A command line utility for generating consolidated [TopoJSON](https://github.com/mbostock/topojson/wiki/Command-Line-Reference) from various data sources. Used for making fast vector maps with D3.
* Repository: https://github.com/nprapps/mapturner
* Issues: https://github.com/nprapps/mapturner/issues
You will need to have the following non-Python dependencies installed:
* ogr2ogr (GDAL): `brew install ogr2ogr`
* firstname.lastname@example.org: (topojson 2+ does not work)
mapturner itself can be installed with pip:
pip install mapturner
Note: Since `mapturner` relies on topojson 1.x (old version of topojson), we recommend installing this version of topojson inside your project root folder by running:
npm install -g email@example.com --prefix node_modules
To install firstname.lastname@example.org globally instead run:
npm install -g email@example.com
`mapturner` will search first for the topojson binaries installed within the project and fallback to searching the topojson binary on your $PATH.
Developer install process:
git clone git://github.com/nprapps/mapturner.git
pip install -r requirements.txt
python setup.py develop
Define a YAML configuration file, such as the following example. The complete list of valid options is further on in this documentation.
bbox: '77.25 24.28 91.45 31.5'
where: adm0name = 'Nepal' AND scalerank < 8
Then run it!
mapturner input.yaml output.json
The following layer types are currently supported:
* ESRI Shapefile (`shp`)
* GeoJSON or TopoJSON (`json`)
* CSV (`csv`)
## How it works
For each layer defined in the configuration file:
* If path is a URL the file will be downloaded and cached locally. (It will not be redownloaded on subsequent runs.)
* If path is to a zipped file it will be unzipped.
* All layers will be clipped to the specified bounding box (using ogr2ogr).
* For each layer, if a `where` attribute is specified, the layer data will be filtered by that clause.
* For each layer, all fields in the layer *not* specified in the `properties` array will be removed (to reduce file size), unless `all-properties` is specified, in which case all will be kept.
* For each layer, if an `id-property` is set, data from that property will be set as the identifier for the features in the layer.
* The layer will be converted to [TopoJSON](https://github.com/mbostock/topojson/wiki/Command-Line-Reference).
After each layer has been processed all of them will be concatenated into a single TopoJSON file. Each layer's key name will be used to identify it in the output.
## Complete list of configuration options
For all layer types:
* `type`: The type of layer. Valid types are `shp`, `json` (GeoJSON or TopoJSON), and `csv`. **(Required)**
* `path`: The path (relative or absolute) to the layer data file. **(Required)**
* `id-property`: A property from the data file to use as the unique identifier for features. See also, [the TopoJSON command-line documentation](https://github.com/mbostock/topojson/wiki/Command-Line-Reference).
* `properties`: A list of properties from the data to be kept in the output. All other properties are dropped.
* `all-properties`: If true, then all properties are kept for this layer.
* `where`: A SQL-like query predicate that will filter the feature data. This This uses exactly the same query syntax as [ogr2ogr](http://www.gdal.org/ogr2ogr.html).
CSV layers only:
* `latitude`: The name of a column in the data containing the latitude of the point/feature.
* `longitude`: The name of a column in the data containing the longitude of the point/feature.
## Cached data
Cached shapefiles are stored in `~/.mapturner`. You may wish to clear this folder periodically to free up space and ensure updated shapefiles are redownloaded.
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.