Author(s)

A.P. Murdock, H.H. Bottress & K.P. Morris

Abstract

Taking hydro-spatial analysis to another dimension using STEM, a 4D CIS A.P. Murdock\ H.H. Bottrelf & K.P. Morris^ ' ABP Research & Consultancy, Ltd, UK * Geokronos Ltd, UK Abstract A major barrier to hydrologists wishing to make use of Geographic Information Systems for their analysis, is the lack of any real temporal functionality provided by the leading software manufacturers. Hydrology far more than other disciplines, relies heavily upon the interpretation of temporal variations in the data, such as time-series of river discharges or fluxes of sediment. Currently, time series data are mostly viewed in 2D, as graphs, showing changes in the variable(s) of interest from the head of the catchment to the mouth. While this allows some degree of visualisation of how variables are changing down the catchment, it does not provide any indication of how they might be changing spatially over time. This overview is only provided when these variables are plotted on a map (3D). Current

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