30 lines
1.3 KiB
JavaScript
30 lines
1.3 KiB
JavaScript
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export var PJD_3PARAM = 1;
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export var PJD_7PARAM = 2;
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export var PJD_GRIDSHIFT = 3;
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export var PJD_WGS84 = 4; // WGS84 or equivalent
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export var PJD_NODATUM = 5; // WGS84 or equivalent
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export var SRS_WGS84_SEMIMAJOR = 6378137.0; // only used in grid shift transforms
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export var SRS_WGS84_SEMIMINOR = 6356752.314; // only used in grid shift transforms
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export var SRS_WGS84_ESQUARED = 0.0066943799901413165; // only used in grid shift transforms
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export var SEC_TO_RAD = 4.84813681109535993589914102357e-6;
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export var HALF_PI = Math.PI/2;
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// ellipoid pj_set_ell.c
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export var SIXTH = 0.1666666666666666667;
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/* 1/6 */
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export var RA4 = 0.04722222222222222222;
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/* 17/360 */
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export var RA6 = 0.02215608465608465608;
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export var EPSLN = 1.0e-10;
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// you'd think you could use Number.EPSILON above but that makes
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// Mollweide get into an infinate loop.
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export var D2R = 0.01745329251994329577;
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export var R2D = 57.29577951308232088;
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export var FORTPI = Math.PI/4;
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export var TWO_PI = Math.PI * 2;
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// SPI is slightly greater than Math.PI, so values that exceed the -180..180
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// degree range by a tiny amount don't get wrapped. This prevents points that
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// have drifted from their original location along the 180th meridian (due to
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// floating point error) from changing their sign.
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export var SPI = 3.14159265359;
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