raster: isLonLat – R documentation

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isLonLat

Is this longitude/latitude data?

Description

Test whether a Raster* or other object has a longitude/latitude coordinate reference system (CRS) by inspecting the PROJ.4 coordinate reference system description. couldBeLonLat also returns TRUE if the CRS is NA but the x coordinates are within -365 and 365 and the y coordinates are within -90.1 and 90.1.

Usage

## S4 method for signature 'BasicRaster'
isLonLat(x, ...)
## S4 method for signature 'Spatial'
isLonLat(x, ...)
## S4 method for signature 'BasicRaster'
couldBeLonLat(x, warnings=TRUE, ...)
## S4 method for signature 'Spatial'
couldBeLonLat(x, warnings=TRUE, ...)

Arguments

`x`	Raster* or Spatial* object
`warnings`	logical. If `TRUE`, a warning is given if the CRS is `NA` or when the CRS is longitude/latitude but the coordinates do not match that
`...`	additional arguments. None implemented

Value

Logical

Examples

r <- raster()
isLonLat(r)
crs(r) <- "+proj=lcc +lat_1=48 +lat_2=33 +lon_0=-100 +ellps=WGS84"
isLonLat(r)

raster

Geographic Data Analysis and Modeling

v3.4-10

GPL (>= 3)

Authors

Robert J. Hijmans [cre, aut] (<https://orcid.org/0000-0001-5872-2872>), Jacob van Etten [ctb], Michael Sumner [ctb], Joe Cheng [ctb], Dan Baston [ctb], Andrew Bevan [ctb], Roger Bivand [ctb], Lorenzo Busetto [ctb], Mort Canty [ctb], Ben Fasoli [ctb], David Forrest [ctb], Aniruddha Ghosh [ctb], Duncan Golicher [ctb], Josh Gray [ctb], Jonathan A. Greenberg [ctb], Paul Hiemstra [ctb], Kassel Hingee [ctb], Institute for Mathematics Applied Geosciences [cph], Charles Karney [ctb], Matteo Mattiuzzi [ctb], Steven Mosher [ctb], Babak Naimi [ctb], Jakub Nowosad [ctb], Edzer Pebesma [ctb], Oscar Perpinan Lamigueiro [ctb], Etienne B. Racine [ctb], Barry Rowlingson [ctb], Ashton Shortridge [ctb], Bill Venables [ctb], Rafael Wueest [ctb]

Initial release

2021-05-02