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We now have access to vast digital data resources that include geospatial referencing. This referencing ranges from precise geographic coordinates, through street addresses, to codes for administrative or other types of regions (such as zip codes and drainage basin indices). GPS receivers in locations such as vehicles, PDAs, and cell phones generate an increasing portion of these data. Specific examples of geospatially referenced data include • satellite remote sensing readings, •doi:10.1109/mcg.2004.1255801 pmid:15384662 pmcid:PMC3181162 fatcat:gqsjznmpcrfyvdn7dmfurwvcam