define_new_grid: Define a floating grid coordinate reference system for a new...

In crowcanyon/localgrid: Coordinate Reference Systems for an Arbitrary Floating Grids

Description

#' This function defines a new floating grid coordinate reference system in the Oblique Mercator projection for a new floating grid based on the coordinates for a primary datum.

Usage

define_new_grid(pt_0_geo, pt_0_grid = c(0, 0), geo_crs = 4326, name = NULL)

Arguments

pt_0_geo	A numeric vector of the geographic coordinates (c(longitude, latitude)) of the primary datum, in WGS84 decimal degrees
pt_0_grid	A numeric vector of the geographic coordinates (c(easting, northing)) of the primary datum, in local coordinates (defaults to c(0,0))
geo_crs	The coordinate reference system of the geographic coordinates, defined using any method used by [sf::st_crs()] #' @param name An optional name for the floating grid coordinate reference system

Details

This function requires the latitude and longitude coordinates (in WGS84 decimal degrees) of the primary datum for a new floating grid.

Value

Object of class crs, which is a list with elements input (length-1 character) and wkt (length-1 character).

Examples

define_new_grid(
  pt_0_geo = c(-108.51, 37.385),
  pt_0_grid = c(500, 500),
  name = "Great New Grid"
)

# Or define from a different coordinate reference system:
define_new_grid(
  pt_0_geo = c(720446.8, 4140492.5),
  pt_0_grid = c(500, 500),
  geo_crs = 6341,
  name = "Great New Grid"
)

crowcanyon/localgrid documentation built on March 21, 2021, 4:36 a.m.