Abstract
Many scientists use geographic location as a fundamental attribute to identify interesting earth-science data sets. The specification of this attribute in database queries is both tedious and prone to error. MAPWD is a graphical tool which simplifies this specification by allowing the user to point to areas of interest using an electronic map, instead of manually entering coordinate values. With this tool the user is able to identify regions of interest using maps with comparable detail at a wide range of spatial scales. This functionality has been achieved by hierarchically structuring the database of map vector data into separate files based on both geographic location and resolution.
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