Marsh, S.C.Grimsdale, R.L.2014-10-212014-10-2119871467-8659https://doi.org/10.1111/j.1467-8659.1987.tb00353.xThe creation of databases for real-time image generation systems is expensive and time consuming. This is mostly due to the method of defining the world models which can currently represent an area of up to 500,000 sq Km. This paper suggests that abstract data types can decline the necessary elements of world models. A programming language containing these data types can then be used to specify the construction of world models, and greatly reduce the time taken to create the databases.10.1111/j.1467-8659.1987.tb00353.x77-85