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__init__.py
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__init__.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2015-2020 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/>.
"""Base classes for composite objects."""
import logging
import os
import warnings
import dask.array as da
import numpy as np
import xarray as xr
from satpy.config import get_environ_ancpath
from satpy.dataset import DataID, combine_metadata
from satpy.dataset.dataid import minimal_default_keys_config
from satpy.writers import get_enhanced_image
LOG = logging.getLogger(__name__)
NEGLIBLE_COORDS = ['time']
"""Keywords identifying non-dimensional coordinates to be ignored during composite generation."""
MASKING_COMPOSITOR_METHODS = ['less', 'less_equal', 'equal', 'greater_equal',
'greater', 'not_equal', 'isnan', 'isfinite',
'isneginf', 'isposinf']
class IncompatibleAreas(Exception):
"""Error raised upon compositing things of different shapes."""
pass
class IncompatibleTimes(Exception):
"""Error raised upon compositing things from different times."""
pass
def check_times(projectables):
"""Check that *projectables* have compatible times."""
times = []
for proj in projectables:
try:
if proj['time'].size and proj['time'][0] != 0:
times.append(proj['time'][0].values)
else:
break # right?
except KeyError:
# the datasets don't have times
break
except IndexError:
# time is a scalar
if proj['time'].values != 0:
times.append(proj['time'].values)
else:
break
else:
# Is there a more gracious way to handle this ?
if np.max(times) - np.min(times) > np.timedelta64(1, 's'):
raise IncompatibleTimes
else:
mid_time = (np.max(times) - np.min(times)) / 2 + np.min(times)
return mid_time
def sub_arrays(proj1, proj2):
"""Substract two DataArrays and combine their attrs."""
attrs = combine_metadata(proj1.attrs, proj2.attrs)
if (attrs.get('area') is None
and proj1.attrs.get('area') is not None
and proj2.attrs.get('area') is not None):
raise IncompatibleAreas
res = proj1 - proj2
res.attrs = attrs
return res
class CompositeBase:
"""Base class for all compositors.
A compositor in Satpy is a class that takes in zero or more input
DataArrays and produces a new DataArray with its own identifier (name).
The result of a compositor is typically a brand new "product" that
represents something different than the inputs that went into the
operation.
See the :class:`~satpy.composites.ModifierBase` class for information
on the similar concept of "modifiers".
"""
def __init__(self, name, prerequisites=None, optional_prerequisites=None, **kwargs):
"""Initialise the compositor."""
# Required info
kwargs["name"] = name
kwargs["prerequisites"] = prerequisites or []
kwargs["optional_prerequisites"] = optional_prerequisites or []
self.attrs = kwargs
@property
def id(self):
"""Return the DataID of the object."""
try:
return self.attrs['_satpy_id']
except KeyError:
id_keys = self.attrs.get('_satpy_id_keys', minimal_default_keys_config)
return DataID(id_keys, **self.attrs)
def __call__(self, datasets, optional_datasets=None, **info):
"""Generate a composite."""
raise NotImplementedError()
def __str__(self):
"""Stringify the object."""
from pprint import pformat
return pformat(self.attrs)
def __repr__(self):
"""Represent the object."""
from pprint import pformat
return pformat(self.attrs)
def apply_modifier_info(self, origin, destination):
"""Apply the modifier info from *origin* to *destination*."""
o = getattr(origin, 'attrs', origin)
d = getattr(destination, 'attrs', destination)
try:
dataset_keys = self.attrs['_satpy_id'].id_keys.keys()
except KeyError:
dataset_keys = ['name', 'modifiers']
for k in dataset_keys:
if k == 'modifiers' and k in self.attrs:
d[k] = self.attrs[k]
elif d.get(k) is None:
if self.attrs.get(k) is not None:
d[k] = self.attrs[k]
elif o.get(k) is not None:
d[k] = o[k]
def match_data_arrays(self, data_arrays):
"""Match data arrays so that they can be used together in a composite."""
