Refining an object-oriented GIS design model: topologies and field data

In this paper we present an architecture to manipulate object topologies and field-oriented data. We first show how to extend the object oriented model presented in [5] by defining an extended location micro-arquitecture; next we explain how we use extended locations to define a set of structures and operations to manipulate different kinds of vector based topologies such as Node and ArcNode topologies. We then present the object-oriented architecture for dealing with field data; we show how this architecture alIows us to decouple data belonging to a continuous field from corresponding samples, their implementations and the estimation methods used to calculate points in the corresponding field. We finally discuss present some further work on implementing this architecture.