ERRORS AND ACCURACY

ERRORS AND ACCURACY - ERRORS AND ACCURACY note Units 45 and...

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ERRORS AND ACCURACY note: Units 45 and 46 discuss this topic in detail there is a nearly universal tendency to lose sight of errors once the data are in digital form errors: o are implanted in databases because of errors in the original sources (source errors) o are added during data capture and storage (processing errors) o occur when data are extracted from the computer o arise when the various layers of data are combined in an analytical exercise Original Sin - errors in sources are extremely common in non-mapped source data, such as locations of wells, or lot descriptions can be caused by doing inventory work from aerial photography and misinterpreting images often occur because base maps are relied on too heavily o a recent attempt in Minnesota to overlay Department of Transportation bridge locations on USGS transportation data resulted in bridges lying neither beneath roads, nor over water, and roads lying apparently under rivers o until they were compared in this way, it was assumed that each data set was
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This note was uploaded on 12/04/2011 for the course FRE 1120 taught by Professor Celiaroberts during the Fall '10 term at Broward College.

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ERRORS AND ACCURACY - ERRORS AND ACCURACY note Units 45 and...

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