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# Node-Srs
Bindings to libosr for handling spatial references in [node](http://nodejs.org).
## Example
Detect a proj4 literal string as spherical mercator:
```js
> var srs = require('srs');
> srs.parse('+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs')
{ proj4: '+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over',
srid: 3857,
auth: 'EPSG',
pretty_wkt: 'PROJCS["WGS 84 / Pseudo-Mercator",\n GEOGCS["WGS 84",\n DATUM["WGS_1984",\n SPHEROID["WGS 84",6378137,298.257223563,\n AUTHORITY["EPSG","7030"]],\n AUTHORITY["EPSG","6326"]],\n PRIMEM["Greenwich",0,\n AUTHORITY["EPSG","8901"]],\n UNIT["degree",0.0174532925199433,\n AUTHORITY["EPSG","9122"]],\n AUTHORITY["EPSG","4326"]],\n UNIT["metre",1,\n AUTHORITY["EPSG","9001"]],\n PROJECTION["Mercator_1SP"],\n PARAMETER["central_meridian",0],\n PARAMETER["scale_factor",1],\n PARAMETER["false_easting",0],\n PARAMETER["false_northing",0],\n EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs"],\n AUTHORITY["EPSG","3857"],\n AXIS["X",EAST],\n AXIS["Y",NORTH]]',
esri: false,
name: 'Google Maps Global Mercator',
valid: true,
is_geographic: false,
input: '+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs' }
```
Detect a WKT string as WGS84:
```js
> srs.parse('GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]')
{ input: 'GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]',
proj4: '+proj=longlat +ellps=WGS84 +no_defs',
srid: 4326,
auth: 'EPSG',
pretty_wkt: 'GEOGCS["GCS_WGS_1984",\n DATUM["D_WGS_1984",\n SPHEROID["WGS_1984",6378137,298.257223563]],\n PRIMEM["Greenwich",0],\n UNIT["Degree",0.017453292519943295],\n AUTHORITY["EPSG","4326"]]',
esri: false,
name: 'GCS_WGS_1984',
valid: true,
is_geographic: true }
```
## Depends
node >= 0.2.4 (development headers)
No other required dependencies
Optionally can depend/dynamically link to libgdal by doing:
./configure --shared-gdal
make
or:
export NODE_SRS_SHARED_GDAL=1
npm install srs
## Installation
Install node-srs:
From source:
$ git clone git://github.com/springmeyer/node-srs.git
$ cd node-srs
$ ./configure
$ make
$ sudo make install
$ make test
Make sure the node modules is on your path:
export NODE_PATH=/usr/local/lib/node/
Or you can install via npm:
$ npm install srs
## License
BSD, see LICENSE.txt
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