calculateParameters: Calculate parameters

In vec2dtransf: 2D Cartesian Coordinate Transformation

Calculate parameters

Description

Calculates transformation parameters from control points

Usage

calculateParameters(object)

Arguments

object

Object of the class SimilarityTransformation or AffineTransformation

Details

If control points are provided, the 'calculateParameters' method must be used in order to calculate the transformation parameters. If there are more control points than required (2 for similarity and 3 for affine) Least Squares is applied and therefore residuals as well as Root Mean Square Error (RMSE) are available via 'getResiduals' and 'getRMSE' methods. Parameters can always be accessed via 'getParameters' method.

Value

Modifies the original object

Author(s)

German Carrillo

References

Iliffe, J. and Lott, R. Datums and map projections: For remote sensing, GIS and surveying. Section 4.5. pp.109-117, 2008.

UC Davis Soil Resource Laboratory. Case Study: Fixing Bad TIGER Line data with R and PostGIS. <URL: http://casoilresource.lawr.ucdavis.edu/drupal/node/433>

See Also

SimilarityTransformation, AffineTransformation, getResiduals, getRMSE, getParameters

Examples

data(control.points)
at <- AffineTransformation(control.points[2:5])
getParameters(at) # Still unknown 
calculateParameters(at)
getParameters(at) # Now there are parameters!

vec2dtransf documentation built on Aug. 23, 2023, 5:07 p.m.