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

Geoprocessing and reporting framework for SeaSketch 2.0

import { area, featureCollection, flatten } from "@turf/turf";
import { clip } from "../toolbox/clip.js";
import { toMultiPolygon } from "./toMultiPolygon.js";
/**
 * Removes overlap between polygons and returns result as a single polygon or multipolygon
 * The result has no connection to the original features and their properties in this process
 * @param input
 * @returns
 */
export const removeOverlap = (input) => {
    const fc = Array.isArray(input) ? featureCollection(input) : input;
    // If sketches have overlap, remove it with union
    const flatColl = flatten(fc);
    const collArea = area(flatColl);
    const collUnion = clip(flatColl, "union");
    const collUnionArea = collUnion ? area(collUnion) : 0;
    const isOverlap = collUnionArea < collArea;
    const noOverlapPolygons = fc.features.length > 1 && isOverlap && collUnion
        ? collUnion
        : toMultiPolygon(flatColl);
    return noOverlapPolygons;
};
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