mapnik

node-mapnik

Bindings to Mapnik for node.

Usage

Render a map from a stylesheet:

var mapnik = require('mapnik');
var fs = require('fs');

// register fonts and datasource plugins
mapnik.register_default_fonts();
mapnik.register_default_input_plugins();

var map = new mapnik.Map(256, 256);
map.load('./test/stylesheet.xml', function(err,map) {
    if (err) throw err;
    map.zoomAll();
    var im = new mapnik.Image(256, 256);
    map.render(im, function(err,im) {
      if (err) throw err;
      im.encode('png', function(err,buffer) {
          if (err) throw err;
          fs.writeFile('map.png',buffer, function(err) {
              if (err) throw err;
              console.log('saved map image to map.png');
          });
      });
    });
});

Convert a jpeg image to a png:

var mapnik = require('mapnik');
new mapnik.Image.open('input.jpg').save('output.png');

Convert a shapefile to GeoJSON:

var mapnik = require('mapnik');
mapnik.register_datasource(path.join(mapnik.settings.paths.input_plugins,'shape.input'));
var ds = new mapnik.Datasource({type:'shape',file:'test/data/world_merc.shp'});
var featureset = ds.featureset()
var geojson = {
  "type": "FeatureCollection",
  "features": [
  ]
}
var feat = featureset.next();
while (feat) {
    geojson.features.push(JSON.parse(feat.toJSON()));
    feat = featureset.next();
}
fs.writeFileSync("output.geojson",JSON.stringify(geojson,null,2));

For more sample code see the tests and sample code.

Depends

OS	Node.js	C++ minimum requirements	OS versions
Mac	v0.10.x, v4, v5, v6	C++11	Mac OS X > 10.10
Linux	v0.10.x, v4, v5, v6	C++11	Ubuntu Linux > 16.04 or other Linux distributions with g++ >= 5 toolchain (>= GLIBCXX_3.4.21 from libstdc++)
Windows	v0.10.x, v4, v5	C++11	See the Windows requirements section

An installation error like below indicates your system does not have a modern enough libstdc++/gcc-base toolchain:

Error: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version GLIBCXX_3.4.21 not found (required by /node_modules/osrm/lib/binding/osrm.node)

If you are running Ubuntu older than 16.04 you can easily upgrade your libstdc++ version like:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update -y
sudo apt-get install -y libstdc++-5-dev

To upgrade libstdc++ on travis (without sudo) you can do:

language: cpp

sudo: false

addons:
  apt:
    sources:
     - ubuntu-toolchain-r-test
    packages:
     - libstdc++-5-dev # upgrade libstdc++ on linux to support C++11

Installing

Just do:

npm install

Note: This will install the latest node-mapnik 3.x series, which is recommended. There is also an 1.x series which maintains API compatibility with Mapnik 2.3.x and 2.2.x and a v0.7.x series which is not recommended unless you need to support Mapnik 2.1 or older.

By default, binaries are provided for:

• 64 bit OS X 10.9, 64 bit Linux (>= Ubuntu Trusty), and 64/32 bit Windows
• several node versions:
  • versions forLinux/Mac
  • versions for Windows

On those platforms no external dependencies are needed.

Other platforms will fall back to a source compile: see Source Build for details.

Binaries started being provided at node-mapnik >= 1.4.2 for OSX and Linux and at 1.4.8 for Windows.

Windows specific

NOTE: Windows binaries for the 3.x series require the Visual C++ Redistributable Packages for Visual Studio 2015:

• https://mapbox.s3.amazonaws.com/windows-builds/visual-studio-runtimes/vcredist-VS2015/vcredist_x64.exe
• https://mapbox.s3.amazonaws.com/windows-builds/visual-studio-runtimes/vcredist-VS2015/vcredist_x86.exe

See https://github.com/mapnik/node-mapnik/wiki/WindowsBinaries for more details.

The 1.x series require the Visual C++ Redistributable Packages for Visual Studio 2013:

• http://www.microsoft.com/en-us/download/details.aspx?id=40784

Source Build

To build from source you need:

• Mapnik >= v3.0.10

Install Mapnik using the instructions at: https://github.com/mapnik/mapnik/wiki/Mapnik-Installation

Confirm that the mapnik-config program is available and on your ${PATH}.

Then run (within the cloned node-mapnik directory:

npm install --build-from-source

Windows specific

Windows builds are maintained in https://github.com/mapbox/windows-builds

Using node-mapnik from your node app

To require node-mapnik as a dependency of another package put in your package.json:

"dependencies"  : { "mapnik":"*" } // replace * with a given semver version string

Tests

To run the tests do:

npm test

License

BSD, see LICENSE.txt

Changelog

3.6.1

Updated for a fix associated with mapnik-vector-tile where images could be requested that would have a width or height of zero resulting in exceptions.

Several fixes associated with different mapnik by updating to use 3.0.14. Please see mapnik change log for specifics. In general note worthy changes from mapnik include stricter geojson parsing, fixes for raster plugin, fixes to image scaling, changing the meaning of filter-factor, and improvements to the the TIFF decoder.

Due to changes in the mapnik core version during this update you should see some changes in the image rescaling of raster and gdal plugin source data. This will definitely change the expected output. This is due to fixes in long standing bugs in the mapnik library.

• Now supporting node v8
• Updated to mapnik-vector-tile@1.4.0
• Mapnik minimum version updated to 3.0.14. Does not work with mapnik 3.1.x currently.
• Fixed tests around zlib compression and decompression when comparing to node's implementation
• Fixes rare situation of seg faults during mapnik-vector-tile image processing.
• Corrects the resolution of images in mapnik-vector-tile when using parameters from postgis plugin.
• Updated to use font_engine instance() method explicitely, reflecting on changes brought by 3688