hmpps-open-layers-map/dist/converters/mdssPositionsToGeoJson.js

A native Web Component for displaying maps using OpenLayers.

// Convert MDSS positions into a GeoJSON FeatureCollection.
export function mdssPositionsToGeoJson(positions) {
    if (!positions || positions.length === 0) {
        return { type: 'FeatureCollection', features: [] };
    }
    const pointFeatures = positions.map(pos => ({
        type: 'Feature',
        id: pos.positionId.toString(),
        geometry: {
            type: 'Point',
            coordinates: [pos.longitude, pos.latitude],
        },
        properties: {
            '@id': pos.positionId.toString(),
            confidence: pos.precision,
            speed: pos.speed,
            direction: pos.direction,
            timestamp: pos.timestamp,
            geolocationMechanism: pos.geolocationMechanism,
            sequenceNumber: pos.sequenceNumber,
            type: 'mdss-location',
        },
    }));
    const lineFeatures = [];
    positions.forEach((current, index) => {
        if (index < positions.length - 1) {
            const next = positions[index + 1];
            lineFeatures.push({
                type: 'Feature',
                id: `${current.positionId}-${next.positionId}`,
                geometry: {
                    type: 'LineString',
                    coordinates: [
                        [current.longitude, current.latitude],
                        [next.longitude, next.latitude],
                    ],
                },
                properties: {
                    '@id': `${current.positionId}-${next.positionId}`,
                    direction: current.direction,
                    type: 'mdss-line',
                },
            });
        }
    });
    return {
        type: 'FeatureCollection',
        features: [...pointFeatures, ...lineFeatures],
    };
}