@seasketch/geoprocessing/dist/src/toolbox/antimeridian.js

Geoprocessing and reporting framework for SeaSketch 2.0

import { bbox } from "@turf/turf";
import { cleanCoords } from "./cleanCoords.js";
import splitGeojson from "geojson-antimeridian-cut";
/**
 * Splits a Feature or FeatureCollection on the 180 degree antimeridian.
 * The bbox property of the result will have longitude coordinates that are
 * shifted/normalized to be within the range of -180 to 180.
 * @param feature the feature or feature collection to split
 * @returns the split feature or feature collection
 */
export function splitFeatureAntimeridian(feature) {
    // Ensure coordinate positions are within -180 to 180 longitude, -90 to 90 latitude
    const cleanFeatures = cleanCoords(feature);
    cleanFeatures.bbox = bbox(cleanFeatures);
    // Split feature on antimeridian.  If it doesn't cross simply returns original polygon
    const splitFeatures = splitGeojson(cleanFeatures);
    splitFeatures.bbox = bbox(cleanFeatures);
    return splitFeatures;
}
/**
 * Splits a Sketch or SketchCollection on the 180 degree antimeridian
 * The bbox property of the result will have longitude coordinates that are
 * shifted/normalized to be within the range of -180 to 180.
 * @param sketch the sketch or sketch collection to split
 * @returns the split sketch or sketch collection
 */
export function splitSketchAntimeridian(sketch) {
    // Ensure coordinate positions are within -180 to 180 longitude, -90 to 90 latitude
    const cleanFeatures = cleanCoords(sketch);
    // Split sketch on antimeridian.  If it doesn't cross simply returns original polygon
    const splitFeatures = splitGeojson(cleanFeatures, { mutate: true });
    splitFeatures.bbox = bbox(cleanFeatures);
    return splitFeatures;
}
/**
 * If bounding box crosses antimeridian (and extends outside the range of -180 to 180),
 * split it into two bounding boxes at the antimeridian.
 * @param bbox the bounding box to split
 * @returns array of one or two bounding boxes
 */
export function splitBBoxAntimeridian(bbox) {
    const [minX, minY, maxX, maxY] = cleanBBox(bbox);
    // If the normalized bbox crosses the antimeridian, splitting is needed
    if (minX > maxX) {
        return [
            [minX, minY, 180, maxY],
            [-180, minY, maxX, maxY],
        ];
    }
    else {
        return [bbox];
    }
}
/**
 * Normalizes bounding box longitude values to the [-180, 180] range if they cross the antimeridian
 * @param bbox the bounding box to clean
 * @returns the cleaned bounding box
 */
export function cleanBBox(bbox) {
    const [minX, minY, maxX, maxY] = bbox;
    // Normalize longitudes to the [-180, 180] range if needed
    const normMinX = ((((minX + 180) % 360) + 360) % 360) - 180;
    const normMaxX = ((((maxX + 180) % 360) + 360) % 360) - 180;
    return [normMinX, minY, normMaxX, maxY];
}
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