Calculate the module and azimuth of the difference on x and y coordinates between two sets of
ground control points (GCP). It is suited to perform calculations for topographical
coordinates only. The origin is set in the y coordinate, and rotation performed clockwise.
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
A data frame containing the module, its square and azimuth. These three columns are named
‘module’, ‘sq.module’ and ‘azimuth’.
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.
https://CRAN.R-project.org/package=VecStatGraphs2D.