Re: regd : geosparql queries inside Fuseki server

Andy Seaborne Sat, 18 Apr 2020 06:47:21 -0700

The literal need to have a datatype

"POLYGON((...))"^^<http://www.opengis.net/ont/geosparql#wktLiteral>


judging by your first message, they are strings.

    Andy

On 18/04/2020 13:03, manoj deshpande wrote:

I tried below query as per suggestion, But this also returns me no results.
Is the query is right ??

PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX geo: <http://www.opengis.net/ont/geosparql#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX : <http://example.org/#>
PREFIX geo: <http://www.opengis.net/ont/geosparql#>
PREFIX spatial: <http://jena.apache.org/spatial#>
SELECT ?object
WHERE {
GRAPH <http://project/base/default> {
     ?subject geo:asWKT ?object FILTER ( geo:equals(?object,
"POLYGON((8.463699817657472 48.99872928913063,8.463887572288515
48.998644821906865,8.46399486064911 48.998764483764916,8.46425771713257
48.99865538031766,8.464375734329225 48.998746886450874,8.463919758796694
48.99893693711346,8.463699817657472 48.99872928913063))"))
} }


*Results*

{
   "head": {
     "vars": [ "object" ]
   } ,
   "results": {
     "bindings": [

     ]
   }
}

Thanks & Regards
Manoj

On Sat, Apr 18, 2020 at 12:27 PM Lorenz Buehmann <
buehm...@informatik.uni-leipzig.de> wrote:

geo:equals is a filter function and not a property function. This means
it returns a boolean value, thus, you have to use it in a FILTER

(untested)

FILTER(geo:equals(?object,
                               "POLYGON((8.463699817657472
48.99872928913063,8.463887572288515 48.998644821906865,8.46399486064911
48.998764483764916,8.46425771713257 48.99865538031766,8.464375734329225
48.998746886450874,8.463919758796694 48.99893693711346,8.463699817657472
48.99872928913063))"
                               )
            )


On 18.04.20 12:19, manoj deshpande wrote:

I am using Apache Jena Fuseki Server for Storing Geo Coordinates of
location. How to find out that if two polygons or two rectangles
intersect each other inside Fuseki.

I have stored geocoordinates in WKT serialization format. When I
execute below query

|*PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX rdf:
<http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX geo:
<http://www.opengis.net/ont/geosparql#> PREFIX xsd:
<http://www.w3.org/2001/XMLSchema#> PREFIX rdfs:
<http://www.w3.org/2000/01/rdf-schema#> PREFIX :
<http://example.org/#> PREFIX geo:
<http://www.opengis.net/ont/geosparql#> PREFIX spatial:
<http://jena.apache.org/spatial#> SELECT ?object WHERE { GRAPH
<http://project/base/default> { ?subject geo:asWKT ?object . } }*|||
I get these below results.
|object 1 "POLYGON((8.463699817657472
48.99872928913063,8.463887572288515
48.998644821906865,8.46399486064911
48.998764483764916,8.46425771713257
48.99865538031766,8.464375734329225
48.998746886450874,8.463919758796694
48.99893693711346,8.463699817657472 48.99872928913063))" 2
"POLYGON((8.463560342788698 48.99847940651206,8.463560342788698
48.99864834137738,8.46377491950989 48.99864834137738,8.46377491950989
48.99847940651206,8.463560342788698 48.99847940651206))" 3
"POLYGON((8.463447690010073 48.99835974396915,8.463447690010073
48.99849348443939,8.463646173477175
48.99849348443939,8.463646173477175
48.99835974396915,8.463447690010073 48.99835974396915))" 4
"POLYGON((8.463254570961 48.99821544463795,8.463254570961
48.99838438039854,8.463635444641115
48.99838438039854,8.463635444641115 48.99821544463795,8.463254570961
48.99821544463795))" 5 "POLYGON((8.463689088821413
48.99826823712468,8.463689088821413 48.99845477012966,8.46402168273926
48.99845477012966,8.46402168273926 48.99826823712468,8.463689088821413
48.99826823712468))" 6 "POLYGON((8.463892936706545
48.99843013373508,8.463892936706545
48.998588510344774,8.464316725730898
48.998588510344774,8.464316725730898
48.99843013373508,8.463892936706545 48.99843013373508))" 7
"POLYGON((8.463093638420107 48.99805354732974,8.463093638420107
48.998243600637835,8.463737368583681
48.998243600637835,8.463737368583681
48.99805354732974,8.463093638420107 48.99805354732974))" 8
"POLYGON((8.463619351387026 48.99797963751407,8.463619351387026
48.998180249615714,8.464118242263796
48.998180249615714,8.464118242263796
48.99797963751407,8.463619351387026 48.99797963751407))" 9
"POLYGON((8.464407920837404 48.998303432084754,8.464407920837404
48.99857443244431,8.46477270126343 48.99857443244431,8.46477270126343
48.998303432084754,8.464407920837404 48.998303432084754))" 10
"POLYGON((8.464225530624391 48.99806762537742,8.464225530624391
48.99839141937611,8.464820981025698
48.99839141937611,8.464820981025698
48.99806762537742,8.464225530624391 48.99806762537742))"|
|Then later I want to filter out these geo:WKT objects based on
geo:intersection (Intersection or equals or contains methods). And I
updated my query as below. |
|
|*PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX rdf:
<http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX geo:
<http://www.opengis.net/ont/geosparql#> PREFIX xsd:
<http://www.w3.org/2001/XMLSchema#> PREFIX rdfs:
<http://www.w3.org/2000/01/rdf-schema#> PREFIX :
<http://example.org/#> PREFIX geo:
<http://www.opengis.net/ont/geosparql#> PREFIX spatial:
<http://jena.apache.org/spatial#> SELECT ?object WHERE { GRAPH
<http://project/base/default> { ?subject geo:asWKT ?object . ?object
geo:equals "POLYGON((8.463699817657472
48.99872928913063,8.463887572288515
48.998644821906865,8.46399486064911
48.998764483764916,8.46425771713257
48.99865538031766,8.464375734329225
48.998746886450874,8.463919758796694
48.99893693711346,8.463699817657472 48.99872928913063))" } } *|
|Which should result me atleast the coordinates of first geo object
which really equals the POLYGON coordinates but I get empty results as
shown in below image. Please suggest me where I am getting it wrong.**|
But I get no results as attached in snapshot. Please help me regarding

this.|

Re: regd : geosparql queries inside Fuseki server

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