createComparableCDL: Create comparable raster images

In cdlTools: Tools to Download and Work with USDA Cropscape Data

Create comparable raster images

Description

createComparableCDL uses a base index within a raster list, and sets all other raster images within the list to the same resolution, projection, and extent. The raster function resample is used to transform raster images, therefore this function may be quite slow without tuning.

Usage

createComparableCDL(
  rasterList,
  filenames,
  baseIndex = 1,
  progress = "",
  threads = FALSE
)

Arguments

rasterList	A list of raster images.
filenames	An array of file names of raster images to coerce into a raster list, if rasterList is not provided.
baseIndex	The index of the raster list element that all other elements will match with respect to resolution, projection and extent (default = 1).
progress	A string for the raster progress bar type, default "" is none, "text" provides text output, "window" provides a gui window if available. Not available for terra.
threads	(terra only) passes the thread parameter to Terra (default = FALSE).

Value

A list of raster images matching in extent, resolution, and projection.

Author(s)

Jonathan Lisic, [e-mail]

Examples

## Not run: 
# download multiple years of Iowa Data

# for raster
r <- getCDL('iowa',c(2006,2010))
# resample based on the 2006
r2 <- createComparableCDL(r,baseIndex=1)

# for terra (note it will just reload what was already downloaded)
r_terra <- getCDL('iowa',c(2006,2010), returnType = 'terra') 
# resample based on the 2006
r_terra2 <- createComparableCDL(r_terra,baseIndex=1)

## End(Not run)

cdlTools documentation built on May 29, 2024, 2:13 a.m.