getCRS: Return a "proj4" string for a datum and projection

In adamlilith/enmSdm: Tools for Modeling Niches and Distributions of Species

Return a "proj4" string for a datum and projection

Description

This function returns the "proj4" string for a particular datum and possibly projection. It is intended to be easier to use than looking up particular proj4 strings (i.e., on the web).

Usage

getCRS(x, asCRS = FALSE)

Arguments

x

Character. Name of proj4 string to return. Possible values include: albersNA Albers equal-area conic for North America: +proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=37.5 +lon_0=-96 +x_0=0 +y_0=0 +ellps=GRS80 +datum=NAD83 +units=m +no_defs albersEur Albers equal-area conic for Europe: +proj=aea +lat_1=43 +lat_2=62 +lat_0=30 +lon_0=10 +x_0=0 +y_0=0 +ellps=intl +units=m +no_defs madAlbers Albers equal-area conic for Madagascar: +proj=aea +lat_1=-14 +lat_2=-24 +lat_0=-19 +lon_0=47 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs +ellps=WGS84 climateNA ClimateNA dataset: +proj=lcc +lat_1=49 +lat_2=77 +lat_0=0 +lon_0=-95 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs +ellps=WGS84 chelsa CHELSA climate dataset (actually WGS84): or +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 dayMet DayMet dataset: +proj=lcc +lon_0=-100 +lat_0=42.5 +x_0=0 +y_0=0 +a=6378137 +rf=298.257223563 +lat_1=25 +lat_2=60 lccCONUS Lambert conformal conic for the contiguous United States: +proj=lcc +lat_1=33 +lat_2=45 +lat_0=39 +lon_0=-96 +x_0=0 +y_0=0 +ellps=GRS80 +datum=NAD83 +units=m +no_defs lccEp Lambert conformal conic for Europe: +proj=lcc +lat_1=43 +lat_2=62 +lat_0=30 +lon_0=10 +x_0=0 +y_0=0 +ellps=intl +units=m +no_defs lccNA Lambert conformal conic for North America: +proj=lcc +lat_1=20 +lat_2=60 +lat_0=40 +lon_0=-96 +x_0=0 +y_0=0 +ellps=GRS80 +datum=NAD83 +units=m +no_defs lccNAsia Lambert conformal conic for North Asia: +proj=lcc +lat_1=15 +lat_2=65 +lat_0=30 +lon_0=95 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs lccSA Lambert conformal conic for South America: +proj=lcc +lat_1=-5 +lat_2=-42 +lat_0=-32 +lon_0=-60 +x_0=0 +y_0=0 +ellps=aust_SA +units=m +no_defs lccSAsia Lambert conformal conic for South Asia: +proj=lcc +lat_1=7 +lat_2=-32 +lat_0=-15 +lon_0=125 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs laeaN Lambert azimuthal equal area for the North Pole: +proj=laea +lat_0=90 +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs laeaS Lambert azimuthal equal area for the South Pole: +proj=laea +lat_0=-90 +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs mollweide Mollweide equal-area for the world: +proj=moll +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs codenad27 NAD27 (unprojected): +proj=longlat +datum=NAD27 +no_defs +ellps=clrk66 +nadgrids=@conus,@alaska,@ntv2_0.gsb,@ntv1_can.dat nad83 NAD83 (unprojected): +proj=longlat +datum=NAD83 +no_defs +ellps=GRS80 nad83harn NAD83 HARN (unprojected): +proj=longlat +ellps=GRS80 +no_defs plateCaree Plate Caree using WGS84: +proj=eqc +lat_ts=0 +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_def prism PRISM dataset (actually WGS84): +proj=longlat +ellps=GRS80,0,0,0,0 +no_defs robinson Robinson: +proj=robin +lon_0=0 +x_0=0 +y_0=0 wgs72 CRS for WGS72 (unprojected): +proj=longlat +ellps=WGS72 +no_defs wgs84 CRS for WGS84 (unprojected): +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 worldclim WORLDCLIM climate data set (actually WGS84): +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 UTM projections require the datum (e.g., NAD27, NAD83, WGS84, etc.), the hemisphere (north or south) and the zone. The "code" is as: utm<coordinate system><hemisphere><zone>. For example, utmNad83north9 returns the CRS for UTM zone 9 in the northern hemisphere using the NAD83 coordinate reference system. Likewise, utmNad27south6 returns the CRS for UTM zone 6 in the southern hemisphere using the NAD27 coordinate system. So far the following have been implemented: Coordinate Systems: nad27, nad83, wgs84 Hemispheres: north

asCRS

Logical. If TRUE then return object is of class CRS. If FALSE (default) then returned object is of class character.

Value

Object of class CRS or character.

See Also

makeCRS

Examples

getCRS('wgs84')
getCRS('prism')
getCRS('mollweide', TRUE)

adamlilith/enmSdm documentation built on Jan. 6, 2023, 11 a.m.