npm install shapefile-stream``bash`
$ npm install shapefile-stream
Note: you will need node and npm installed first.
The easiest way to install node.js is with nave.sh by executing [sudo] ./nave.sh usemain stable
You can extract the shapefile data from a file stream:
`javascript
var shapefile = require('shapefile-stream');
// both the .shp and the .dbf files are required
shapefile.createReadStream( 'example.shp' )
.pipe( shapefile.stringify )
.pipe( process.stdout );
`
The easiest way to get started writing your own pipes is to use through2; just make sure you call next().
`javascript
var shapefile = require('shapefile-stream'),
through = require('through2');
shapefile.createReadStream( 'example.shp' )
.pipe( through.obj( function( data, enc, next ){
console.log(
data.type,
data.properties.qs_adm0,
data.properties.qs_a1,
data.geometry.type,
data.geometry.coordinates[0].length
);
next();
}));
`
`bash`
Feature France MARNE Polygon 184
Feature France MEURTHE-ET-MOSELLE MultiPolygon 1
Feature France NIEVRE Polygon 162
Feature France NORD Polygon 167
Each shapefile is different, but the example file outputs objects which look like this:
`javascript`
{
"type": "Feature",
"properties": {
"qs_adm0_a3": "FRA",
"qs_adm0": "France",
"qs_level": "adm2_region",
"qs_iso_cc": "FR",
"qs_a0": "France",
"qs_a0_lc": null,
"qs_a1r": "ALSACE",
"qs_a1r_alt": null,
"qs_a1r_lc": "42",
"qs_a1": "BAS-RHIN",
"qs_a1_alt": null,
"qs_a1_lc": "67",
"qs_a2r": "STRASBOURG",
"qs_a2r_alt": null,
"qs_a2r_lc": "6",
"qs_type": "Arrondissement",
"qs_source": "France IGN",
"qs_pop": null,
"qs_id": null,
"qs_gn_id": null,
"qs_woe_id": null,
"qs_scale": null
},
"geometry": {
"type": "Polygon",
"coordinates": [<
}
}
The shapefile-stream npm module can be found here:
https://npmjs.org/package/shapefile-stream
Please fork and pull request against upstream master on a feature branch.
Pretty please; provide unit tests and script fixtures in the test directory.
`bash`
$ npm test
Travis tests every release against node version 0.10`
