#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2011-2015 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 <http://www.gnu.org/licenses/>.
"""Interface to OMPS EDR format."""
import logging
from datetime import datetime, timedelta
import numpy as np
from satpy.readers.hdf5_utils import HDF5FileHandler
NO_DATE = datetime(1958, 1, 1)
EPSILON_TIME = timedelta(days=2)
LOG = logging.getLogger(__name__)
[docs]class EDRFileHandler(HDF5FileHandler):
"""EDR file handler."""
_fill_name = "_FillValue"
@property
def start_orbit_number(self):
"""Get the start orbit number."""
return self.filename_info['orbit']
@property
def end_orbit_number(self):
"""Get the end orbit number."""
return self.filename_info['orbit']
@property
def platform_name(self):
"""Get the platform name."""
return self.filename_info['platform_shortname']
@property
def sensor_name(self):
"""Get the sensor name."""
return self.filename_info['instrument_shortname']
[docs] def get_shape(self, ds_id, ds_info):
"""Get the shape."""
return self[ds_info['file_key'] + '/shape']
[docs] def adjust_scaling_factors(self, factors, file_units, output_units):
"""Adjust scaling factors."""
if factors is None or factors[0] is None:
factors = [1, 0]
if file_units == output_units:
LOG.debug("File units and output units are the same (%s)", file_units)
return factors
return np.array(factors)
[docs] def get_dataset(self, dataset_id, ds_info):
"""Get the dataset."""
var_path = ds_info.get('file_key', '{}'.format(dataset_id['name']))
metadata = self.get_metadata(dataset_id, ds_info)
valid_min, valid_max = self.get(var_path + '/attr/valid_range',
self.get(var_path + '/attr/ValidRange', (None, None)))
if valid_min is None or valid_max is None:
valid_min = self.get(var_path + '/attr/valid_min', None)
valid_max = self.get(var_path + '/attr/valid_max', None)
if valid_min is None or valid_max is None:
raise KeyError("File variable '{}' has no valid range attribute".format(var_path))
fill_name = var_path + '/attr/{}'.format(self._fill_name)
if fill_name in self:
fill_value = self[fill_name]
else:
fill_value = None
data = self[var_path]
scale_factor_path = var_path + '/attr/ScaleFactor'
if scale_factor_path in self:
scale_factor = self[scale_factor_path]
scale_offset = self[var_path + '/attr/Offset']
else:
scale_factor = None
scale_offset = None
if valid_min is not None and valid_max is not None:
# the original .cfg/INI based reader only checked valid_max
data = data.where((data <= valid_max) & (data >= valid_min))
if fill_value is not None:
data = data.where(data != fill_value)
factors = (scale_factor, scale_offset)
factors = self.adjust_scaling_factors(factors, metadata['file_units'], ds_info.get("units"))
if factors[0] != 1 or factors[1] != 0:
data = data * factors[0] + factors[1]
data.attrs.update(metadata)
if 'DIMENSION_LIST' in data.attrs:
data.attrs.pop('DIMENSION_LIST')
dimensions = self.get_reference(var_path, 'DIMENSION_LIST')
for dim, coord in zip(data.dims, dimensions):
data.coords[dim] = coord[0]
return data
[docs]class EDREOSFileHandler(EDRFileHandler):
"""EDR EOS file handler."""
_fill_name = "MissingValue"