This tool visualises the Geometric Quality of a survey setup using Least Squares Estimation (LSE). It calculates the theoretical "Error Ellipse" for a station position based on the relative geometry of the target points and the precision of the instrument.
How to Use
- Drag Points: Move the target points (Circles) or Station (Triangle) to simulate different site conditions.
- Add/Remove: Use the buttons to add more observations. Right-click a point to delete it.
- Instrument Specs: Adjust the sliders to see how using a more precise Total Station affects the result.
- Confidence: Toggle between 1σ (Raw Math) and 95% (Survey Standard) confidence levels.
Interpreting the Data
The red ellipse represents the area where the true position is likely to be.
- Standard Error (1σ): Represents approx 39% confidence in 2D.
- Survey Standard (95%): Represents the 1σ ellipse multiplied by 2.447.
- Scalar (DRMS): Distance Root Mean Square. A single number representing the "radius" of error (~63% confidence at 1σ).
Note: This tool is intended for educational purposes only.
Version: 1.0 (Beta) • Method: Parametric Least Squares Adjustment