OpenStreetMap
I recently released the first version of a mostly-complete Java implementation of the XAPI server. The source code is available on my GitHub with a readme describing generally how to get it set up.
Running this database with a full-planet requires some large, fast disks. The database is roughly 350GB and is slowly increasing:
CPU and memory usage are useful for the initial import (indexing especially), but any subsequent queries will be limited by the disk speed.
Feel free to use it! Serge W. created an XAPI UI framework that I set up at http://openstreetmap.us/uixapi/xapi.html to build the XAPI query URLs.
At the moment, the Java XAPI seems to have a problem returning relations and doesn't implement child element predicates or special tags. If you find other problems, please file a bug.
討論
由Firefishy於2011年1月26日15:13發表的評論
Stats for xapi.osm.org for 25 Jan 2011:
tags:
@user= - 27 queries from 12 IP addresses.
@uid= - 3 queries from 2 IP address.
@changeset - 1 query
由Harry Wood於2011年1月26日16:00發表的評論
You didn't actually mention the base URL for your new service: http://openstreetmap.us/xapi/api/0.6/
It works! Example: All the libraries in London : http://openstreetmap.us/xapi/api/0.6/*[amenity=library][bbox=-0.57,51.24,0.31,51.75]
Great work!
由Tom Chance於2011年1月26日16:24發表的評論
Great, I'll give it a go.
由Maarten Deen於2011年1月26日16:37發表的評論
Looks promising. But the performance with large bboxes isn't there yet.
Harry Wood's example works for me, I can also download banks in a 0.2x0.2 bbox, but trying to get banks for the whole of the Netherlands does not work yet. I get a "504 Gateway Time-out" message.
My test URL: http://openstreetmap.us/xapi/api/0.6/*[amenity=bank][bbox=2.5,50.7,7.2,53.6]
由iandees於2011年1月26日16:42發表的評論
The machine restarted itself at 16:00UTC or so, which lines itself up with your request fairly well.
But yes, large bounding box queries are mildly slow -- I don't remember them being particularly fast on the other system, though.
由Tom Chance於2011年1月26日16:48發表的評論
I get the same message trying to download all power generators in the UK.
http://openstreetmap.us/xapi/api/0.6/*[power=generator][-6.5,49.68,2.67,61.31]
Just London works fine:
http://openstreetmap.us/xapi/api/0.6/*[power=generator][bbox=-0.5
1,51.20,0.35,51.80]
由iandees於2011年1月26日16:53發表的評論
It bounced a few more times and is down hard now. There appear to be some ECC memory errors, but I put fresh memory in a while back. Looks to be a bad motherboard. Thanks for the stress test, everyone!
由Geonick於2011年1月27日23:13發表的評論
Is this XAPI UI really reflect the syntax of XAPI? Currently there is only one tag predicate. Isn't it possible to query more than one, like
http://openstreetmap.us/xapi/api/0.6/*[amenity=parking][capacity:disabled=*][bbox=-0.57,51.24,0.31,51.75]
Actually, even the OSM wiki leaves this question open:
osm.wiki/Xapi#Predicates
It would be nice anyhow that the wiki page get's enhanced with a real syntax definition.
由iandees於2011年1月28日01:24發表的評論
@Geonick: yes, this really does follow the XAPI query syntax. You can indeed supply multiple tag predicates. It will eventually be possible to include multiple bounding box predicates, but at the moment I only allow one.
由Katzman於2011年3月9日21:01發表的評論
Two things:
- so the possibility to enter multiple tags is not implemented yet, right?
- is it possible to do non-case sensitive search on the values, such as icao=lklt would return any combination of LKLT, lklt, LKlt, LkLt, etc.?
Thanks!
由iandees於2011年3月9日21:03發表的評論
@Katzman:
1. It is possible to enter multiple tag predicates:
[amenity=foo|bar] := "amenity"="foo" OR "amenity"="bar"
[amenity|leisure=foo] := "amenity"="foo" OR "leisure"="foo"
[amenity=foo][area=bar] := "amenity"="foo" AND "area"="bar"
2. Not at this time.
由Arminus於2011年3月21日19:34發表的評論
Very nice ! Any updates on the relation problem ?
由Tilo於2011年3月31日17:45發表的評論
Is the jxapi down at the moment?
