Plot AQI data from AirNow, similar to the plotquakes.js example

plotaqi.js

#pragma strict

// Script to visualize AQI data in JSON format from airnowapi.org
// Requires the SimpleJSON plugin from http://wiki.unity3d.com/index.php/SimpleJSON
// The script should be attached to a model of the Earth such as a sphere
// scaled by a factor of 20 and positioned at (0,0,0).  A prefab to use for marking
// the readings should be assigned to the variable "prefab" in the Unity editor.

import SimpleJSON;

var prefab : GameObject;

function Start ()
    {
    var colormap = [ Color.white, Color.green, Color.yellow, Color(1.0,0.5,0.0), Color.red, Color(0.7,0,0.3) ];
    var datastring = System.IO.File.ReadAllText("Assets/data/aqi.json");
    var data = JSON.Parse(datastring);
    var i : int;
    var lat : float;
    var lon : float;
    var aqi : float;
    var cat : int;
    var radius = 10.0;
    for (i=0; i < data.AsArray.Count; i++)
        {
        lon = data[i]["Longitude"].AsFloat;
        lat = data[i]["Latitude"].AsFloat;
        aqi = data[i]["AQI"].AsFloat;
        cat = data[i]["Category"].AsInt;
        lon = lon * Mathf.Deg2Rad;
        lat = lat * Mathf.Deg2Rad;
        var pos = new Vector3(Mathf.Cos(lon)*Mathf.Cos(lat)*radius, Mathf.Sin(lat)*radius, Mathf.Sin(lon)*Mathf.Cos(lat)*radius);
        var marker = Instantiate(prefab, pos, Quaternion.identity);
        marker.GetComponent.<Renderer>().material.color = colormap[cat];
        marker.transform.parent = transform;
        }
    }