Graphics for Data Quality by rogerholland

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									Graphics for Data Quality
Examples of Accuracy
                    Vertical




   Horizontal

Why Positional
Accuracy Matters!
                                Location of Monument
                                in “our data”




                                           Published
                                           Coordinates
                           Our GPS
                                           NAD83(86)
                           Coordinates
USGS Monument                              NAD83(HARN)
DFW Airport Bldg Scale                     “true location”
With GPS target  1 : 850
                                  Scale: 1 : 50
                                  Each pixel is 1.6 feet

								
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