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@pka_opendynamics_2025/citylens-geo-utils

v1.0.0

Published

CityLens - Thư viện xử lý dữ liệu địa lý và GeoJSON cho đô thị thông minh

Downloads

8

Readme

CityLens Geo Utils

Thư viện xử lý dữ liệu địa lý và GeoJSON cho nền tảng CityLens Smart City.

Cài đặt

npm install @pka_opendynamics_2025/citylens-geo-utils

Sử dụng

import {
  createPoint,
  createPolygon,
  createFeature,
  distanceBetweenPoints,
  calculateCentroid,
  isPointInPolygon,
  wktPointToGeoJSON,
  HANOI_CENTER,
  isInHanoi,
} from '@pka_opendynamics_2025/citylens-geo-utils';

// Tạo GeoJSON Point
const point = createPoint(21.0285, 105.8542);

// Tính khoảng cách giữa 2 điểm
const point1 = createPoint(21.0285, 105.8542);
const point2 = createPoint(21.0378, 105.8342);
const distance = distanceBetweenPoints(point1, point2);
console.log(`Khoảng cách: ${distance.toFixed(2)} km`);

// Tạo Feature với properties
const feature = createFeature(point, {
  name: 'Hồ Hoàn Kiếm',
  type: 'lake',
});

// Chuyển đổi WKT sang GeoJSON
const geoPoint = wktPointToGeoJSON('POINT(105.8542 21.0285)');

// Kiểm tra điểm trong khu vực Hà Nội
console.log(isInHanoi(HANOI_CENTER)); // => true

// Tạo Polygon và kiểm tra điểm trong polygon
const polygon = createPolygon([
  [21.03, 105.85],
  [21.03, 105.86],
  [21.02, 105.86],
  [21.02, 105.85],
]);
console.log(isPointInPolygon(point, polygon)); // => true/false

API

Tạo GeoJSON

  • createPoint(lat, lon) - Tạo GeoJSON Point
  • createLineString(coordinates) - Tạo GeoJSON LineString
  • createPolygon(coordinates) - Tạo GeoJSON Polygon
  • createFeature(geometry, properties, id?) - Tạo GeoJSON Feature
  • createFeatureCollection(features) - Tạo GeoJSON FeatureCollection

Tính toán địa lý

  • distanceBetweenPoints(point1, point2) - Khoảng cách Haversine (km)
  • calculateCentroid(polygon) - Tính tâm điểm polygon
  • calculateBoundingBox(geometry) - Tính bounding box
  • isPointInBoundingBox(point, bbox) - Kiểm tra điểm trong bbox
  • isPointInPolygon(point, polygon) - Kiểm tra điểm trong polygon

Chuyển đổi tọa độ

  • pointToLatLng(point) - GeoJSON Point sang {lat, lng}
  • latLngToPoint(latlng) - {lat, lng} sang GeoJSON Point
  • wktPointToGeoJSON(wkt) - WKT POINT sang GeoJSON
  • geoJSONPointToWkt(point) - GeoJSON Point sang WKT

Hằng số Hà Nội

  • HANOI_BOUNDING_BOX - Bounding box khu vực Hà Nội
  • HANOI_CENTER - Tâm điểm Hà Nội (Hồ Hoàn Kiếm)
  • isInHanoi(point) - Kiểm tra điểm trong Hà Nội

Kiểu dữ liệu

interface GeoJSONPoint {
  type: 'Point';
  coordinates: [number, number]; // [longitude, latitude]
}

interface GeoJSONFeature<G, P> {
  type: 'Feature';
  geometry: G;
  properties: P;
  id?: string | number;
}

interface LatLng {
  lat: number;
  lng: number;
}

Giấy phép

GPL-3.0