40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
import {PJD_3PARAM, PJD_7PARAM, PJD_GRIDSHIFT, PJD_WGS84, PJD_NODATUM, SEC_TO_RAD} from './constants/values';
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function datum(datumCode, datum_params, a, b, es, ep2, nadgrids) {
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var out = {};
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if (datumCode === undefined || datumCode === 'none') {
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out.datum_type = PJD_NODATUM;
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} else {
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out.datum_type = PJD_WGS84;
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}
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if (datum_params) {
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out.datum_params = datum_params.map(parseFloat);
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if (out.datum_params[0] !== 0 || out.datum_params[1] !== 0 || out.datum_params[2] !== 0) {
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out.datum_type = PJD_3PARAM;
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}
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if (out.datum_params.length > 3) {
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if (out.datum_params[3] !== 0 || out.datum_params[4] !== 0 || out.datum_params[5] !== 0 || out.datum_params[6] !== 0) {
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out.datum_type = PJD_7PARAM;
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out.datum_params[3] *= SEC_TO_RAD;
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out.datum_params[4] *= SEC_TO_RAD;
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out.datum_params[5] *= SEC_TO_RAD;
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out.datum_params[6] = (out.datum_params[6] / 1000000.0) + 1.0;
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}
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}
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}
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if (nadgrids) {
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out.datum_type = PJD_GRIDSHIFT;
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out.grids = nadgrids;
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}
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out.a = a; //datum object also uses these values
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out.b = b;
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out.es = es;
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out.ep2 = ep2;
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return out;
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}
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export default datum;
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