plot_flightline_points: Plot a sample of points using colours to indicate flight...

In mbedward/CERMBlidar: A collection of functions to process aerial LIDAR data

Plot a sample of points using colours to indicate flight lines

Description

Displays a random sample of points from a LAS object, coloured by flight line ID and facetted by point class. This is useful, for example, when diagnosing problems with overlapping flightlines or uneven point density.

Usage

plot_flightline_points(
  las,
  classes = c(2, 35),
  npts = 5000,
  shape = 16,
  size = 1
)

Arguments

las	A LAS object, e.g. imported using prepare_tile.
classes	An integer vector specifying the point classes to display. May include 2 (ground), 3 (low veg), 4 (mid veg), 5 (high veg), 35 (all veg - the three vegetation classes combined), 6 (buildings) and 9 (water). The default is to display ground (2) and all vegetation combined (35).
npts	Number of points to sample from the LAS data for drawing. Sampling is done proportionally across combinations of point classes and flight lines, and the resulting number of rows in the data element of the returned ggplot object can vary slightly. If displaying many point classes, increasing this value from the default (5000) and decreasing the point size will produce nicer plots.
shape	Point shape, specified as an integer code as for gpplot and R base plot.
size	Point size.

Value

A ggplot object.

See Also

get_flightline_polygons

Examples

## Not run: 
# Default plot of points for ground (class 2) and combined
# vegetation (classes 3-5).
plot_flightline_points(las)

# Display the vegetation classes both separately and combined
plot_flightline_points(las, classes = c(3:5, 35))

## End(Not run)

mbedward/CERMBlidar documentation built on April 10, 2024, 2:05 p.m.