This function calculates the module and azimuth of the difference on x and y
coordinates between two sets of ground control points (GCP).
Usage
gcpVector(dx, dy)
Arguments
dx
Numeric vector containing the difference on the x
coordinate between two sets of GCP.
dy
Numeric vector containing the difference on the y
coordinate between two sets of GCP.
Value
An object of the class data.frame containing the module, its
square and azimuth. These three columns are named module,
sq.module and azimuth.
Details
This function is suited to perform calculations for topographical
coordinates only. The origin is set in the y coordinate, and rotation
performed clockwise.
References
Ruiz-Cuetos J.C., Polo M.E. and Rodriguez P.G. (2012).
VecStatGraphs2D: Vector analysis using graphical and analytical
methods in 2D. R package version 1.6.
http://CRAN.R-project.org/package=VecStatGraphs2D