Interpolates and smooths a 2D curve at new arc length
interpolate_points_df.Rd
For a 2D curve with (x,y) coordinates parameterized by the arc length, interpolate new (x,y) coordinates at new arc lengths. Smooth the input data with a smoothing spline.
Usage
interpolate_points_df(
.data,
arclen,
x,
y,
arclen_out = NULL,
spar = 0.8,
tailmethod = "extrapolate",
.suffix = "_s",
.out = NULL,
overwrite = TRUE,
.frame = frame,
.point = point
)
Arguments
- .data
Data frame
- arclen
Name of the input arc length column in
.data
- x, y
Name of the columns that contain the coordinates of points on the curve
- arclen_out
Vector containing the new arc length
- spar
Smoothing parameter (ranges from 0 for no smoothing to 1 for high smoothing; see
smooth.spline()
for more details.)- tailmethod
('keep', 'extrapolate', or 'NA') Methods to estimate the position of the tail tip if the last value of
arclength_out
is longer than the maximum arc length in the current frame.'keep' to keep the existing tail point, even if it is not at the requested arc length
'extrapolate' to extrapolate a tail tip position, assuming that the curve continues straight
'NA' to use replace the tail point with NA in this case.
- .suffix
(default = '_s') Suffix to append to the names of the arclen, x, and y columns after smoothing and interpolation.
- .out
Names of the output columns. Defaults are (arclen = 'arclen_s', xs = 'xs', ys = 'ys'). Overrides the
.suffix
parameter if it is included.- overwrite
TRUE or FALSE to overwrite existing columns
- .frame
Name of the frame variable in the data frame
- .point
Name of the point variable in the data frame