xlCRS: Coordinate Reference System objects

In xinye1/xltools: Xinye Li's R Toolkit

Description

Returns a CRS object for geo-spatial analysis.

Usage

xlCRS(system = "wgs84")

Arguments

system

A string, either wgs84 (default), bng or google.

Details

There are a few constants that are useful in geo-spatial analysis: CRS such as World Geodetic System (wgs84) and British National Grid (bng).

Input system can be one of the below values:

• wgs84: EPSG:4326, WGS 84 aka the latest version of World Geodetic System (1984), with the generic latitude and longitude measured degrees.

• bng: EPSG:27700, British National Grid, with easting and northing measured in meters.

• google: EPSG:3857, the Web Mercator project, aka the Google projection. Sometimes the reference is also EPSG:900913. If it's not obvious, squint and look again. Still no? 900913 spells Google.

Value

A CRS (coordinate reference system) object from calling CRS. So far the elements are the CRS objects wgs84, bng and google. More will come as needed.

References

http://spatialreference.org/ref/epsg/.

xinye1/xltools documentation built on Dec. 2, 2020, 7:23 p.m.