Select Projection System for RAP Extent

This function provides several "standard" projected Coordinate Reference Systems that are suitable for representing Rangeland Analysis Platform products across the contiguous (lower 48) United States at the specified resolution (in meters).

Usage

rap_projection(x, res)

Arguments

x

character. One of "CONUS_AEA", "CONUS_EQUI7", "CONUS_IGH"

res

integer. Resolution in meters.

Value

An empty SpatRaster object with a standard extent (xmin,ymax,xmax,ymin), resolution and projected Coordinate Reference System.

Details

Currently there are three pre-calculated grid systems that have their extent designed to align at 1, 5, 10, 30, 100, and 300 meter resolutions.

"CONUS_AEA" is the default template used with get_rap(source="rap-10m") when data spanning multiple UTM zones are requested, unless user specifies their own template via SpatRaster object as x or template argument.

Grid Specifications

• "CONUS_AEA": Albers Equal Area Conic projection for CONUS extent.

  • xmin = -2356300

  • ymax = 3172500

  • xmax = 2264000

  • ymin = 270000

  • crs = "EPSG:5070"

• "CONUS_EQUI7: Equi7Grid projection for CONUS + Hawaii extent.

  • xmin = 599500

  • ymax = 4967500

  • xmax = 10737100

  • ymin = 1913500

  • crs = "EPSG:27705"

• "CONUS_IGH": Interrupted Goode Homolosine projection for CONUS extent.

  • xmin = -13390500

  • ymax = 5836700

  • xmax = -8268600

  • ymin = 2480600

  • crs = "+proj=igh"

See also

get_rap()

Examples

rap_projection("CONUS_AEA", 10)
#> class       : SpatRaster 
#> size        : 290250, 462030, 1  (nrow, ncol, nlyr)
#> resolution  : 10, 10  (x, y)
#> extent      : -2356300, 2264000, 270000, 3172500  (xmin, xmax, ymin, ymax)
#> coord. ref. : NAD83 / Conus Albers (EPSG:5070) 

rap_projection("CONUS_IGH", 100)
#> class       : SpatRaster 
#> size        : 33561, 51219, 1  (nrow, ncol, nlyr)
#> resolution  : 100, 100  (x, y)
#> extent      : -13390500, -8268600, 2480600, 5836700  (xmin, xmax, ymin, ymax)
#> coord. ref. : +proj=igh +lon_0=0 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs