Maintenance work on the ZORA database servers is scheduled for Thursday 25th July 2019 from 19:00-20:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Dutton, Geoffrey; Edwardes, Alistair (2006). Ontological modelling of geographical relationships for map generalization. In: 8th Workshop on Progress in Automated Map Generalization, Vancouver WA, 2006 - 2006, online.