I want to prevent denied download requests before the request is sent. How is it handled, if a bbox is too large? like this?
[bbox=West,South,East,North]
if difference(West,East)*difference(South,North) > 10 --> denied
if difference(West,East)*difference(South,North) <= 10 --> accepted
Is it planned to allow larger bboxes than 10 sqaredegrees in future?
Thanks!
由Tilo於2011年3月31日17:48發表的評論
[bbox=West,South,East,North]
if difference(West,East)*difference(South,North) > 10 --- denied
if difference(West,East)*difference(South,North) <= 10 --- accepted
由iandees於2011年3月31日17:51發表的評論
@Tilo: No, the jxapi is/was not down. It was getting inundated with duplicate requests so the process queue was very long. I restarted postgres to clean out the queue.
I compute the sum of the areas of the requested bounding box(es) and compare that to 10. If larger, 500. If less, let it through.
There are no plans to do areas larger than 10 square degrees. As you can see already the hardware has a hard enough time keeping up.
由Tilo於2011年3月31日17:51發表的評論
damn,
the third line was supposed to look like this (now, in words):
if difference(West,East)*difference(South,North) is less or equal 10 then accepted
由Tilo於2011年3月31日17:59發表的評論
Great! thanks a lot.
由Tilo於2011年4月1日04:36發表的評論
I just tested a little smaller request than 10 square degrees with the request below (9.8 sqdeg) and ran into an Error. see the message below from http://jxapi.openstreetmap.org/xapi/admin/stats
ERROR way[boundary=administrative][bbox=8,48,10,52.9] 144 30 mins 32.909 secs
What is wrong with the request? Is there another reason for denial than the bounding box?
Thanks
由Tilo於2011年4月1日05:12發表的評論
this worked:
way[boundary=administrative][bbox=8,48,10,52] (221655 elements)
but this didn't:
way[bbox=8,48,10,52]
???
由malcolmh於2011年4月5日09:44發表的評論
Bounding boxes that straddle 180 E/W are rejected. I assume this is because West > East. Is this a bug or a feature?
由iandees於2011年4月5日10:47發表的評論
This is not a good place to make bug reports. Do that here: https://github.com/iandees/xapi-servlet/issues
由Langlaeufer於2011年4月12日19:27發表的評論
Examples for Bugs with relations.
JXAPI !causes a browser crash!: http://jxapi.openstreetmap.org/xapi/api/0.6/relation%5Bbbox=9.6,52.4,9.7,52.5%5D%5Btype=restriction%5D
or delivers noting: http://jxapi.openstreetmap.org/xapi/api/0.6/*%5Bbbox=9.6,52.4,9.7,52.5%5D%5Btype=restriction%5D
XAPI Request: http://xapi.openstreetmap.org/api/0.6/relation%5Bbbox=9.6,52.4,9.7,52.5%5D%5Btype=restriction%5D
also in this way: http://xapi.openstreetmap.org/api/0.6/*%5Bbbox=9.6,52.4,9.7,52.5%5D%5Btype=restriction%5D
由iandees於2011年4月12日20:05發表的評論
********THIS IS NOT A GOOD PLACE TO MAKE BUG REPORTS************. Do that here: https://github.com/iandees/xapi-servlet/issues
由Langlaeufer於2011年4月17日12:36發表的評論
sorry, I do not like to register there!
由Bryce C Nesbitt於2011年4月27日06:59發表的評論
Great! Thanks for making progress brining xapi back to life!
It would be nice if the status page at http://jxapi.openstreetmap.org/xapi/admin/stats gave details on the ERROR, rather than simply saying ERROR.
由Tilo於2011年4月28日02:51發表的評論
I agree with Bryce on both!
about 14 days ago this request: *[bbox=8.173,49.815,9.173,50.554] worked fine.
size 523 MB
Yesterday in the afternoon and today (at night) I always got an error. I tried 5 times each. Neither the bbox limitation of 10 sqare degrees (less than 2 sqdeg here) nor the syntax should be a problem in this request. What are the other limitations which cause an error?
Have new limitations been implemented between apr,14 and apr,28?
由iandees於2011年4月28日02:52發表的評論
********THIS IS NOT A GOOD PLACE TO MAKE BUG REPORTS************. Do that here: https://github.com/iandees/xapi-servlet/issues