calcindex_raster: Compute index using `raster` or `stars` features

Description

Internal functions used to compute spectral indices and thumbnails through raster or stars features.

Usage

calcindex_raster(
  x,
  sel_formula,
  out_file,
  NAflag = -32768,
  sel_format = "GTiff",
  compress = "LZW",
  datatype = "Int32",
  bigtiff = FALSE,
  overwrite = FALSE,
  minrows = NULL
)
calcindex_stars(
  x,
  sel_formula,
  out_file,
  NAflag = -32768,
  sel_format = "GTiff",
  compress = "LZW",
  datatype = "Int16",
  bigtiff = FALSE,
  overwrite = FALSE
)

Value

NULL (the function is called for its side effects)

Arguments

x: Input file path, or RasterLayer (in calcindex_raster()) or stars (in calcindex_stars()).
sel_formula: Formula used to compute output raster (specific formats are used - documentation will be improved).
out_file: Output file path.
NAflag: (optional)
sel_format: (optional) Format of the output file (in a format recognised by GDAL). Default "GTiff".
compress: (optional) In the case a GTiff format is present, the compression indicated with this parameter is used.
datatype: (optional) Numeric datatype of the output rasters (see s2_calcindices()).
bigtiff: (optional) Logical: if TRUE, the creation of a BigTIFF is forced (default is FALSE). This option is used only in the case a GTiff format was chosen.
overwrite: Logical value: should existing output files be overwritten? (default: FALSE)
minrows: (optional) parameter passed to blockSize().

Author

Luigi Ranghetti, phD (2020)

References

L. Ranghetti, M. Boschetti, F. Nutini, L. Busetto (2020). "sen2r": An R toolbox for automatically downloading and preprocessing Sentinel-2 satellite data. Computers & Geosciences, 139, 104473. tools:::Rd_expr_doi("10.1016/j.cageo.2020.104473"), URL: https://sen2r.ranghetti.info/.