shp-write-mm

Working version for larger files using WGS84 projection. -mm


Writes shapefile in pure javascript. Uses dbf
for the data component, and jsZIP to generate
ZIP file downloads in-browser.

Usage

For node.js or browserify

npm install --save shp-write

Or in a browser

https://unpkg.com/shp-write@latest/shpwrite.js

Testing

To test the download functionality run npm run make-test and open index.html in browser.
This should start an immediate download of test features defined in indexTest.js.

Caveats

* Requires a capable fancy modern browser with Typed Arrays
support
* Geometries: Point, LineString, Polygon, MultiLineString, MultiPolygon
* Tabular-style properties export with Shapefile's field name length limit

Example

``js
var shpwrite = require('shp-write');

// (optional) set names for zip file, zipped folder and feature types
var options = {
folder: 'myshapes',
types: {
point: 'mypoints',
polygon: 'mypolygons',
polyline: 'mylines'
}
}
// a GeoJSON bridge for features
shpwrite.download({
type: 'FeatureCollection',
features: [
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [0, 0]
},
properties: {
name: 'Foo'
}
},
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [0, 10]
},
properties: {
name: 'Bar'
}
}
]
}, options);
// triggers a download of a zip file with shapefiles contained within.
`

API

$3

Given a GeoJSON FeatureCollection as an object,
converts convertible features into Shapefiles and triggers a download.

$3

Given data, an array of objects for each row of data, geometry, the OGC standard
geometry type (like POINT), geometries, a list of geometries as bare coordinate
arrays, generate a shapfile and call the callback with err and an object with

`js
{
shp: DataView(),
shx: DataView(),
dbf: DataView()
}
``

$3

Generate a ArrayBuffer of a zipped shapefile, dbf, and prj, from a GeoJSON
object.

Other Implementations

* https://code.google.com/p/pyshp/

Reference

* http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf

Contributors

* Nick Baugh

Pull requests contained in this branch

This branch includes the following PRs of the official repository:

* IE download fix (merged manually as the source repo is gone)
* Fix point export
* Fixed extraction of polygon coordinates