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