satpy.readers.nwcsaf_hrw_nc module

NWC SAF GEO v2021 HRW.

This module contains the NWCSAFGEOHRWFileHandler file handler for the High Resolution Winds (HRW) data produced with NWC SAF GEO.

There are 37 different quantities in the files, and predicted trajectories for each observation. Reading of the trajectory data are not currently supported.

The data in the files are grouped separately for each original imaging channel, which there are up to seven. The number of channels depends on the configuration of NWC SAF GEO software.

By default the reader treats each imaging channel separately, and thus lists 7 (channels) * 37 (variables) = 259 distinct datasets:

import pprint
from satpy import Scene

filename = "S_NWC_HRW_MSG3_MSG-N-BS_20250206T130000Z.nc"
scn = Scene(reader="nwcsaf-geo", filenames=[filename])
pprint.pprint(scn.available_dataset_names())

This prints all the available datasets. The truncated output of this is:

['wind_hrvis_air_pressure',
 'wind_hrvis_air_pressure_correction',
 'wind_hrvis_air_pressure_error',
 'wind_hrvis_air_pressure_nwp_at_best_fit_level',
 'wind_hrvis_air_temperature',
 ...
 'wind_wv073_wind_speed',
 'wind_wv073_wind_speed_difference_nwp_at_amv_level',
 'wind_wv073_wind_speed_difference_nwp_at_best_fit_level',
 'wind_wv073_wind_speed_nwp_at_amv_level',
 'wind_wv073_wind_speed_nwp_at_best_fit_level']

The channel name is used as a prefix for the datasets.

It is also possible to merge all of these channel-by-channel datasets with a reader key-word argument:

scn = Scene(reader="nwcsaf-geo", filenames=[filename], reader_kwargs={"merge_channels": True})
pprint.pprint(scn.available_dataset_names())

Full list of the printed datasets is:

['air_pressure',
 'air_pressure_correction',
 'air_pressure_error',
 'air_pressure_nwp_at_best_fit_level',
 'air_temperature',
 'cloud_type',
 'correlation',
 'correlation_test',
 'height_assignment_method',
 'latitude',
 'latitude_increment',
 'longitude',
 'longitude_increment',
 'number_of_winds',
 'orographic_index',
 'previous_wind_idx',
 'quality_index_iwwg_value',
 'quality_index_with_forecast',
 'quality_index_without_forecast',
 'quality_test',
 'segment_x',
 'segment_x_pix',
 'segment_y',
 'segment_y_pix',
 'tracer_correlation_method',
 'tracer_type',
 'wind_from_direction',
 'wind_from_direction_difference_nwp_at_amv_level',
 'wind_from_direction_difference_nwp_at_best_fit_level',
 'wind_from_direction_nwp_at_amv_level',
 'wind_from_direction_nwp_at_best_fit_level',
 'wind_idx',
 'wind_speed',
 'wind_speed_difference_nwp_at_amv_level',
 'wind_speed_difference_nwp_at_best_fit_level',
 'wind_speed_nwp_at_amv_level',
 'wind_speed_nwp_at_best_fit_level']

class satpy.readers.nwcsaf_hrw_nc.NWCSAFGEOHRWFileHandler(filename, filename_info, filetype_info, merge_channels=False)

Bases: BaseFileHandler

A file handler class for NWC SAF GEO HRW files.

Initialize the file handler.

__init__(filename, filename_info, filetype_info, merge_channels=False)

Initialize the file handler.

_append_merged_coordinates(channel)

_create_xarray(data, dataset_name, units, channel)

_get_channel_prefix(channel)

_measurand_ds_info(prefix, measurand)

_read_channel_coordinates(channel)

_read_dataset(dataset_key)

Read a dataset.

_read_merged_dataset(dataset_key)

Read a dataset merged from every channel.

available_datasets(configured_datasets=None)

Form the names for the available datasets.

property end_time

Get the end time.

get_dataset(key, info)

Load a dataset.

property start_time

Get the start time.