alignraster {movegroup}

Combines region-specific group-level UD rasters into a single raster.

Description

Extends the spatial extent of each area-specific group-level raster to the spatial extent shared by all rasters. This will only be required if you have multiple individuals (e.g. different sharks) divided amongst a few discrete areas (e.g. around different islands) and the effort (e.g. receiver coverage) is different among islands. Not required for multiple individuals all within the same region or sampling regime.

Usage

alignraster(
  folderroots = c("/myfolder/H", "/myfolder/L", "/myfolder/M"),
  foldernames = c("H", "L", "M"),
  pattern = ".asc",
  scalefolder = "Scaled",
  scaledweightedname = "All_Rasters_Scaled_Weighted",
  savefolder = tempdir(),
  format = "ascii",
  datatype = "FLT4S",
  bylayer = TRUE,
  overwrite = TRUE,
  returnObj = FALSE
)

Arguments

folderroots

Character vector of locations of folder roots output by movegroup. Function expects CRS.Rds file and a subfolder with the scaled raster.

foldernames

Character vector names of folders corresponding to files in folderroots, i.e. the names of the objects, arrays, regions, etc.

pattern

For input rasters from scaleraster. Default ".asc".

scalefolder

For input rasters from scaleraster. Default "Scaled".

scaledweightedname

For input rasters from scaleraster. Default "All_Rasters_Scaled".

savefolder

E.g. "/myfolder/Aligned". Single character entry of folder to save outputs, no trailing slash.

format

Character. Output file type for raster::writeRaster param format. Default ascii, other options have generally not worked well in SD's experience.

datatype

Character. Data type for writing values to disk for raster::writeRaster param datatype. Default FLT4S.

bylayer

For raster::writeRaster param bylayer. Default TRUE.

overwrite

For raster::writeRaster param overwrite. Default TRUE.

returnObj

Logical. Return the scaled object to the parent environment to be assigned as an object? Default FALSE.

Details

When used in a movegroup pipeline, the order would be: movegroup.R, scaleraster.R, alignraster.R if required, plotraster.R.

Value

Region-specific group-level UD rasters that share the same spatial extent.

Author(s)

Simon Dedman, [e-mail]

Maurits van Zinnicq Bergmann, [e-mail]

Examples

# load data
data("TracksCleaned")
# loop movegroup and scaleraster through tide subsets
tide <- c("H", "M", "L")
for (i in tide) {
dir.create(file.path(tempdir(), i))
  movegroup(
    data = TracksCleaned[TracksCleaned$T.Ph == i, ],
    ID = "Shark",
    Datetime = "Datetime",
    Lat = "Lat",
    Lon = "Lon",
    savedir = file.path(tempdir(), i, "/"))
  
  scaleraster(path = file.path(tempdir(), i),
              crsloc = file.path(tempdir(), i))
}

alignraster(folderroots = file.path(tempdir(), tide),
            foldernames = tide,
            savefolder = file.path(tempdir(), "Aligned"))