Custom Coordinate System in OpenLayers 6

1. Determine the Definition of the Coordinate System

1. Visit http://epsg.io to find the coordinate system:
   

2. Select the proj4.js method to import
   

3. Copy the code

proj4.defs(
  "EPSG:4528",
  "+proj=tmerc +lat_0=0 +lon_0=120 +k=1 +x_0=40500000 +y_0=0 +ellps=GRS80 +units=m +no_defs"
);

2. Import proj4.js

Online import address (for reference): https://cdn.jsdelivr.net/npm/proj4@2.7.5/dist/proj4.js

3. Coordinate System Transformation

import { fromLonLat, transform } from "ol/proj";
import { register } from "ol/proj/proj4";

proj4.defs(
  "EPSG:4528",
  "+proj=tmerc +lat_0=0 +lon_0=120 +k=1 +x_0=40500000 +y_0=0 +ellps=GRS80 +units=m +no_defs"
);

register(proj4);

4. Test Coordinate System Transformation

ol.proj.transform([118, 32], "EPSG:4326", "EPSG:4528"); // If this test succeeds, it means the definition is successful.

Reference article: https://www.jianshu.com/p/9eca1bc8a12d

AI Translation | AI 翻译

This article was translated from Chinese to English by AI. If there are any inaccuracies, please refer to the original Chinese version.


本文由 AI 辅助从中文翻译为英文。如遇不准确之处，请以中文原版为准。