lambda0;
/* Precalculate coefficients for l**n in the equations below
so a normal human being can read the expressions for easting
and northing
-- l**1 and l**2 have coefficients of 1.0 */
l3coef = 1.0 - t2 + nu2;
l4coef = 5.0 - t2 + 9 * nu2 + 4.0 * (nu2 * nu2);
l5coef = 5.0 - 18.0 * t2 + (t2 * t2) + 14.0 * nu2
- 58.0 * t2 * nu2;
l6coef = 61.0 - 58.0 * t2 + (t2 * t2) + 270.0 * nu2
- 330.0 * t2 * nu2;
l7coef = 61.0 - 479.0 * t2 + 179.0 * (t2 * t2) - (t2 * t2 * t2);
l8coef = 1385.0 - 3111.0 * t2 + 543.0 * (t2 * t2) - (t2 * t2 * t2);
/* Calculate easting (x) */
xy[0] = N * Math.cos (phi) * l
+ (N / 6.0 * Math.pow (Math.cos (phi), 3.0) * l3coef * Math.pow (l, 3.0))
+ (N / 120.0 * Math.pow (Math.cos (phi), 5.0) * l5coef * Math.pow (l, 5.0))
+ (N / 5040.0 * Math.pow (Math.cos (phi), 7.0) * l7coef * Math.pow (l, 7.0));
/* Calculate northing (y) */
xy[1] = ArcLengthOfMeridian (phi)
+ (t / 2.0 * N * Math.pow (Math.cos (phi), 2.0) * Math.pow (l, 2.0))
+ (t / 24.0 * N * Math.pow (Math.cos (phi), 4.0) * l4coef * Math.pow (l, 4.0))
+ (t / 720.0 * N * Math.pow (Math.cos (phi), 6.0) * l6coef * Math.pow (l, 6.0))
+ (t / 40320.0 * N * Math.pow (Math.cos (phi), 8.0) * l8coef * Math.pow (l, 8.0));
return;
}
function ArcLengthOfMeridian (phi)
{
var alpha, beta, gamma, delta, epsilon, n;
var result;
/* Precalculate n */
n = (sm_a - sm_b) / (sm_a + sm_b);
/* Precalculate alpha */
alpha = ((sm_a + sm_b) / 2.0)
* (1.0 + (Math.pow (n, 2.0) / 4.0) + (Math.pow (n, 4.0) / 64.0));
/* Precalculate beta */
beta = (-3.0 * n / 2.0) + (9.0 * Math.pow (n, 3.0) / 16.0)
+ (-3.0 * Math.pow (n, 5.0) / 32.0);
/* Precalculate gamma */
gamma = (15.0 * Math.pow (n, 2.0) / 16.0)
+ (-15.0 * Math.pow (n, 4.0) / 32.0);
/* Precalculate delta */
delta = (-35.0 * Math.pow (n, 3.0) / 48.0)
+ (105.0 * Math.pow (n, 5.0) / 256.0);
/* Precalculate epsilon */
epsilon = (315.0 * Math.pow (n, 4.0) / 512.0);
/* Now calculate the sum of the series and return */
result = alpha
* (phi + (beta * Math.sin (2.0 * phi))
+ (gamma * Math.sin (4.0 * phi))
+ (delta * Math.sin (6.0 * phi))
+ (epsilon * Math.sin (8.0 * phi)));
return result;
}
function UTMXYToLatLon (x, y, zone, southhemi, latlon)
{
x -= 500000; x /= UTMScaleFactor;
if (southhemi) y -= 10000000; y /= UTMScaleFactor;
MapXYToLatLon (x, y, UTMCentralMeridian(zone), latlon);
return;
}
//-----------
function btnToUTM_OnClick ()
{var xy = new Array(2);
if (isNaN (parseFloat (document.frmConverter.txtLongitude.value)))
{ alert ("Please enter a valid longitude in the lon field.");
return false;
}
lon = parseFloat (document.frmConverter.txtLongitude.value);
if ((lon < -180) || (180 <= lon))
{ alert ("The longitude you entered is out of range. " +
"Please enter a number in the range [-180, 180).");
return false;
}
if (isNaN (parseFloat (document.frmConverter.txtLatitude.value)))
{ alert ("Please enter a valid latitude in the lat field.");
return false;
}
lat = parseFloat (document.frmConverter.txtLatitude.value);
if ((lat < -90) || (90 < lat))
{ alert ("The latitude you entered is out of range. " +
"Please enter a number in the range [-90, 90].");
return false;
}
// Compute the UTM zone.
zone = Math.floor ((lon + 180) / 6) + 1;
zone = LatLonToUTMXY (DegToRad (lat), DegToRad (lon), zone, xy);
/* Set the output controls. */
document.frmConverter.txtX.value = xy[0];
document.frmConverter.txtY.value = xy[1];
document.frmConverter.txtZone.value = zone;
if (lat < 0) // Set the S button.
document.frmConverter.rbtnHemisphere[1].checked = true;
else // Set the N button.
