load scale and offset if present

This Merge request adds the functionality to automatically load the scale and offset values from the input datasets into the STAC Metadata directly without having the user enter them manually, if present in the datasets.

However, if these values are not present or are incorrectly written in the data metadata, the user can use the write_scale_and_offset.py script to enter the values to the datasets and Raster2STAC should be able to read the correct values directly into the metadata afterwards.

raster2stac/write_scale_and_offset.py

-"""
-Writes Scale factor and Offset values to raster data (Tiff or NetCDF data formats)
-and save them to the file metadata profile
-Created on: 06-05-2024
-Last update:
-@author: Rufai Omowunmi Balogun
-"""
-
-import sys
-import logging
-import argparse
-
-import rioxarray
-import xarray as xr
-
-
-logger = logging.getLogger(__name__)
-logger.setLevel(logging.INFO)
-formatter = logging.Formatter("%(asctime)s [%(levelname)s] %(message)s")
-stream_handler = logging.StreamHandler(sys.stdout)
-stream_handler.setFormatter(formatter)
-logger.addHandler(stream_handler)
-
-
-def add_scale_and_offset(
-    data_path: str, scale_factor: float = 1.0, offset: float = 0.0, tiff: bool = True
-):
-    """write and save scale and offset values to datasets
-
-    Args:
-        data_path (str): path to the dataset
-        scale_factor (float, optional): integer value of the scale_factor. Defaults to 1.0.
-        offset (float, optional): integer value of the offset. Defaults to 0.0.
-        tiff (bool, optional): Boolean if the dataset is in a TIFF format or not. Defaults to True.
-    """
-    if tiff:
-        rio_ds = rioxarray.open_rasterio(data_path)
-        rio_ds.attrs["scale_factor"] = scale_factor
-        rio_ds.attrs["offset"] = offset
-
-        # save the scale and offset to data
-        rio_ds.rio.to_raster(data_path)
-    else:
-        xds = xr.open_dataset(data_path)
-        xds.attrs["scale_factor"] = scale_factor
-        xds.attrs["offset"] = offset
-        # save scale and offset to data
-        xds.to_netcdf(data_path)
-
-
-if __name__ == "__main__":
-    parser = argparse.ArgumentParser(
-        description="Write Scale factor \
-                                     and Offset values directly to raster \
-                                     datasets (TIFF file formats and NetCDFs) "
-    )
-
-    parser.add_argument(
-        "data_path", type=str, help="path to the tiff or netcdf dataset"
-    )
-    parser.add_argument(
-        "scale_factor",
-        type=float,
-        help="integer value of the scale_factor. \
-                         Defaults to 1.0.",
-    )
-    parser.add_argument(
-        "offset",
-        type=float,
-        help="integer value of the offset.\
-                         Defaults to 0.0.",
-    )
-    parser.add_argument(
-        "tiff",
-        type=bool,
-        help="Boolean if the dataset is in \
-                        a TIFF format or not. Defaults to True",
-    )
-
-    args = parser.parse_args()
-    add_scale_and_offset(args.data_path, args.scale_factor, args.offset, args.tiff)