Google Maps - Get Polygon border of zones/neighborhood

google-maps

Solution

I got it by using WikiMapia data.

The steps are:

- Open WikiMapia.

- Press `F12` or `Ctrl+Shift+I`.

- Search the location that you want.

- Click with the right button on neighborhood and choose `Edit Poly`.

- On the developer tools click in `Network` and filter by `getPolygon`.

Copy server response that looks like:

And go to `Console` tab to execute the function: `Wikimapia.Parser.Itiles.prototype.decodePolygon("Copyed text here");`

- Press enter to execute after this the Console will return the object with the points (The path of Poly).

I use `JSON.stringify` to transform the object in JSON.

Example:

JSON.stringify(Wikimapia.Parser.Itiles.prototype.decodePolygon("-619402099;-109032887;02fe8953fffe5a000ae5fe379a000fedffd250000e40ffd6050007f7ffeff2001925ffd59b001f6fffdc310012dcffed10003b82ffd9b9005514ffc4520053d2ffc807000c92fff82dfffde7000e670005070012ef0009390021bf000572001358fffc3a001a57fffa210013c1ffff940036530008610022fc000284004732fff5f0001fb1fff2960013c1fff80800594efffde7002c72000f16004b5000204600416f0013b2002292"))

The code above will return this JSON (indentation in JsonFormatter):

{
   "points":[
      {
         "lat":-10.9032887,
         "lng":-61.9402099
      },
      {
         "lat":-10.9032466,
         "lng":-61.9306183
      },
      {
         "lat":-10.8915629,
         "lng":-61.9308972
      },
      {
         "lat":-10.8903934,
         "lng":-61.9313049
      },
      {
         "lat":-10.8893188,
         "lng":-61.9316697
      },
      {
         "lat":-10.8889079,
         "lng":-61.9318736
      },
      {
         "lat":-10.8878227,
         "lng":-61.9325173
      },
      {
         "lat":-10.8869061,
         "lng":-61.933322
      },
      {
         "lat":-10.8864214,
         "lng":-61.9338048
      },
      {
         "lat":-10.8854416,
         "lng":-61.9353282
      },
      {
         "lat":-10.8839139,
         "lng":-61.9375062
      },
      {
         "lat":-10.8824811,
         "lng":-61.939652
      },
      {
         "lat":-10.8822809,
         "lng":-61.9399738
      },
      {
         "lat":-10.8826496,
         "lng":-61.9399202
      },
      {
         "lat":-10.8831343,
         "lng":-61.9400489
      },
      {
         "lat":-10.8839982,
         "lng":-61.940285
      },
      {
         "lat":-10.8844934,
         "lng":-61.9404244
      },
      {
         "lat":-10.8851677,
         "lng":-61.9403279
      },
      {
         "lat":-10.8856734,
         "lng":-61.9401777
      },
      {
         "lat":-10.8870641,
         "lng":-61.940167
      },
      {
         "lat":-10.8879597,
         "lng":-61.9403815
      },
      {
         "lat":-10.8897823,
         "lng":-61.9404459
      },
      {
         "lat":-10.8905936,
         "lng":-61.9401884
      },
      {
         "lat":-10.8910993,
         "lng":-61.9398451
      },
      {
         "lat":-10.8933855,
         "lng":-61.9396412
      },
      {
         "lat":-10.8945233,
         "lng":-61.9395876
      },
      {
         "lat":-10.8964513,
         "lng":-61.9399738
      },
      {
         "lat":-10.8981264,
         "lng":-61.9408
      },
      {
         "lat":-10.8990114,
         "lng":-61.9413042
      }
   ],
   "bounds":{
      "left":-61.9413042,
      "bottom":-10.9032887,
      "right":-61.9306183,
      "top":-10.8822809,
      "centerLatLng":null
   }
}

Finally I use regex like this regexr.com/3c5m2 to turn JSON into WKT. I don't copy entire JSON only the objects in `"points"` array in Regex. On RegExr I copy the replaced text and paste in `POLYGON((pastehere))`.

Important! After apply the regex you need to repeat the first point in last point.

-61.956523060798645 -10.877613428213532,-61.95640504360199 -10.877718788854143,-61.956791281700134 -10.878393096072424,-61.95735991001129 -10.87805594265392,-61.95682346820831 -10.877339490373695,-61.956523060798645 -10.877613428213532

Then you get something like this:

POLYGON((-61.956523060798645 -10.877613428213532,-61.95640504360199 -10.877718788854143,-61.956791281700134 -10.878393096072424,-61.95735991001129 -10.87805594265392,-61.95682346820831 -10.877339490373695,-61.956523060798645 -10.877613428213532))

That can be inserted in database that supports WKT (like MySQL).

WikiMapia has an API then all of this process can be automatic, but this works fine for me.

Problem

Original source