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Geospatial processing for OpenRefine

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GeoRefine
=========

GeoRefine is a geospatial processing extension for [OpenRefine](http://openrefine.org/).

GREL functions
--------------

* `point`: creates a point from latitude and longitude in the WGS84 coordinate reference system
 * `distance`: computes the distance between two points in meters
 * `parseGeoJson`: parses [GeoJSON](http://geojson.org/) string
 * `parseWkt`: parses [WKT](http://en.wikipedia.org/wiki/Well-known_text) string
 * [All geometry relationship functions described here](http://docs.geotools.org/stable/userguide/library/jts/relate.html):
    * `equals`
    * `contains`
    * `within`
    * `overlaps`
    * `crosses`
    * `touches`
    * `intersects`
    * `disjoint`
    * `relate`

Installation
------------

[Download GeoRefine](https://github.com/ryanfb/georefine/archive/master.zip) and place the unzipped folder in the `extensions` directory of your OpenRefine workspace.

On OS X, this will be `/Applications/Google Refine.app/Contents/Resources/webapp/extensions`.

Examples
--------

Using GREL to facet places based on whether they're contained by [the Barrington Atlas capgrid for Byzantium](http://atlantides.org/capgrids/52):

contains(parseGeoJson("{\"type\": \"Polygon\", \"coordinates\": [[[31.0, 40.0], [31.0, 42.0], [27.0, 42.0], [27.0, 40.0], [31.0, 40.0]]]}"),parseGeoJson(value))

Feature Wishlist
----------------

* parsing geospatial information from and to GeoJSON/WKT
 * spatial operations in GREL: distance, area, contains, overlaps, touches, equals, crosses, disjoint, within
 * spatial faceting on spatial operations
 * spatial clustering
 * simple spatial visualization

Compiling
---------

Unlike most OpenRefine extensions, GeoRefine uses maven instead of ant, due to the need for complicated [GeoTools](http://www.geotools.org/) dependencies. Run `mvn compile` to compile Java source to classes. If you update dependencies, run `mvn dependency:copy-dependencies` to install them into `target`. You'll then need to manually move them into `module/MOD-INF/lib`, taking care to remove conflicting jars already provided by OpenRefine such as `openrefine-1.0.jar` and `json-20100208.jar`. GeoRefine is expected to be built in the `extensions` directory of an OpenRefine source tree, with the OpenRefine system jar built in that tree with the `ant jar` task.

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