Finding elevations can be more difficult than it needs to be. This project allows a user to click on a location and view its longitude, latitude, and elevation from a map produced inside the browser. The elevation measurements are accurate to 10 meters. Since Hong Kong is a unique city with varying elevations, so your map will start there, but you can feel free to move anywhere you like!
The webpage was completed as part of the Mapbox "Find elevations with the Tilequery API," which you can find here.