On 24/06/15 17:50, Paul wrote:
Hello,
One of the builtin geo predicates is ogc:asWKT
e.g.
@prefix ogc: <http://www.opengis.net/ont/geosparql#> .
:node1000032677 a :Geometry ;
ogc:asWKT "POINT(7.338818000000001 51.4433324)"^^ogc:wktLiteral .
A WKT literal however can start optionally with an identifier for a coordinate
system different from WGS 84.
e.g.
ogc:asWKT "<http://www.opengis.net/def/crs/EPSG/0/31370> POINT(142850.0
228850.0)"^^ogc:wktLiteral;
However Spatial Search seems to choke over this identifier.
Is ogc:asWKT limited to the default WGS 84 only within Spatial Search?
As far as I know, optionally coordinate systems are not supported, (the
source code would confirm or deny that) and I don't think there is the
capability to do coordinate transformation.
Jena uses JTS for WKT : the grammar shown does not have a coordinate
system:
http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/io/WKTReader.html
Andy
Paul
Kind Regards,
Paul Hermans
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