Maps Platform
Product updates, customer stories, and tips and tricks on Google Maps Platform
Maps made easier: GeoJSON in the JavaScript Maps API
dinsdag 18 maart 2014
Maps give us an easy way to visualize all types of information, from patterns in
health expenditure
across the world, to oceans with the highest concentration of
coral reefs at risk
. The tools used to create these maps should be just as easy to use. That’s why, starting today, the JavaScript Maps API will support GeoJSON, making it simpler for developers to visualize richer data, with even cleaner code.
GeoJSON
has emerged as a popular format for sharing location-based information on the web, and the JavaScript Maps API is embracing this open standard. This means, as a developer, you can now pull raw data from multiple data sources, such as the
US Geological Survey
or
Google Maps Engine
, and easily display it on your website.
How does it work? The new Data layer allows you to treat a dataset like… well, a set of data, rather than individual and unrelated features. If you have a GeoJSON file, you can now load it on the map simply by adding a single line of code to your JavaScript:
map.data.loadGeoJSON(‘earthquakes.json’);
Earthquakes over the past week loaded on the map
USGS All Earthquakes, Past Week
courtesy of the
U.S. Geological Survey
Tada! And what’s more, most places have attributes beyond just location: stores have opening times, rivers have current speed, and each
Girl Guide
troop has cookie selling turf. The Data layer allows you to represent
all attributes
in GeoJSON right on the map and make decisions about what data to display more easily.
You can use this information to create a styling function that says, “show the earthquakes as circles, scaled to their magnitude” and as the data or rules are updated, the styling will automatically be applied to every feature. This beats having to manually update each feature or rule as more information is added to the map.
Earthquakes over the past week, with a styling function applied
USGS All Earthquakes, Past Week
courtesy of the
U.S. Geological Survey
Earthquakes over the past week, with additional color and basemap styling applied
USGS All Earthquakes, Past Week
courtesy of the
U.S. Geological Survey
Get started by checking out our
developer docs
, the
code for these earthquake maps
, this
cool demo
showing data from different sources, and this
Google Developers Live video
. This is a new feature, so if you run into problems or think of any additions you’d love to see, get help on
StackOverflow
and check our
support page
for the right tags to use.
We’re looking forward to seeing what you build with this new tool and, as always, we’re eager for your feedback. Please comment on this post or on our
Google+ Page
.
Posted by
Jen Kovnats
, Product Manager on the Maps API Team
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