//+++++++++++++++++++++++++++CORDENADES var pi = 3.14159265358979; var sm_a = 6378137.0; var sm_b = 6356752.314; var sm_EccSquared = 6.69437999013e-03; var UTMScaleFactor = 0.9996; var i=0; function FootpointLatitude (y) { var y_, alpha_, beta_, gamma_, delta_, epsilon_, n; var result; n = (sm_a - sm_b) / (sm_a + sm_b); alpha_ = ((sm_a + sm_b) / 2.0) * (1 + (Math.pow (n, 2.0) / 4) + (Math.pow (n, 4.0) / 64)); y_ = y / alpha_; beta_ = (3.0 * n / 2.0) + (-27.0 * Math.pow (n, 3.0) / 32.0) + (269.0 * Math.pow (n, 5.0) / 512.0); gamma_ = (21.0 * Math.pow (n, 2.0) / 16.0) + (-55.0 * Math.pow (n, 4.0) / 32.0); delta_ = (151.0 * Math.pow (n, 3.0) / 96.0) + (-417.0 * Math.pow (n, 5.0) / 128.0); epsilon_ = (1097.0 * Math.pow (n, 4.0) / 512.0); 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; } 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; phif = FootpointLatitude (y); ep2 = (Math.pow (sm_a, 2.0) - Math.pow (sm_b, 2.0)) / Math.pow (sm_b, 2.0); cf = Math.cos (phif); nuf2 = ep2 * Math.pow (cf, 2.0); Nf = Math.pow (sm_a, 2.0) / (sm_b * Math.sqrt (1 + nuf2)); Nfpow = Nf; tf = Math.tan (phif); tf2 = tf * tf; tf4 = tf2 * tf2; x1frac = 1.0 / (Nfpow * cf); Nfpow *= Nf; x2frac = tf / (2.0 * Nfpow); Nfpow *= Nf; x3frac = 1.0 / (6.0 * Nfpow * cf); Nfpow *= Nf; x4frac = tf / (24.0 * Nfpow); Nfpow *= Nf; x5frac = 1.0 / (120.0 * Nfpow * cf); Nfpow *= Nf; x6frac = tf / (720.0 * Nfpow); Nfpow *= Nf; x7frac = 1.0 / (5040.0 * Nfpow * cf); Nfpow *= Nf; x8frac = tf / (40320.0 * Nfpow); 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); 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); 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 UTMCentralMeridian (zone) { var cmeridian; cmeridian = DegToRad (-183.0 + (zone * 6.0)); return cmeridian; } function UTMXYToLatLon (x, y, zone, southhemi, latlon) { var cmeridian; x -= 500000.0; x /= UTMScaleFactor; if (southhemi) y -= 10000000.0; y /= UTMScaleFactor; cmeridian = UTMCentralMeridian (zone); MapXYToLatLon (x, y, cmeridian, latlon); return; } function DegToRad (deg) { return (deg / 180.0 * pi) } function RadToDeg (rad) { return (rad / pi * 180.0) } 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 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 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; return zone; } //++++++++++++++++++++++++