Source code for satpy.demo.seviri_hrit

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2021 Satpy developers
# This file is part of satpy.
# satpy is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
# satpy is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
# You should have received a copy of the GNU General Public License along with
# satpy.  If not, see <>.
"""Demo data download for SEVIRI HRIT files."""

import logging
import os.path

from satpy import config
from satpy.demo.utils import download_url

logger = logging.getLogger(__name__)

FILENAME = "H-000-MSG4__-MSG4________-{channel:_<9s}-{segment:_<9s}-201802281500-__"

[docs]def download_seviri_hrit_20180228_1500(base_dir=None, subset=None): """Download the SEVIRI HRIT files for 2018-02-28T15:00. *subset* is a dictionary with the channels as keys and granules to download as values, eg:: {"HRV": [1, 2, 3], "IR_108": [1, 2], "EPI": None} """ files = generate_subset_of_filenames(subset) base_dir = base_dir or config.get("demo_data_dir", ".") subdir = os.path.join(base_dir, "seviri_hrit", "20180228_1500") os.makedirs(subdir, exist_ok=True) targets = [] for the_file in files: target = os.path.join(subdir, the_file) targets.append(target) if os.path.isfile(target): continue download_url(ZENODO_BASE_URL + the_file, target) return targets
[docs]def generate_subset_of_filenames(subset=None, base_dir=""): """Generate SEVIRI HRIT filenames.""" if subset is None: subset = _create_full_set() pattern = os.path.join(base_dir, FILENAME) files = [] for channel, segments in subset.items(): new_files = _generate_filenames(pattern, channel, segments) files.extend(new_files) return files
def _generate_filenames(pattern, channel, segments): """Generate the filenames for *channel* and *segments*.""" if channel in ["PRO", "EPI"]: new_files = [pattern.format(channel="", segment=channel)] else: new_files = (pattern.format(channel=channel, segment=f"{segment:06d}") for segment in segments) return new_files def _create_full_set(): """Create the full set dictionary.""" subset = {"HRV": range(1, 25), "EPI": None, "PRO": None} channels = ["IR_016", "IR_039", "IR_087", "IR_097", "IR_108", "IR_120", "IR_134", "VIS006", "VIS008", "WV_062", "WV_073"] for channel in channels: subset[channel] = range(1, 9) return subset