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|
===============
osm@spline Xapi
===============
Aim
============
We like to rewrite some parts of the XApi needed for our own application. Our
aim is not get a full implementation of the Xapi, but to answer only specific
requests, at low latency. For this subset of Xapi we want completly cover the
original api.
Requests
=============
This is a list of example requests, we want to optimize.
* xapi.spline.de/api/0.6/node[amenity=*]
* xapi.spline.de/api/0.6/node[highway=busstop]
* xapi.spline.de/api/0.6/node[bbox=-6,50,2,61]
* xapi.spline.de/api/0.6/node[amenity=hospital][bbox=-6,50,2,61]
a more formal description
-------------------------
We serve the node endpoint, but no others. We implment the tag based filtering,
for only one tag and a bounding box.
database shema
================
We keep data in a highly specioaliced shema, that allows us to prevent tables
growing to big. And supports our requests at maximum speed.
| CREATE TABLE <tagname>:<tagvalue> (
| {bigint id}
| {longitude float4},
| {latitude float4},
| {object varchar}
| ) PRIMARY KEY id;
Implmentation
=============
Teilprobleme:
..............
1. Database import
mögliche Technologien:
* Osmosis- plugin
* selbst in python (Protobuf consumer, async pgsql schreiber)
2. Web API
..............
mögliche Technologien:
* node.js
|
