How to remove data from a Google Maps Data Layer?

Question

I see Google Maps support geojson. Looking at the docs here: https://developers.google.com/maps/documentation/javascript/datalayer#load_geojson

Given the last exampl

Answer 1

As a follow-up to @mensi's answer, it can be important to keep track of different sets of features loaded from different data sources. You could do that by adding a property to each feature:

feature.setProperty('kind', 'region');
feature.setProperty('kind', 'lake');

However, it may be easier to create multiple data layers. A Google Map by default starts out with a single data layer, but you are not limited to that. You can do:

var datalayer = new google.maps.Data({ map: mymap });

(It's important to set a map option, or your data layer will not show up.)

This way, it's easier to group features by layer, and turn entire layers on or off.