self.check_geolocation(data_arrays)
return self.drop_coordinates(data_arrays)
def drop_coordinates(self, data_arrays):
"""Drop neglible non-dimensional coordinates."""
new_arrays = []
for ds in data_arrays:
drop = [coord for coord in ds.coords
if coord not in ds.dims and any([neglible in coord for neglible in NEGLIBLE_COORDS])]
if drop:
new_arrays.append(ds.drop(drop))
else:
new_arrays.append(ds)
return new_arrays
def check_geolocation(self, data_arrays):
"""Check that the geolocations of the *data_arrays* are compatible."""
if len(data_arrays) == 1:
return
if 'x' in data_arrays[0].dims and \
not all(x.sizes['x'] == data_arrays[0].sizes['x']
for x in data_arrays[1:]):
raise IncompatibleAreas("X dimension has different sizes")
if 'y' in data_arrays[0].dims and \
not all(x.sizes['y'] == data_arrays[0].sizes['y']
for x in data_arrays[1:]):
raise IncompatibleAreas("Y dimension has different sizes")
areas = [ds.attrs.get('area') for ds in data_arrays]
if all(a is None for a in areas):
return
elif any(a is None for a in areas):
raise ValueError("Missing 'area' attribute")
if not all(areas[0] == x for x in areas[1:]):
LOG.debug("Not all areas are the same in "
"'{}'".format(self.attrs['name']))
raise IncompatibleAreas("Areas are different")
def check_areas(self, data_arrays):
"""Check that the areas of the *data_arrays* are compatible."""
warnings.warn('satpy.composites.CompositeBase.check_areas is deprecated, use '
'satpy.composites.CompositeBase.match_data_arrays instead')
return self.match_data_arrays(data_arrays)
class DifferenceCompositor(CompositeBase):
"""Make the difference of two data arrays."""
def __call__(self, projectables, nonprojectables=None, **info):
"""Generate the composite."""
if len(projectables) != 2:
raise ValueError("Expected 2 datasets, got %d" % (len(projectables),))
projectables = self.match_data_arrays(projectables)
info = combine_metadata(*projectables)
info['name'] = self.attrs['name']
proj = projectables[0] - projectables[1]
proj.attrs = info
return proj
class SingleBandCompositor(CompositeBase):
"""Basic single-band composite builder.
This preserves all the attributes of the dataset it is derived from.
"""
def __call__(self, projectables, nonprojectables=None, **attrs):
"""Build the composite."""
if len(projectables) != 1:
raise ValueError("Can't have more than one band in a single-band composite")
data = projectables[0]
new_attrs = data.attrs.copy()
new_attrs.update({key: val
for (key, val) in attrs.items()
if val is not None})
resolution = new_attrs.get('resolution', None)
new_attrs.update(self.attrs)
if resolution is not None:
new_attrs['resolution'] = resolution
return xr.DataArray(data=data.data, attrs=new_attrs,
dims=data.dims, coords=data.coords)
class GenericCompositor(CompositeBase):
"""Basic colored composite builder."""
modes = {1: 'L', 2: 'LA', 3: 'RGB', 4: 'RGBA'}
def __init__(self, name, common_channel_mask=True, **kwargs):
"""Collect custom configuration values.
Args:
common_channel_mask (bool): If True, mask all the channels with
a mask that combines all the invalid areas of the given data.
"""
self.common_channel_mask = common_channel_mask
super(GenericCompositor, self).__init__(name, **kwargs)
@classmethod
def infer_mode(cls, data_arr):
"""Guess at the mode for a particular DataArray."""
