init

2026-10-21 19:32:02 -04:00
commit b74d278c8e
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+const Model = require('./lib/model.js');
+const geomagnetism = module.exports = {};
+
+const modelData = [
+	{
+		file: require('./data/wmm-2025.json'),
+		startDate: new Date("2024-11-13T03:00:00.000Z"),
+		endDate: new Date("2029-11-13T03:00:00.000Z")
+	},
+	{
+		file: require('./data/wmm-2020.json'),
+		startDate: new Date("2019-12-10T08:00:00.000Z"),
+		endDate: new Date("2024-12-10T08:00:00.000Z")
+	},
+	{
+		file: require('./data/wmm-2015v2.json'),
+		startDate: new Date("2018-09-18T06:00:00.000Z"),
+		endDate: new Date("2023-09-18T06:00:00.000Z")
+	},
+	{
+		file: require('./data/wmm-2015.json'),
+		startDate: new Date("2014-12-15T07:00:00.000Z"),
+		endDate: new Date("2019-12-15T07:00:00.000Z")
+	}
+];
+
+
+geomagnetism.model = function (date, options = {}) {
+	date = date || new Date();
+	const ts = date.getTime();
+
+	const allowOutOfBoundsModel = (options && options.allowOutOfBoundsModel) || false;
+
+	// Get the latest matching model 
+	let matchingModelData = modelData.find((model) => {
+		return ts >= model.startDate.getTime() && ts <= model.endDate.getTime();
+	});
+
+	// Get if the date is before the first model or after the last model
+	if (!matchingModelData && ts < modelData[modelData.length - 1].startDate.getTime()) {
+		matchingModelData = modelData[modelData.length - 1];
+	} else if (!matchingModelData && ts > modelData[0].endDate.getTime()) {
+		matchingModelData = modelData[0];
+	}
+
+	// If no matching model found, use the latest
+	if (!matchingModelData) {
+		matchingModelData = modelData[0]; // latest (will throw error if allowOutOfBoundsModel is true)
+	}
+
+	const matchingModel = new Model(matchingModelData.file);
+
+	return matchingModel.getTimedModel(date, allowOutOfBoundsModel);
+};