document.frmConverter.rbtnHemisphere[0].checked = true;
return true;
}
function LatLngToUTM (){
latlon = new Array(2);
var x, y, zone, southhemi;
x = parseFloat (lat);
y = parseFloat (lng);
zone = parseFloat (tz);
southhemi = false;
UTMXYToLatLon (x, y, zone, southhemi, latlon);
//alert(latlon[0]+"-"+latlon[1]);
var gll=new GLatLng(RadToDeg(latlon[0]),RadToDeg(latlon[1]));
map.addOverlay(new GMarker(gll));
map.setCenter(gll, 13);
}
function LatLng (){
var gll=new GLatLng(lat,lng);
map.addOverlay(new GMarker(gll));
map.setCenter(gll, 13);
}
function MapXYToLatLon (x, y, lambda0, philambda)
{
var phif, Nf, Nfpow, nuf2, ep2, tf, tf2, tf4, cf;
var x1frac, x2frac, x3frac, x4frac, x5frac, x6frac, x7frac, x8frac;
var x2poly, x3poly, x4poly, x5poly, x6poly, x7poly, x8poly;
/* Get the value of phif, the footpoint latitude. */
phif = FootpointLatitude (y);
//("phif = " + phif);
/* Precalculate ep2 */
ep2 = (Math.pow (sm_a, 2.0) - Math.pow (sm_b, 2.0))
/ Math.pow (sm_b, 2.0);
/* Precalculate cos (phif) */
cf = Math.cos (phif);
/* Precalculate nuf2 */
nuf2 = ep2 * Math.pow (cf, 2.0);
/* Precalculate Nf and initialize Nfpow */
Nf = Math.pow (sm_a, 2.0) / (sm_b * Math.sqrt (1 + nuf2));
Nfpow = Nf;
/* Precalculate tf */
tf = Math.tan (phif);
tf2 = tf * tf;
tf4 = tf2 * tf2;
/* Precalculate fractional coefficients for x**n in the equations
below to simplify the expressions for latitude and longitude. */
x1frac = 1.0 / (Nfpow * cf);
Nfpow *= Nf; /* now equals Nf**2) */
x2frac = tf / (2.0 * Nfpow);
Nfpow *= Nf; /* now equals Nf**3) */
x3frac = 1.0 / (6.0 * Nfpow * cf);
Nfpow *= Nf; /* now equals Nf**4) */
x4frac = tf / (24.0 * Nfpow);
Nfpow *= Nf; /* now equals Nf**5) */
x5frac = 1.0 / (120.0 * Nfpow * cf);
Nfpow *= Nf; /* now equals Nf**6) */
x6frac = tf / (720.0 * Nfpow);
Nfpow *= Nf; /* now equals Nf**7) */
x7frac = 1.0 / (5040.0 * Nfpow * cf);
Nfpow *= Nf; /* now equals Nf**8) */
x8frac = tf / (40320.0 * Nfpow);
/* Precalculate polynomial coefficients for x**n.
-- x**1 does not have a polynomial coefficient. */
x2poly = -1.0 - nuf2;
x3poly = -1.0 - 2 * tf2 - nuf2;
x4poly = 5.0 + 3.0 * tf2 + 6.0 * nuf2 - 6.0 * tf2 * nuf2
- 3.0 * (nuf2 *nuf2) - 9.0 * tf2 * (nuf2 * nuf2);
x5poly = 5.0 + 28.0 * tf2 + 24.0 * tf4 + 6.0 * nuf2 + 8.0 * tf2 * nuf2;
x6poly = -61.0 - 90.0 * tf2 - 45.0 * tf4 - 107.0 * nuf2
+ 162.0 * tf2 * nuf2;
x7poly = -61.0 - 662.0 * tf2 - 1320.0 * tf4 - 720.0 * (tf4 * tf2);
x8poly = 1385.0 + 3633.0 * tf2 + 4095.0 * tf4 + 1575 * (tf4 * tf2);
/* Calculate latitude */
philambda[0] = phif + x2frac * x2poly * (x * x)
+ x4frac * x4poly * Math.pow (x, 4.0)
+ x6frac * x6poly * Math.pow (x, 6.0)
+ x8frac * x8poly * Math.pow (x, 8.0);
/* Calculate longitude */
philambda[1] = lambda0 + x1frac * x
+ x3frac * x3poly * Math.pow (x, 3.0)
+ x5frac * x5poly * Math.pow (x, 5.0)
+ x7frac * x7poly * Math.pow (x, 7.0);
return;
}
function FootpointLatitude (y)
{
var y_, alpha_, beta_, gamma_, delta_, epsilon_, n;
var result;
/* Precalculate n (Eq. 10.18) */
n = (sm_a - sm_b) / (sm_a + sm_b);
/* Precalculate alpha_ (Eq. 10.22) */
/* (Same as alpha in Eq. 10.17) */
alpha_ = ((sm_a + sm_b) / 2.0)
* (1 + (Math.pow (n, 2.0) / 4) + (Math.pow (n, 4.0) / 64));
/* Precalculate y_ (Eq. 10.23) */
y_ = y / alpha_;
/* Precalculate beta_ (Eq. 10.22) */
beta_ = (3.0 * n / 2.0) + (-27.0 * Math.pow (n, 3.0) / 32.0)
+ (269.0 * Math.pow (n, 5.0) / 512.0);
/* Precalculate gamma_ (Eq. 10.22) */
gamma_ = (21.0 * Math.pow (n, 2.0) / 16.0)
+ (-55.0 * Math.pow (n, 4.0) / 32.0);
/* Precalculate delta_ (Eq. 10.22) */
delta_ = (151.0 * Math.pow (n, 3.0) / 96.0)
+ (-417.0 * Math.pow (n, 5.0) / 128.0);
/* Precalculate epsilon_ (Eq. 10.22) */
epsilon_ = (1097.0 * Math.pow (n, 4.0) / 512.0);
/* Now calculate the sum of the series (Eq. 10.21) */
result = y_ + (beta_ * Math.sin (2.0 * y_))
+ (gamma_ * Math.sin (4.0 * y_))
+ (delta_ * Math.sin (6.0 * y_))
+ (epsilon_ * Math.sin (8.0 * y_));
return result;
}