Error Ellipses Visualization

Creation, interaction and visualization of error ellipses for survey engineers
(Created by Swatchai Kriengkraipet)

Input data for error ellipses plotting

(Representing precision quantities)
σx (m):



σy (m):



ρxy:

Another error ellipse to plot
x y diagonal
The resulting covariance matrix of (x,y)
. .
. .

Eigen values/vectors of covariance matrix
Eigen values Eigen vectors
λ1 v1
λ2 v2
Error ellipses' parameters
Parameters Std. EE EE_
Semi major axis (a) sqrt(λ2) sqrt(λ2)
Semi minor axis (b) sqrt(λ1) sqrt(λ1)
Axis_a rotation from N eigen_v eigen_v

©2021 Swatchai Kriengkraipet, Chulalongkorn University, Bangkok