Hi there,
Thank you for the complete example.
I've created JENA-649 to record this (so it does not get lost in email).
Andy
https://issues.apache.org/jira/browse/JENA-649
On 03/03/14 22:27, Heidi McClure wrote:
No, I don't think it's taking 700 and treating as km. When I use 1126 mi (yes,
I tested with mi in this experiment because km gave me no results) where 1126
km is approximately 700 mi it gives me a few points but not all that I expect.
Here is some data and queries that should work but don't along with some bad
queries that do work using very large radii.
Using http://www.freemaptools.com/measure-distance.htm
Distance between Assault and Knife is approx. 93 mi.
Distance between Assault and Robbery is approx. 250 mi.
Point used for within query is the point of the Assault.
data:
<http://example.com/event#event_3> <http://example.com/event#type>
"Knife"^^<http://www.w3.org/2001/XMLSchema#string> .
<http://example.com/event#event_3> <http://www.opengis.net/ont/geosparql#asWKT>
"POINT(35.46883 -104.39098)"^^<http://www.opengis.net/ont/geosparql#wktLiteral> .
<http://example.com/event#event_3> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://example.com/event#type> .
<http://example.com/event#event_4> <http://example.com/event#type>
"Assault"^^<http://www.w3.org/2001/XMLSchema#string> .
<http://example.com/event#event_4> <http://www.opengis.net/ont/geosparql#asWKT>
"POINT(36.34 -103.13)"^^<http://www.opengis.net/ont/geosparql#wktLiteral> .
<http://example.com/event#event_4> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://example.com/event#type> .
<http://example.com/event#event_6> <http://example.com/event#type>
"Robbery"^^<http://www.w3.org/2001/XMLSchema#string> .
<http://example.com/event#event_6> <http://www.opengis.net/ont/geosparql#asWKT>
"POINT(32.8657 -104.21235)"^^<http://www.opengis.net/ont/geosparql#wktLiteral> .
<http://example.com/event#event_6> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://example.com/event#type> .
simplistic test - returns all 3 records
SELECT DISTINCT ?Event ?Location WHERE {
?Event <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://example.com/event#type> .
?Event <http://www.opengis.net/ont/geosparql#asWKT> ?Location }
FAILS: withinCircle of 100 mi radius - returns no records - should return 2
SELECT DISTINCT ?Event ?Location WHERE {
?Event <http://jena.apache.org/spatial#withinCircle> (36.34 -103.13 100 'mi') .
?Event <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://example.com/event#type> .
?Event <http://www.opengis.net/ont/geosparql#asWKT> ?Location }
FAILS: withinCircle of 275 mi radius - returns no records - should return 3
records
SELECT DISTINCT ?Event ?Location WHERE {
?Event <http://jena.apache.org/spatial#withinCircle> (36.34 -103.13 275 'mi') .
?Event <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://example.com/event#type> .
?Event <http://www.opengis.net/ont/geosparql#asWKT> ?Location }
BAD: withinCircle of 9400 mi radius - returns 2 records
SELECT DISTINCT ?Event ?Location WHERE {
?Event <http://jena.apache.org/spatial#withinCircle> (36.34 -103.13 9400 'mi') .
?Event <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://example.com/event#type> .
?Event <http://www.opengis.net/ont/geosparql#asWKT> ?Location }
BAD: withinCircle of 9450 mi radius - returns all 3 records
SELECT DISTINCT ?Event ?Location WHERE {
?Event <http://jena.apache.org/spatial#withinCircle> (36.34 -103.13 9450 'mi') .
?Event <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://example.com/event#type> .
?Event <http://www.opengis.net/ont/geosparql#asWKT> ?Location }
thanks,
-heidi
-----Original Message-----
From: Andy Seaborne [mailto:[email protected]]
Sent: Monday, March 03, 2014 2:25 PM
To: [email protected]
Subject: Re: Spatial withinCircle distances
On 03/03/14 20:17, Heidi McClure wrote:
Hello,
I'm using Jena version 2.11.1. When I use withinCircle, I don't see
results that I would expect - I am able to plot a set of points in a
geospatial application and measure the distance from point 1 to the
other points - they are all within 700 miles of point 1. When I do a
similar query using the withinCircle API in spatial Jena, I don't get
any points! When I double 700 mi to 1400 miles I get the results I
expected with 700 miles.
Am I using the API incorrectly? Does the withinCircle use the number
I pass in as a diameter of a circle centered at the POINT and not a
radius from the POINT?
Heidi,
I'm not sure but I'm afraid you may have tripped over another, fixed bug.
Would if the engine was treating 700 as kilometres explain what you are seeing?
This was fixed after the 2.11.1 version - it is available in development builds.
https://repository.apache.org/content/repositories/snapshots/org/apache/jena/
The bug was in the query processing - the data is OK.
If you try this, could let the list know whether it works; otherwise could you
provide a complete, minimal example that can be debugged?
https://issues.apache.org/jira/browse/JENA-623
Andy
