etrsPoints.default: '"etrsPoints"' is the '"EtrsPoints"' object constructor

In etsakl/DasyMapR: Geographical ETRS-LAEA Grid Based Dasymetric Mapping

Description

"etrsPoints" is the "EtrsPoints" object constructor

Usage

etrsPoints.default(eastings.northings = "matrix", cell.size = "numeric")

Arguments

eastings.northings	: a matrix of coordinates
cell.size	: a numeric object represnts the cell size of the grid

Value

An EtrsPoints object

Examples

# Test for EtrsPoint
bb <- bbox(cbind(c(4321000, 4323000), c(3210000,3212000)))
cell.size = 1000
# Calculate the limits of the grid
bb.outer.limits <- cbind((floor(bb[, 1]/cell.size))*cell.size,(ceiling(bb[,2]/cell.size))*cell.size)
eastings <- seq(from = bb.outer.limits[1, 1], to = bb.outer.limits[1, 2], by = cell.size)
#Calculates northings
northings <- seq(from = bb.outer.limits[2, 1], to = bb.outer.limits[2, 2], by = cell.size)
eastings.northings <- as.matrix(expand.grid(eastings, northings))
low.corner.cell.etrs.points<-etrsPoints(eastings.northings = eastings.northings,cell.size=1000)
plot(low.corner.cell.etrs.points)
text(eastings.northings[,1]+200,eastings.northings[,2],low.corner.cell.etrs.points[["NORTHOFORIGIN"]])
text(eastings.northings[,1],eastings.northings[,2]+200,low.corner.cell.etrs.points[["EASTOFORIGIN"]],srt=90)
title("Lower Cell Corner Etrs Points using ETRS-LAEA")

etsakl/DasyMapR documentation built on May 16, 2019, 9:07 a.m.