and [MapQuest Open](http://developer.mapquest.com/web/products/open/map) provide satellite imagery.
and [MapQuest Open](http://developer.mapquest.com/web/products/open/map) provide satellite imagery among others.
#### I want to use Google Maps API tiles with Leaflet, can I do that?
@ -55,11 +56,13 @@ If you want to make tiles on your own, probably the easiest way is using [TileMi
#### I have an app that gets lots of hits a day, and I want to switch from Google/Bing/whatever to Leaflet. Is there a fee for using it?
Leaflet, unlike all-in-one solutions like Google Maps, is just a JavaScript library.
It's free to use, but doesn't provide map imagery on its own — you have to choose a tile service to combine with it.
Leaflet, unlike Google Maps and other all-in-one solutions, is just a JavaScript library.
It's free to use, but doesn't provide map imagery on its own —
you have to choose a tile service to combine with it.
There are plenty of options for a tile service, each with their own terms of use, prices (some of them free), features, limitations, etc.
See the answer to first question of the FAQ for more info.
There are [plenty of options](#what-map-tiles-can-i-use-with-leaflet-is-it-limited-to-openstreetmap) for a tile service,
each with their own terms of use, prices (some of them free), features, limitations, etc.
Choice is yours.
#### I'm building a commercial app that I plan to sell. Can I use Leaflet in it?
@ -75,10 +78,12 @@ Make sure you conform to the terms of use of a tile images provider that you cho
#### Why is there still no feature X in Leaflet?
First of all, did you check out the [plugins page](http://leafletjs.com/plugins.html)?
It has about hundred plugins doing all kinds of crazy stuff, and there's a high possibility that is has what you're looking for.
First of all, did you check out the [Leaflet plugins page](http://leafletjs.com/plugins.html)?
It lists about hundred plugins doing all kinds of crazy stuff,
and there's a high possibility that is has what you're looking for.
Generally, we do our best to keep the Leaflet core small, lightweight and simple, focusing on _quality_ instead of _quantity_, and leaving all the rest to plugin authors.
Generally, we do our best to keep the Leaflet core small, lightweight and simple,
focusing on _quality_ instead of _quantity_, and leaving all the rest to plugin authors.
Check out [this video](http://www.youtube.com/watch?v=_P2SaCPbJ4w) of a talk by the Leaflet creator for more background on the story and philosophy behind Leaflet.
Another essential read is [Advocating Simplicity in Open Source](http://blog.universalmind.com/advocating-simplicity-in-open-source/) by the same guy.
@ -92,12 +97,21 @@ Check out [Leaflet.markercluster](https://github.com/Leaflet/Leaflet.markerclust
#### I have vector data with many thousands of points on my map. Any performance tips?
Leaflet generally does a pretty good job of handling heavy vector data with its real-time clipping and simplification algorithms, but browser technology still has its limits.
Try [switching from SVG to Canvas as default rendering back-end](http://leafletjs.com/reference.html#global), it may help considerably (depends on the app and the data).
Leaflet generally does a pretty good job of handling heavy vector data
with its real-time clipping and simplification algorithms,
but browser technology still has its limits.
Try [switching from SVG to Canvas as default rendering back-end](http://leafletjs.com/reference.html#global),
it may help considerably (depends on the app and the data).
If you still have too much data to render, you'll have to use some help of a server-side service like [MapBox](https://www.mapbox.com/), [CartoDB](http://cartodb.com/) and [GIS Cloud](http://www.giscloud.com/) (they all work great with Leaflet).
What they do under the hood is serving rendered data as image tiles, along with additional data to enable interactivity like hovering shapes
(e.g. done using [UTFGrid](https://www.mapbox.com/developers/utfgrid/) — Leaflet [has a nice plugin](https://github.com/danzel/Leaflet.utfgrid) for it).
If you still have too much data to render, you'll have to use some help of a server-side service
like [MapBox](https://www.mapbox.com/),
[CartoDB](http://cartodb.com/)
and [GIS Cloud](http://www.giscloud.com/)
(they all work great with Leaflet).
What they do under the hood is serving rendered data as image tiles,
along with additional data to enable interactivity like hovering shapes
(e.g. done using [UTFGrid](https://www.mapbox.com/developers/utfgrid/) —
Leaflet [has a nice plugin](https://github.com/danzel/Leaflet.utfgrid) for it).
## Misc
@ -105,7 +119,8 @@ What they do under the hood is serving rendered data as image tiles, along with
#### I downloaded the Leaflet source but didn't find `leaflet.js` there. Why is that?
You can download the built versions using links from the [download page](http://leafletjs.com/download.html).
It even includes the latest build of the development version (`master` branch), updated automatically on each commit to the repo.
It even includes the latest build of the development version (`master` branch),
updated automatically on each commit to the repo.
We removed the built versions from the repository because it's a chore to build and commit them manually on each change,
and it often complicates merging branches and managing contributions.
Vladimir Agafonkin
11 years ago