@seasketch/geoprocessing/dist/src/helpers/biggestPolygon.js

Geoprocessing and reporting framework for SeaSketch 2.0

import { area, flatten } from "@turf/turf";
/**
 * If feature is a MultiPolygon, scans and returns the polygon with the largest area.
 */
export function biggestPolygon(feature) {
    if (feature.geometry.type === "MultiPolygon") {
        // If multipolygon clip result, keep only the biggest piece
        const flattened = flatten(feature);
        let biggest = [0, 0];
        for (let i = 0; i < flattened.features.length; i++) {
            const a = area(flattened.features[i]);
            if (a > biggest[0]) {
                biggest = [a, i];
            }
        }
        return flattened.features[biggest[1]];
    }
    else {
        return feature;
    }
}
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