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The application of geographic information systems to water quality monitoringedited by: M. F. Baumgartner, G. A. Schultz, A. I. JohnsonIAHS Publication In Remote sensing and geographic information systems for design and operation of water resources systems. Proceedings of an International Symposium (5th Scientific Assembly of the IAHS), 23 April to 3 May 1997, Vol. 242 (April 1997), pp. 189-195.
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AbstractMuch of the responsibility for reporting on surface water quality in South Africa rests with the Institute for Water Quality Studies (IWQS) of the Department of Water Affairs and Forestry. Geographic information systems (GIS) provide a means to summarize large amounts of spatially and temporally distributed data in an intelligible form. GIS developments at IWQS have progressed along two paths, application-specific tools and a general 'data mining' system for querying water quality data. Application-specific tools include utilities for cataloguing monitoring stations, checking monitoring frequency and mapping the water quality in village boreholes. The general system, 'WaterMarque', is a menu-driven front end to a suite of GIS macros and C programs. 'WaterMarque' allows the water quality expert to select monitoring stations interactively and analyse the chemical data. The results are reported symbolically on a map, as box and whisker plots, rose diagrams, ionic diagrams, star symbols, time series graphs or icons.
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