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British Coal Opencast, Mansfield, Nottinghamshire, UK
A set of programs have been developed to compute moving-windows statistics from spatial data, which are fully interactive, allowing the user to compute and display two plan views of the window statistics, the parent population histogram and the two histograms of the windows statistics all on one graphical display. Stationarity of a deposit can be checked instantly at differing window sizes with all the sample data or with partitioned subsets. Data can be read into the routine from a current exploration campaign or from working site-survey data, allowing comparisons between ‘projected’ and ‘ground’ truth. Screen and DXF file output of the local neighbourhood window statistics are plotted in a colour which corresponds to standard confidence bands of the parent or global distribution. Rapid identification of local anomalies is possible. Window statistics for all the neighbourhoods can be written to file at any subset number of the original sample number. Plots of the window means and standard deviations versus numbers of boreholes allow the exploration geologist to check stationarity in a retrospective way. The main aim in the development of these routines was to reduce the amount of user keystrokes needed to compute and display the maximum amount of neighbourhood information. The technique is demonstrated with examples from UK Coal Measures.
