TileStache.Goodies.Providers.SolrGeoJSON module¶
Provider that returns GeoJSON data responses from Solr spatial queries.
This is an example of a provider that does not return an image, but rather queries a Solr instance for raw data and replies with a string of GeoJSON.
Read more about the GeoJSON spec at: http://geojson.org/geojson-spec.html
Caveats:
Example TileStache provider configuration:
- “solr”: {
- “provider”: {“class”: “TileStache.Goodies.Providers.SolrGeoJSON.Provider”,
- “kwargs”: {
- “solr_endpoint”: “http://localhost:8983/solr/example”, “solr_query”: “:”,
}}
}
The following optional parameters are also supported:
latitude_field: The name of the latitude field associated with your query parser; the default is ‘latitude’
longitude_field: The name of the longitude field associated with your query parser, default is ‘longitude
response_fields: A comma-separated list of fields with which to filter the Solr response; the default is ‘’ (or: include all fields)
id_field: The name name of your Solr instance’s unique ID field; the default is ‘’.
By default queries are scoped to the bounding box of a given tile. Radial queries are also supported if you supply a ‘radius’ kwarg to your provider and have installed the JTeam spatial plugin: http://www.jteam.nl/news/spatialsolr.html.
For example:
- “solr”: {
- “provider”: {“class”: “TileStache.Goodies.Providers.SolrGeoJSON.Provider”,
- “kwargs”: {
- “solr_endpoint”: “http://localhost:8983/solr/example”, “solr_query”: ‘foo:bar’, “radius”: “1”,
}}
}
Radial queries are begin at the center of the tile being rendered and distances are measured in kilometers.
The following optional parameters are also supported for radial queries:
query_parser: The name of the Solr query parser associated with your spatial plugin; the default is ‘spatial’.
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class
TileStache.Goodies.Providers.SolrGeoJSON.Provider(layer, solr_endpoint, solr_query, **kwargs)¶ -
getTypeByExtension(extension)¶ Get mime-type and format by file extension.
This only accepts “json”.
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renderTile(width, height, srs, coord)¶ Render a single tile, return a SaveableResponse instance.
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unproject(x, y)¶
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