EDM Calibration Baseline Fitting

An EDM calibration baseline is used to derive specific instrument errors of the electronic distance measurement (EDM) unit of a total station. EDMFit is a simple adjustment tool to estimate the EDM calibration parameters (addition constant and/or scale parameter). The adjustment process is according to ISO 17123-4. The parameters are checked for significance, to avoid an overestimation.

Based on two classical hypothesis testing, EDMFit provides a reliable outlier detection. For uncertainties budgeting, EDMFit makes use of Monte-Carlo simulations and supports different distribution function:

– Uniform distribution,
– Triangular distribution and
– Gaussian (normal) distribution.

For refractive index determination, the application supports the following models:

– Barrel and Sears (1939),
– Edlen (1953, 1966),
– Owens (1967),
– IAG (1999) and
– Ciddor (1996, 2002).

The results of the adjustment are reported in a template-based and valid HTML5/CSS3 report.

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