Flow diagram
Vector diagram

Thanks to loops

match(m)-[r]->(n)delete(r);match(m)delete(m);

create (nantes:Town{idd:'nantes',name:'',latitude:47 ,longitude: 1,height:0 , type:'location'});
create (tours:Town{idd:'tours',name:'',latitude:47 ,longitude: 0,height:0 , type:'location'});
create (nice:Town{idd:'nice',name:'',latitude:43 ,longitude: -7 ,height:0, type:'location'});
create (toulouse:Town{idd:'toulouse',name:'',latitude:43 ,longitude: -1,height:0 , type:'location'});

//https://neo4j.com/docs/cypher-manual/current/functions/spatial/#functions-distance
//distance(nantes, toulouse)
match (m),(n) where m.idd='nantes' and n.idd='toulouse'
with point({latitude:nantes.latitude, longitude:nantes.longitude}) as p1 and point({latitude:tours.latitude, longitude:tours.longitude}) as p2 return distance(p1,p2)