This project was made in request to my mother, who works at the hospital. The problem was, each time they receive a patient, they will need to know if the patient is within their boundary, before accepting them. However, manually, this would take a lot of time as there are a lot of postal codes defining the boundary. So, she suggested I make a web app to make things easier.

Using the OneMap API provided by the Singapore Government, I converted each of the 45000 postal codes to latitude and longitude. I then used AlphaShape to find the concave hull of the points. I used an alpha value of 200 to achieve the optimal results.

I then used a ray casting algorithm to determine if the given postal code was in the boundary. I used Leaflet to display the results on a map, and to give a more user-friendly experience.