Now that I'm finally able to render simple maps with GeoTools, I would like to
start rendering OSM data.
I have loaded a subset of the OSM data into a PostgreSQL database using
osmosis. For a variety of reasons, I do not want to use osm2pgsql.
>From a "traditional" GIS perspective, the osmosis schema is a little unusual.
>First off, there no points, lines, and polygons per se. Instead there are
>nodes, ways, and relationships.
Also, osmosis uses hstore to store osm tags (attribute information for nodes,
ways, etc).
I want to be able to select features like roads or points of interest and
generate a map. For example:
(1) Query the osm database to find all places of worship:
SELECT *
FROM nodes
WHERE tags->'amenity'= 'place_of_worship' AND tags->'religion'= 'christian'
(2) Grab results and generate a map.
Rendering nodes is relatively simple. Getting lines and polygons are a little
trickier.
Before I reinvent the wheel, does anyone have a working example that they would
like to share? I don't need a fancy data store like the ShapefileDataStore. I
just need something that can serialize entries in the nodes, ways, and
relations table into JTS geometries line com.vividsolutions.jts.geom.Polygon,
com.vividsolutions.jts.geom.LineString, etc.
Thanks,Peter
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