if 'mode' in data_arr.attrs:
return data_arr.attrs['mode']
if 'bands' not in data_arr.dims:
return cls.modes[1]
if 'bands' in data_arr.coords and isinstance(data_arr.coords['bands'][0].item(), str):
return ''.join(data_arr.coords['bands'].values)
return cls.modes[data_arr.sizes['bands']]
def _concat_datasets(self, projectables, mode):
try:
data = xr.concat(projectables, 'bands', coords='minimal')
data['bands'] = list(mode)
except ValueError as e:
LOG.debug("Original exception for incompatible areas: {}".format(str(e)))
raise IncompatibleAreas
return data
def _get_sensors(self, projectables):
sensor = set()
for projectable in projectables:
current_sensor = projectable.attrs.get("sensor", None)
if current_sensor:
if isinstance(current_sensor, (str, bytes)):
sensor.add(current_sensor)
else:
sensor |= current_sensor
if len(sensor) == 0:
sensor = None
elif len(sensor) == 1:
sensor = list(sensor)[0]
return sensor
def __call__(self, projectables, nonprojectables=None, **attrs):
"""Build the composite."""
num = len(projectables)
mode = attrs.get('mode')
if mode is None:
# num may not be in `self.modes` so only check if we need to
mode = self.modes[num]
if len(projectables) > 1:
projectables = self.match_data_arrays(projectables)
data = self._concat_datasets(projectables, mode)
# Skip masking if user wants it or a specific alpha channel is given.
if self.common_channel_mask and mode[-1] != 'A':
data = data.where(data.notnull().all(dim='bands'))
else:
data = projectables[0]
# if inputs have a time coordinate that may differ slightly between
# themselves then find the mid time and use that as the single
# time coordinate value
if len(projectables) > 1:
time = check_times(projectables)
if time is not None and 'time' in data.dims:
data['time'] = [time]
new_attrs = combine_metadata(*projectables)
# remove metadata that shouldn't make sense in a composite
new_attrs["wavelength"] = None
new_attrs.pop("units", None)
new_attrs.pop('calibration', None)
new_attrs.pop('modifiers', None)
new_attrs.update({key: val
for (key, val) in attrs.items()
if val is not None})
resolution = new_attrs.get('resolution', None)
new_attrs.update(self.attrs)
if resolution is not None:
new_attrs['resolution'] = resolution
new_attrs["sensor"] = self._get_sensors(projectables)
new_attrs["mode"] = mode
return xr.DataArray(data=data.data, attrs=new_attrs,
dims=data.dims, coords=data.coords)
class FillingCompositor(GenericCompositor):
"""Make a regular RGB, filling the RGB bands with the first provided dataset's values."""
def __call__(self, projectables, nonprojectables=None, **info):
"""Generate the composite."""
projectables = self.match_data_arrays(projectables)
projectables[1] = projectables[1].fillna(projectables[0])
projectables[2] = projectables[2].fillna(projectables[0])
projectables[3] = projectables[3].fillna(projectables[0])
return super(FillingCompositor, self).__call__(projectables[1:], **info)
class Filler(GenericCompositor):
"""Fix holes in projectable 1 with data from projectable 2."""
def __call__(self, projectables, nonprojectables=None, **info):
"""Generate the composite."""
projectables = self.match_data_arrays(projectables)
filled_projectable = projectables[0].fillna(projectables[1])
return super(Filler, self).__call__([filled_projectable], **info)
class RGBCompositor(GenericCompositor):
"""Make a composite from three color bands (deprecated)."""
def __call__(self, projectables, nonprojectables=None, **info):
"""Generate the composite."""
warnings.warn("RGBCompositor is deprecated, use GenericCompositor instead.", DeprecationWarning)
if len(projectables) != 3:
raise ValueError("Expected 3 datasets, got %d" % (len(projectables),))
return super(RGBCompositor, self).__call__(projectables, **info)
class ColormapCompositor(GenericCompositor):
"""A compositor that uses colormaps."""
@staticmethod
def build_colormap(palette, dtype, info):
"""Create the colormap from the `raw_palette` and the valid_range.
Colormaps come in different forms, but they are all supposed to have
color values between 0 and 255. The following cases are considered:
- Palettes comprised of only a list on colors. If *dtype* is uint8,
the values of the colormap are the enumaration of the colors.
