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.
토론
2011년 1월 26일 15:13에 Firefishy님의 의견
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
2011년 1월 26일 16:00에 Harry Wood님의 의견
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!
2011년 1월 26일 16:24에 Tom Chance님의 의견
Great, I'll give it a go.
2011년 1월 26일 16:37에 Maarten Deen님의 의견
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]
2011년 1월 26일 16:42에 iandees님의 의견
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.
2011년 1월 26일 16:48에 Tom Chance님의 의견
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]
2011년 1월 26일 16:53에 iandees님의 의견
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!
2011년 1월 27일 23:13에 Geonick님의 의견
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.
2011년 1월 28일 01:24에 iandees님의 의견
@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.
2011년 3월 9일 21:01에 Katzman님의 의견
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!
2011년 3월 9일 21:03에 iandees님의 의견
@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.
2011년 3월 21일 19:34에 Arminus님의 의견
Very nice ! Any updates on the relation problem ?
2011년 3월 31일 17:45에 Tilo님의 의견
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!
2011년 3월 31일 17:48에 Tilo님의 의견
[bbox=West,South,East,North]
if difference(West,East)*difference(South,North) > 10 --- denied
if difference(West,East)*difference(South,North) <= 10 --- accepted
2011년 3월 31일 17:51에 iandees님의 의견
@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.
2011년 3월 31일 17:51에 Tilo님의 의견
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
2011년 3월 31일 17:59에 Tilo님의 의견
Great! thanks a lot.
2011년 4월 1일 04:36에 Tilo님의 의견
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
2011년 4월 1일 05:12에 Tilo님의 의견
this worked:
way[boundary=administrative][bbox=8,48,10,52] (221655 elements)
but this didn't:
way[bbox=8,48,10,52]
???
2011년 4월 5일 09:44에 malcolmh님의 의견
Bounding boxes that straddle 180 E/W are rejected. I assume this is because West > East. Is this a bug or a feature?
2011년 4월 5일 10:47에 iandees님의 의견
This is not a good place to make bug reports. Do that here: https://github.com/iandees/xapi-servlet/issues
2011년 4월 12일 19:27에 Langlaeufer님의 의견
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
2011년 4월 12일 20:05에 iandees님의 의견
********THIS IS NOT A GOOD PLACE TO MAKE BUG REPORTS************. Do that here: https://github.com/iandees/xapi-servlet/issues
2011년 4월 17일 12:36에 Langlaeufer님의 의견
sorry, I do not like to register there!
2011년 4월 27일 06:59에 Bryce C Nesbitt님의 의견
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.
2011년 4월 28일 02:51에 Tilo님의 의견
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?
2011년 4월 28일 02:52에 iandees님의 의견
********THIS IS NOT A GOOD PLACE TO MAKE BUG REPORTS************. Do that here: https://github.com/iandees/xapi-servlet/issues