s2_thumbnails: Create thumbnails for S2 products.
In pobsteta/theia2r: An R toolbox to find, download and preprocess Sentinel-2 data

Description Usage Arguments Value Note Author(s)

Function to create thumbnail images for Sentinel-2 products. BOA and TOA multiband images are rendered as false colour JPEG images; SCL maps are rendered as 8-bit PNG; other singleband images (like spectral indices) are rendered as JPEG images with a standard colour palette. Output images are georeferenced.

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s2_thumbnails(infiles, prod_type = NA, rgb_type = "SwirNirR",
  dim = 1024, scaleRange = NA, outdir = NA, tmpdir = NA,
  rmtmp = TRUE, overwrite = FALSE)

`infiles`	A vector of input filenames. Input files are paths of products already converted from SAFE format to a format managed by GDAL (use s2_translate to do it); their names must be in the theia2r naming convention (safe_shortname).
`prod_type`	(optional) Output product (see safe_shortname for the list of accepted products). If not provided, it is retrieved from the file name.
`rgb_type`	(optional) For BOA and TOA products, this value determine the type of false colours to be used for the thumbnails: `"SwirNirR"` (default) for SWIR-NIR-Red; `"NirRG"` for NIR-Red-Green; `"RGB"` for true colours;
`dim`	Integer value, with the maximum greater dimension in pixels (width or height) of the output images (default: 1024 px). If this is lower than the corresponding dimension of the maps, maps are rescaled before producing the thumbnails; otherwise the original dimensions are maintained. To keep the original size in any case, set `dim = Inf`.
`scaleRange`	(optional) Range of valid values. If not specified (default), it is automatically retrieved from the product type. Default ranges for BOA and TOA products are 0 to 8000 (`rgb_type = "SwirNirR"`), 0 to 7500 (`"NirRG"`) and 0 to 2500 (`"RGB"`). For spectral indices, default range is -1 to 1 for Float products, -10000 to 10000 for Int and 0 to 200 for Byte; for "Zscore" products, default range is -3 to 3 for Float and -3000 to 3000 for Int. It can be useful i.e. to stretch BOA "dark" products.
`outdir`	(optional) Full name of the existing output directory where the files should be created. Default is a subdirectory (named "thumbnails") of the parent directory of each input file.
`tmpdir`	(optional) Path where intermediate files (VRT) will be created. Default is a temporary directory.
`rmtmp`	(optional) Logical: should temporary files be removed? (Default: TRUE)
`overwrite`	(optional) Logical value: should existing thumbnails be overwritten? (default: TRUE)