point: Make WKT point objects

Description Usage Arguments Details See Also Examples

View source: R/point.R

Description

Make WKT point objects

Usage

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point(..., fmt = 16, third = "z")

Arguments

...

A GeoJSON-like object representing a Point, LineString, Polygon, MultiPolygon, etc.

fmt

Format string which indicates the number of digits to display after the decimal point when formatting coordinates. Max: 20

third

(character) Only applicable when there are three dimensions. If m, assign a M value for a measurement, and if z assign a Z value for three-dimenionsal system. Case is ignored. An M value represents a measurement, while a Z value usually represents altitude (but can be something like depth in a water based location).

Details

The third parameter is used only when there are sets of three points, and you can toggle whether the object gets a Z or M.

When four points are included, the object automatically gets assigned ZM

See Also

Other R-objects: circularstring, geometrycollection, linestring, multilinestring, multipoint, multipolygon, polygon

Examples

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## empty point
point("empty")
# point("stuff")

## single point
point(-116.4, 45.2)
point(0, 1)

## single point, from data.frame
df <- data.frame(lon=-116.4, lat=45.2)
point(df)

## many points, from a data.frame
ussmall <- us_cities[1:5, ]
df <- data.frame(long = ussmall$long, lat = ussmall$lat)
point(df)

## many points, from a matrix
mat <- matrix(c(df$long, df$lat), ncol = 2)
point(mat)

## single point, from a list
point(list(c(100.0, 3.101)))

## many points, from a list
point(list(c(100.0, 3.101), c(101.0, 2.1), c(3.14, 2.18)))

## when a 3rd point is included
point(1:3, third = "m")
point(1:3, third = "z")
point(list(1:3, 4:6), third = "m")
point(list(1:3, 4:6), third = "z")
point(matrix(1:9, ncol = 3), third = "m")
point(matrix(1:9, ncol = 3), third = "z")
point(data.frame(1, 2, 3), third = "m")
point(data.frame(1, 2, 3), third = "z")
point(data.frame(1:3, 4:6, 7:9), third = "m")

## when a 4th point is included
point(1:4)
point(list(1:4, 5:8))
point(matrix(1:12, ncol = 4))
point(data.frame(1, 2, 3, 4))
point(data.frame(1:3, 4:6, 7:9, 10:12))

ropensci/wellknown documentation built on May 19, 2018, 9:21 p.m.