On 11/9/2014 3:46 PM, Pulkit Bhuwalka wrote:
1. Download bulk data from OSM using API (This is a small region)
2. Setup Postgres with PostGIS extension.
3. Import data into PostGIS database using osm2pgsql
I am not sure about the next step. What api should I use to query the
database? I suppose there exists some data access API which Mapnik and
other services use for drawing.
The database you have created is a PostgreSQL database, and there are
libraries in most languages for connecting to one.
Also, I don't quite understand the DB structure and the data encoding
within it. There are a few tables created by PostGIS (spatial_ref_sys
etc.) and a few tables created by OSM (planet_osm_*). I am unsure
about the relation between these tables.
The point, line, and polygon tables contain points, lines and polygons
respectively. The roads table contains a subset of data for low-zoom
rendering and is more complicated to use.
I recently also stumbled upon the Overpass API
<http://wiki.openstreetmap.org/wiki/Overpass_API> which seems to do
something similar. My requirements are actually pretty simple. I need
some simple querying to experiment with some rendering of my own.
You should look at the documentation for whatever rendering
library/server you want to use. It's also worth reading through the
documentation at
https://github.com/openstreetmap/osm2pgsql/tree/master/docs for more
information on osm2pgsql.
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