An Error Ellipse
Interaction and visualization of the standard error ellipses for survey engineers
(Created by Swatchai Kriengkraipet)
Input data
(Representing precision quantities)
The resulting covariance matrix of (x,y)
The standard error ellipse plot:
Eigen values/vectors of covariance matrix
| Eigen values |
Eigen vectors |
| λ1 |
v1 |
| λ2 |
v2 |
Standard error ellipse's parameters
| Semi major axis (a) |
sqrt(λ2) |
| Semi minor axis (b) |
sqrt(λ1) |
| Axis_a rotation from N |
eig_vector |
©2021 Swatchai Kriengkraipet, Chulalongkorn University, Bangkok
