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EDM Calibration Baseline Fitting


EDMFit is an adjustment tool to estimate EDM calibration parameters.

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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.

EDM Calibration Baseline Fitting Web Site


  • EDM
  • Calibration
  • Guide to the Expression of Uncertainty in Measurement (DIN V ENV 13005)
  • Least squares adjustment
  • Variance-covariance-matrix
  • Electro-optical distance meters (ISO 17123-4)
  • Monte-Carlo-Simulation
  • Residual-Plot-Analysis
  • Dimensional Metrology


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Intended Audience

Education, Advanced End Users, Quality Engineers, Engineering

User Interface

Java Swing, Java AWT

Programming Language




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