geojson-tile-server
Version:
A simple tile service, that takes one or more GeoJSON files and offers them as slippy maps in MVT, VT or GeoJSON format.
103 lines • 4.58 kB
JavaScript
;
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
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function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
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}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.createTileIndex = exports.findGeojsonFilesInFolder = exports.loadGeoJSON = void 0;
var fs = require("fs");
var path = require("path");
var geojsonvt = require("geojson-vt");
/**
* Load a GeoJSON file
*
* @param {string} file
* @returns
*/
exports.loadGeoJSON = function (file) {
return new Promise(function (resolve, reject) {
fs.readFile(file, 'utf-8', function (err, data) {
if (err) {
reject(err);
}
else {
resolve(JSON.parse(data));
}
});
});
};
/**
* Get all GeoJSON files in a folder
*
* @param {string} folder
* @returns
*/
exports.findGeojsonFilesInFolder = function (folder) {
return fs
.readdirSync(folder)
.map(function (f) { return path.join(folder, f); })
.filter(function (f) {
var ext = path.extname(f);
return ext && (ext.toLowerCase() === '.geojson' || ext.toLowerCase() === '.json');
});
};
/**
* Create a tile index using geojson-vt
*
* @param {string} filename
* @returns
*/
exports.createTileIndex = function (filename, options) { return __awaiter(void 0, void 0, void 0, function () {
var geoJSON;
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, exports.loadGeoJSON(filename)];
case 1:
geoJSON = _a.sent();
return [2 /*return*/, geojsonvt(geoJSON, Object.assign({
maxZoom: 22,
tolerance: 3,
extent: 4096,
buffer: 64,
debug: 0,
generateId: true,
indexMaxZoom: 4,
indexMaxPoints: 100000,
solidChildren: false,
}, options))];
}
});
}); };
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