document defs

//the floating points to answer your question

```

## Named Projections

If you prefer to define a projection as a string and refence it that way, you may use the proj4.defs method which can be called 2 ways, with a name and projection:

```js

proj4.defs('WGS84', "+title=WGS 84 (long/lat) +proj=longlat +ellps=WGS84 +datum=WGS84 +units=degrees");

```

or with an array

```js

proj4.defs([

  [

    'EPSG:4326',

    '+title=WGS 84 (long/lat) +proj=longlat +ellps=WGS84 +datum=WGS84 +units=degrees'],

  [

    'EPSG:4269',

    '+title=NAD83 (long/lat) +proj=longlat +a=6378137.0 +b=6356752.31414036 +ellps=GRS80 +datum=NAD83 +units=degrees'

  ]

]);

```

you can then do 

```js

proj4('EPSG:4326');

```

instead of writing out the whole proj definition, by default proj4 has the following projections predefined:

- 'WGS84'

- 'EPSG:4326'

- 'EPSG:4269'

- 'EPSG:3857', which has the following aliases

    - 'EPSG:3785'

    - 'GOOGLE'

    - 'EPSG:900913'

    - 'EPSG:102113'

defined projections can also be accessed as properties of the proj4.defs function (`proj4.defs['EPSG:4326']`).

##Developing

to set up build tools make sure you have node and grunt-cli installed and then run `npm install`