For geographic information system (GIS)-based environmental modelling and assessment, proper selection, collection, and pre-processing of primary or secondary data is paramount. To this end, several preliminary requirements have been identified (Reed, Brown et al. 2002), such as the need for the data to be complete, up-to-date, and accurate, span multiple spatial and temporal scales, or be properly validated by field or laboratory based experimentation. Poor or conflicting resolution across datasets is another issue often encountered, like the limited availability of appropriate (i.e., viable, useful) information.
“Understanding how to compare the information,
what the differences are, and how its use could impact the model’s results, therefore, is a crucial step in environmental modelling and assessment.”
In the present study GIS was used to produce two analogous maps, to represent the generalized geologic age and features, of surface outcrops of bedrock in an arbitrary WA study site. The objective was to assess how efficacy of comparable geographical representations, can be curtailed by the lack of data consistency, accuracy and precision, across alternative providers.