Internal function to create JPEG or PNG images from a singleband raster file. This function is used by s2_thumbnails, and it will be exported when it would be more generalised.
raster2rgb(
in_rast,
out_file = NULL,
palette = "generic_ndsi_2",
minval = -1,
maxval = 1,
bigtiff = FALSE,
tmpdir = NA
)The path of the output image; alternatively, the output image
as RasterLayer (if out_rast = NULL).
Path of the input multiband raster.
(optional) Path of the output RGB JPEG image; if NULL (default), a RasterLayer will be returned.
Path of the palette file to be used (cpt or txt), or character value of a builtin palette ("SCL", "NDVI", the default "generic_ndsi" or "generic_ndsi_2").
(to be implemented) the value corresponding to the minimum value of the palette (for now, only -1 is used). A quantile will be also accepted.
(to be implemented) the value corresponding to the maximum value of the palette (for now, only 1 is used). A quantile will be also accepted.
(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.
(optional) Path where intermediate files (VRT) will be created.
Default is a temporary directory.
If tmpdir is a non-empty folder, a random subdirectory will be used.
Luigi Ranghetti, phD (2019)
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/.