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Positional Accuracy in Data Graphics: A Case Study on Monument Location

Explore the significance of positional accuracy in data presentation through examples of vertical and horizontal accuracy, using GPS coordinates like NAD83(86) and NAD83(HARN) to determine true locations of monuments such as USGS Monument at DFW Airport. Understand the impact of scale and pixel size on accuracy.

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Positional Accuracy in Data Graphics: A Case Study on Monument Location

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Presentation Transcript

  1. Graphics for Data Quality

  2. Examples of Accuracy

  3. Vertical Horizontal Why Positional Accuracy Matters!

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

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