rap_projection: Select Projection System for RAP Extent

In rapr: Interface to 'Rangeland Analysis Platform' (RAP) Products

Select Projection System for RAP Extent

Description

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.

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"

Value

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

See Also

get_rap()

Examples

rap_projection("CONUS_AEA", 10)

rap_projection("CONUS_IGH", 100)

rapr documentation built on Nov. 15, 2025, 1:08 a.m.