Scrape Polygons from CartoDB Google Maps

This google map [login to view URL] is displaying a large amount of polygons. Viewing the source you can see they are using a service called CartoDB. Zooming in on the map you will see that there are alot of polygons. If the map were using a standard GeoJSON file as in the demo [login to view URL] then my guess is that GeoJSON file would be much too large for a user to load each time they look at the map. This is probably why they are using CartoDB. I have a fealing that CartoDB has converted the GeoJSON/Polygon data into images that are overlayed on the google map, which is probably much quicker.

Markers/Pins are not required to be extracted as I believe this would increase load time on the final map.

A. Find out how CartoDB is storing and displaying the polygons. Is it GeoJSON or are they Image files overlayed on top of Google Maps.

B. Extract the colored polygons in the same format as used by CartoDB to local storage.

C. Display the polygons on a Google Map.

D. B&C needs to be scripted to extract data from the Original Map [login to view URL] so I can setup a daily CRON job to keep my map updated with the original.


Original Map [login to view URL]

Copied Map [login to view URL]

Basic Version of Copied Map [login to view URL]

So after I discovered CartoDB is displaying polygons as PNG files, I am assuming it is much too difficult to scrape these PNG files and stitch them back together for reuse?

The original map I would like to to use on my site is

Apart from the polygon data on the original map I would like to add my own markers and data (future project once this one is complete). So an iframe would not work.

Another website has succesfully hotlinked the CartoDB database from the original site and have also managed to add their own data. See


A. How is this duplicate site able to use the data from CartoDB?

B. How are updates on the original site handled on the duplicate site ? For example if the main sites CartoDB /viz.json files URL was to change, how can a duplicate site automatically change as well?

C. Is it possible to not load the markers? Would not loading the markers result in better performance?

Project Outcomes:

A google map which shows the colored polygons without markers and is able to automatically update when the original site is updated using a script triggered by a daily CRON job. All code must be original and not copied from the duplicate site

Skills: Google Maps API, Javascript, PHP, Python, Web Scraping

See more: basic polygon, google maps extract image save image, scrape files site, can save image google maps, saving screen image google maps, extracting vector image google maps, saving image google maps, php scrape largest image website, php capture image google maps, save map image google maps, save image google maps

About the Employer:
( 60 reviews ) Melbourne, Australia

Project ID: #10158068

2 freelancers are bidding on average $250 for this job


This project is a piece-of-cake for me :) I can finish it in a day. Please let me know if you would like to hire me.

$250 AUD in 3 days
(151 Reviews)

Hello Degitizing map into shp files for future use. If you need any vector map format, I can convert according to your needs. The proposing resolution of digitizing ( related pecision of map) 1:25000. I'm sure t More

$250 AUD in 10 days
(6 Reviews)