Abstract
Groundwater pollution shold be visulazed by spatial maps, in order to know how the spatial pollutant situation is, the visualization analysis is adopted to analyse the regional pollution with monitoring data. Map is a visual means of symbolic expression to map data, ArcObjects provides a number of symbolic objects to render thematic maps, and these component objects are consisted with three series of Color, Symbol and Renderer. On the development platform C#.NET, taking geographic information system components (COMGIS), the thematic map program is designed and implemented by C# language and Arc Objects component, which is run correctly, thematic maps can be loaded to display the legend, and the grade levels number can be calculated automatically and set by user freely.
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