Publishing online with CartoDB
CartoDB is the name of an incredible stack of open source tools to make dynamic maps on the web.
CartoDB was developed by Vizzuality and they provide a CartoDB up and running that we can use for free (small maps).
To do these exercises, we will create a free account on CartoDB and use it to publish some maps on the web.
For this exercise we will use the hotel data created previously. You can download a copy from hotel.zip. It contains about 50 features digitized from the Wuhan tourist map. It is shapefile, in WGS84 geographical coordinates.
A map on the web with two mouse clicks
Go to CartoDB and create a free account. After login, you will have no data.
To start online mapping, just drag the hotel.zip file onto the browser. The data is immediately imported.
Just click on Map view.
You first map shows.
A map from an SQL query
We can use the SQL panel to create a map from a query.
SELECT * FROM hotel where wheelchair = 1