numberCorner: Get the UTM coordinates with the corner of the plot

In BIOMASS: Estimating Aboveground Biomass and Its Uncertainty in Tropical Forests

Get the UTM coordinates with the corner of the plot

Description

Get the UTM coordinates from the latitude and longitude of the corners of a plot. The function also assign a number to the corners in a clockwise or counterclockwise way, with the number 1 for the XY origin. Corner numbering is done as followed:

• axis X: the corner 1 to the corner 2

• axis Y: the corner 1 to the corner 4

Usage

numberCorner(longlat = NULL, projCoord = NULL, plot, origin, clockWise)

Arguments

longlat	(optional) data frame with the coordinates in longitude latitude (eg. cbind(longitude, latitude)).
projCoord	(optional) data frame with the projected coordinates in X Y
plot	A vector of codes (names) of the plots
origin	A logical vector with TRUE corresponding of the origin of the axis of each plot.
clockWise	A logical, whether the numbering should be done in a clockwise (TRUE) or counterclockwise (FALSE) way.

Value

A data frame with:

• plot: The code of the plot

• X: The coordinates X in UTM

• Y: The coordinates Y in UTM

• corner: The corner numbers

Author(s)

Arthur PERE, Maxime REJOU-MECHAIN

Examples

coord <- data.frame(X = c(0, 200, 0, 200), Y = c(0, 0, 200, 200)) + 5000
plot <- rep("plot1", 4)
origin <- c(FALSE, FALSE, TRUE, FALSE)

# if you turn clock wise
corner <- numberCorner(projCoord = coord, plot = plot, origin = origin, clockWise = TRUE)

# Plot the plot
plot(coord, asp = 1)
text(coord, labels = corner$corner, pos = 1)


# Using a counterclockwise way
corner <- numberCorner(projCoord = coord, plot = plot, origin = origin, clockWise = FALSE)

# Plot the plot
plot(coord, asp = 1)
text(coord, labels = corner$corner, pos = 1)

BIOMASS documentation built on Sept. 29, 2023, 5:09 p.m.