diff --git a/ontology/saref4city.ttl b/ontology/saref4city.ttl
index 6200fafc7fabf13efba444e26ebe8d4b27021001..7f235c6140d64d2ee61c5888b7bbf599518424bb 100644
--- a/ontology/saref4city.ttl
+++ b/ontology/saref4city.ttl
@@ -1,5 +1,4 @@
 @prefix : <https://saref.etsi.org/saref4city/> .
-@prefix wgs84: <http://www.w3.org/2003/01/geo/wgs84_pos#> .
 @prefix owl: <http://www.w3.org/2002/07/owl#> .
 @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
 @prefix xml: <http://www.w3.org/XML/1998/namespace> .
@@ -213,12 +212,6 @@ s4city:takesPlaceAtTime a owl:ObjectProperty ;
 
 
 
-# http://www.w3.org/2003/01/geo/wgs84_pos#location
-
-wgs84:location a owl:ObjectProperty ;
-    rdfs:comment "The relation between something and the point, or other geometrical thing in space, where it is.  For example, the realtionship between a radio tower and a Point with a given lat and long. Or a relationship between a park and its outline as a closed arc of points, or a road and its location as a arc (a sequence of points). Clearly in practice there will be limit to the accuracy of any such statement, but one would expect an accuracy appropriate for the size of the object and uses such as mapping ." ;
-	rdfs:label "location" .
-# 
 
 # 
 # 
@@ -253,26 +246,7 @@ s4city:hasLastUpdateDate a owl:DatatypeProperty ;
 # 
 
 
-wgs84:SpatialThing a owl:Class .
-
-wgs84:alt a owl:DatatypeProperty ;
-	rdfs:comment "The WGS84 altitude of a SpatialThing (decimal meters above the local reference ellipsoid)." ;
-	rdfs:label "altitude" ;
-	rdfs:domain wgs84:SpatialThing .
-# 
-# http://www.w3.org/2003/01/geo/wgs84_pos#lat
-
-wgs84:lat a owl:DatatypeProperty ;
-	rdfs:comment "The WGS84 latitude of a SpatialThing (decimal degrees)." ;
-	rdfs:label "latitude" ;
-	rdfs:domain wgs84:SpatialThing .
-# 
-# http://www.w3.org/2003/01/geo/wgs84_pos#long
 
-wgs84:long a owl:DatatypeProperty ;
-	rdfs:comment "The WGS84 longitude of a SpatialThing (decimal degrees)." ;
-	rdfs:label "longitude" ;
-	rdfs:domain wgs84:SpatialThing .
 # 
 # 
 # 
@@ -317,20 +291,7 @@ geo:SpatialObject a owl:Class ;
 	rdfs:isDefinedBy <http://www.opengis.net/ont/geosparql> ;
 	rdfs:label "SpatialObject"@en .
 # 
-# http://www.w3.org/2003/01/geo/wgs84_pos#Point
-
-wgs84:Point a owl:Class ;
-	rdfs:subClassOf geo:Geometry ;
-	rdfs:comment """ 
-Uniquely identified by lat/long/alt. i.e.
-
-spaciallyIntersects(P1, P2) :- lat(P1, LAT), long(P1, LONG), alt(P1, ALT),
-  lat(P2, LAT), long(P2, LONG), alt(P2, ALT).
 
-sameThing(P1, P2) :- type(P1, Point), type(P2, Point), spaciallyIntersects(P1, P2).
-  """ , "A point, typically described using a coordinate system relative to Earth, such as WGS84." ;
-	rdfs:isDefinedBy <http://www.w3.org/2003/01/geo/wgs84_pos#> ;
-	rdfs:label "Point"@en .
 # 
 # http://www.w3.org/2004/02/skos/core#Concept