Defining the reporting units
The reporting units part of the wizard allows you to define several parameters for the assessment results. These fields determine the units of measurement used to report the results and the level of confidence they should be assigned, as well as allow you to specify which standard should be used to calculate statistics and any measurement that can be used to define the uncertainty of the reference layer.
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Click the Reporting Units drop-down arrow and choose the unit of measurement you want to use for the points you create during the session.
The reporting units are the unit of measurement used with the results of the positional assessment process. You can use meters, feet, or centimeters.
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Click the Confidence Level drop-down arrow and choose the confidence level to be used with the statistics.
The confidence level is the degree of certainty of the final accuracy statistic, which is expressed as a percentage. You can choose 90, 95, or 99.
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Click the Calculation Method drop-down arrow and choose the calculation method that is going to be used to determine the statistics.
The calculation method used to determine the change in statistics. Either the National Geospatial-Intelligence Agency (NGA) Standard or United States Geological Survey (USGS) Standard can be used. Each standard is based on a specification for the NGA and USGS, respectively.
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If you know the CE accuracy value of the reference layer and want to use this value in the calculation to produce an absolute CE for the layer being evaluated, type this value in the Reference Layer ACE text box.
This is the value to be used for the uncertainty in the reference layer, if known. If this number is known, the resulting accuracy value will have absolute accuracy. If this number is unknown, the resulting accuracy value is relative to the reference layer.
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If you know the LE accuracy value of the reference layer and want to use this value in the calculation to produce an absolute LE for the layer being evaluated, type this value in the Reference Layer ALE text box.
This is the number of meters to be used for the uncertainty in the reference layer, if known. If this number is known, then the resulting accuracy value will have absolute accuracy. If this number is unknown, the resulting accuracy value is relative to the reference layer.
- Click Next.