| calculateParameters {vec2dtransf} | R Documentation |
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!