node-red-contrib-tak-registration
Version:
A Node-RED node to register to TAK and to help wrap files as datapackages to send to TAK
43 lines (42 loc) • 1.73 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var clone_1 = __importDefault(require("@turf/clone"));
var helpers_1 = require("@turf/helpers");
var invariant_1 = require("@turf/invariant");
var meta_1 = require("@turf/meta");
var topojson_client_1 = require("topojson-client");
var topojson_server_1 = require("topojson-server");
/**
* Dissolves all overlapping (Multi)Polygon
*
* @param {FeatureCollection<Polygon|MultiPolygon>} geojson Polygons to dissolve
* @param {Object} [options={}] Optional parameters
* @param {boolean} [options.mutate=false] Prevent input mutation
* @returns {Feature<Polygon|MultiPolygon>} Dissolved Polygons
*/
function polygonDissolve(geojson, options) {
if (options === void 0) { options = {}; }
// Validation
if (invariant_1.getType(geojson) !== "FeatureCollection") {
throw new Error("geojson must be a FeatureCollection");
}
if (!geojson.features.length) {
throw new Error("geojson is empty");
}
// Clone geojson to avoid side effects
// Topojson modifies in place, so we need to deep clone first
if (options.mutate === false || options.mutate === undefined) {
geojson = clone_1.default(geojson);
}
var geoms = [];
meta_1.flattenEach(geojson, function (feature) {
geoms.push(feature.geometry);
});
var topo = topojson_server_1.topology({ geoms: helpers_1.geometryCollection(geoms).geometry });
var merged = topojson_client_1.merge(topo, topo.objects.geoms.geometries);
return merged;
}
exports.default = polygonDissolve;