title: how to change mongodb string to geoJSON point throughout the collection
body: <p>I have a Mongodb collection parking_info and this is one document in the collection:</p>
  
  <pre><code>{
  "_id" : ObjectId("559c152fa439a961c357f931"),
  "POST_ID" : "354-20160",
  "MS_ID" : "-",
  "MS_SPACEID" : 0,
  "CAP_COLOR" : "Grey",
  "METER_TYPE" : "SS",
  "SMART_METE" : "Y",
  "ACTIVESENS" : "N",
  "JURISDICTI" : "SFMTA",
  "ON_OFF_STR" : "ON",
  "OSP_ID" : 0,
  "STREET_NUM" : 2016,
  "STREETNAME" : "CHESTNUT ST",
  "STREET_SEG" : 3.977e+006,
  "RATEAREA" : "Area 5",
  "SFPARKAREA" : "Marina",
  "LOCATION" : "(37.8007983983, -122.4368696024)"
  </code></pre>
  
  <p>}</p>
  
  <p>I need to convert the last field <code>"LOCATION" : "(37.8007983983, -122.4368696024)"</code> 
  here the order is latitude , then longitude.
  to</p>
  
  <p><code>"LOCATION" : { type: "Point", coordinates: [ -122.4368696024, 37.8007983983]},</code>
  The coordinate order is longitude, then latitude.</p>
  
  <p>How can I apply that to all documents in the collection? </p>