Otherwise, the colormap values will be spread evenly from the min
to the max of the valid_range provided in `info`.
- Palettes that have a palette_meanings attribute. The palette meanings
will be used as values of the colormap.
"""
from trollimage.colormap import Colormap
squeezed_palette = np.asanyarray(palette).squeeze() / 255.0
set_range = True
if hasattr(palette, 'attrs') and 'palette_meanings' in palette.attrs:
set_range = False
meanings = palette.attrs['palette_meanings']
iterator = zip(meanings, squeezed_palette)
else:
iterator = enumerate(squeezed_palette[:-1])
if dtype == np.dtype('uint8'):
tups = [(val, tuple(tup))
for (val, tup) in iterator]
colormap = Colormap(*tups)
elif 'valid_range' in info:
tups = [(val, tuple(tup))
for (val, tup) in iterator]
colormap = Colormap(*tups)
if set_range:
sf = info.get('scale_factor', np.array(1))
colormap.set_range(
*(np.array(info['valid_range']) * sf
+ info.get('add_offset', 0)))
else:
raise AttributeError("Data needs to have either a valid_range or be of type uint8" +
" in order to be displayable with an attached color-palette!")
return colormap, squeezed_palette
def __call__(self, projectables, **info):
"""Generate the composite."""
if len(projectables) != 2:
raise ValueError("Expected 2 datasets, got %d" %
(len(projectables), ))
data, palette = projectables
colormap, palette = self.build_colormap(palette, data.dtype, data.attrs)
channels = self._apply_colormap(colormap, data, palette)
return self._create_composite_from_channels(channels, data)
def _create_composite_from_channels(self, channels, template):
mask = self._get_mask_from_data(template)
channels = [self._create_masked_dataarray_like(channel, template, mask) for channel in channels]
res = super(ColormapCompositor, self).__call__(channels, **template.attrs)
res.attrs['_FillValue'] = np.nan
return res
@staticmethod
def _get_mask_from_data(data):
fill_value = data.attrs.get('_FillValue', np.nan)
if np.isnan(fill_value):
mask = data.notnull()
else:
mask = data != data.attrs['_FillValue']
return mask
@staticmethod
def _create_masked_dataarray_like(array, template, mask):
return xr.DataArray(array.reshape(template.shape),
dims=template.dims, coords=template.coords,
attrs=template.attrs).where(mask)
class ColorizeCompositor(ColormapCompositor):
"""A compositor colorizing the data, interpolating the palette colors when needed."""
@staticmethod
def _apply_colormap(colormap, data, palette):
del palette
return colormap.colorize(data.data.squeeze())
class PaletteCompositor(ColormapCompositor):
"""A compositor colorizing the data, not interpolating the palette colors."""
@staticmethod
def _apply_colormap(colormap, data, palette):
channels, colors = colormap.palettize(data.data.squeeze())
channels = channels.map_blocks(_insert_palette_colors, palette, dtype=palette.dtype,
new_axis=2, chunks=list(channels.chunks) + [palette.shape[1]])
return [channels[:, :, i] for i in range(channels.shape[2])]
def _insert_palette_colors(channels, palette):
channels = palette[channels]
return channels
class DayNightCompositor(GenericCompositor):
"""A compositor that blends a day data with night data."""
def __init__(self, name, lim_low=85., lim_high=88., **kwargs):
"""Collect custom configuration values.
Args:
lim_low (float): lower limit of Sun zenith angle for the
blending of the given channels
lim_high (float): upper limit of Sun zenith angle for the
blending of the given channels
"""
self.lim_low = lim_low
self.lim_high = lim_high
super(DayNightCompositor, self).__init__(name, **kwargs)
def __call__(self, projectables, **kwargs):
"""Generate the composite."""
projectables = self.match_data_arrays(projectables)
day_data = projectables[0]
night_data = projectables[1]
lim_low = np.cos(np.deg2rad(self.lim_low))
lim_high = np.cos(np.deg2rad(self.lim_high))
try:
coszen = np.cos(np.deg2rad(projectables[2]))
except IndexError:
from pyorbital.astronomy import cos_zen
LOG.debug("Computing sun zenith angles.")
