Read GLASS HDF granules with fill/scale handling — glass

Wraps terra::rast() for GLASS HDF-EOS granules and applies product-level band cleanup in one step:

raw fill values (e.g. 255) set to NA,
the stored scale factor multiplied in,
values outside the valid scaled range set to NA.

When product names a registered variant, fill, scale_factor and valid_range default to the registry values (glass_products); explicit arguments override the registry.

Usage

glass_read(
  input,
  product = NULL,
  fill = NULL,
  scale_factor = NULL,
  valid_range = NULL,
  subds = NULL,
  ...
)

Arguments

input: One or more file paths of the same variant and tile (they become temporal layers of a multi-layer SpatRaster), or an already-open SpatRaster.
product: Optional registry variant key, e.g. "LAI_MODIS_250M".
fill: Optional raw fill value (overrides the registry value).
scale_factor: Optional scale factor.
valid_range: Optional c(min, max) of the scaled data.
subds: Optional sub-dataset selection passed to terra::rast() (needed for multi-band products such as Ta).
...: Passed on to terra::rast().

Value

A cleaned SpatRaster in data units.

Examples

if (FALSE) { # \dontrun{
r <- glass_read("GLASS01D01.V60.A2018217.h28v05.2022013.hdf",
                product = "LAI_MODIS_250M")
} # }