Source code for satpy.composites.abi

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2015-2017 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
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# 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
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"""Composite classes for the ABI instrument."""

import logging

from satpy.composites import GenericCompositor

LOG = logging.getLogger(__name__)

[docs]class SimulatedGreen(GenericCompositor): """A single-band dataset resembling a Green (0.55 µm) band. This compositor creates a single band product by combining three other bands in various amounts. The general formula with dependencies (d) and fractions (f) is:: result = d1 * f1 + d2 * f2 + d3 * f3 See the `fractions` keyword argument for more information. Common used fractions for ABI data with C01, C02, and C03 inputs include: - SatPy default (historical): (0.465, 0.465, 0.07) - `CIMSS (Kaba) <>`_: (0.45, 0.45, 0.10) - `EDC <>`_: (0.45706946, 0.48358168, 0.06038137) """ def __init__(self, name, fractions=(0.465, 0.465, 0.07), **kwargs): """Initialize fractions for input channels. Args: name (str): Name of this composite fractions (iterable): Fractions of each input band to include in the result. """ self.fractions = fractions super(SimulatedGreen, self).__init__(name, **kwargs) def __call__(self, projectables, optional_datasets=None, **attrs): """Generate the single band composite.""" c01, c02, c03 = self.match_data_arrays(projectables) res = c01 * self.fractions[0] + c02 * self.fractions[1] + c03 * self.fractions[2] res.attrs = c03.attrs.copy() return super(SimulatedGreen, self).__call__((res,), **attrs)