# Get chunking that matches the data
try:
chunks = day_data.sel(bands=day_data['bands'][0]).chunks
except KeyError:
chunks = day_data.chunks
lons, lats = day_data.attrs["area"].get_lonlats(chunks=chunks)
coszen = xr.DataArray(cos_zen(day_data.attrs["start_time"],
lons, lats),
dims=['y', 'x'],
coords=[day_data['y'], day_data['x']])
# Calculate blending weights
coszen -= np.min((lim_high, lim_low))
coszen /= np.abs(lim_low - lim_high)
coszen = coszen.clip(0, 1)
# Apply enhancements to get images
day_data = enhance2dataset(day_data)
night_data = enhance2dataset(night_data)
# Adjust bands so that they match
# L/RGB -> RGB/RGB
# LA/RGB -> RGBA/RGBA
# RGB/RGBA -> RGBA/RGBA
day_data = add_bands(day_data, night_data['bands'])
night_data = add_bands(night_data, day_data['bands'])
# Replace missing channel data with zeros
day_data = zero_missing_data(day_data, night_data)
night_data = zero_missing_data(night_data, day_data)
# Get merged metadata
attrs = combine_metadata(day_data, night_data)
# Blend the two images together
data = (1 - coszen) * night_data + coszen * day_data
data.attrs = attrs
# Split to separate bands so the mode is correct
data = [data.sel(bands=b) for b in data['bands']]
return super(DayNightCompositor, self).__call__(data, **kwargs)
def enhance2dataset(dset, convert_p=False):
"""Return the enhancement dataset *dset* as an array.
If `convert_p` is True, enhancements generating a P mode will be converted to RGB or RGBA.
"""
attrs = dset.attrs
data = _get_data_from_enhanced_image(dset, convert_p)
data.attrs = attrs
# remove 'mode' if it is specified since it may have been updated
data.attrs.pop('mode', None)
# update mode since it may have changed (colorized/palettize)
data.attrs['mode'] = GenericCompositor.infer_mode(data)
return data
def _get_data_from_enhanced_image(dset, convert_p):
img = get_enhanced_image(dset)
if convert_p and img.mode == 'P':
img = _apply_palette_to_image(img)
if img.mode != 'P':
data = img.data.clip(0.0, 1.0)
else:
data = img.data
return data
def _apply_palette_to_image(img):
if len(img.palette[0]) == 3:
img = img.convert('RGB')
elif len(img.palette[0]) == 4:
img = img.convert('RGBA')
return img
def add_bands(data, bands):
"""Add bands so that they match *bands*."""
# Add R, G and B bands, remove L band
bands = bands.compute()
if 'P' in data['bands'].data or 'P' in bands.data:
raise NotImplementedError('Cannot mix datasets of mode P with other datasets at the moment.')
if 'L' in data['bands'].data and 'R' in bands.data:
lum = data.sel(bands='L')
# Keep 'A' if it was present
if 'A' in data['bands']:
alpha = data.sel(bands='A')
new_data = (lum, lum, lum, alpha)
new_bands = ['R', 'G', 'B', 'A']
mode = 'RGBA'
else:
new_data = (lum, lum, lum)
new_bands = ['R', 'G', 'B']
mode = 'RGB'
data = xr.concat(new_data, dim='bands', coords={'bands': new_bands})
data['bands'] = new_bands
data.attrs['mode'] = mode
# Add alpha band
if 'A' not in data['bands'].data and 'A' in bands.data:
new_data = [data.sel(bands=band) for band in data['bands'].data]
# Create alpha band based on a copy of the first "real" band
alpha = new_data[0].copy()
alpha.data = da.ones((data.sizes['y'],
data.sizes['x']),
chunks=new_data[0].chunks)
# Rename band to indicate it's alpha
alpha['bands'] = 'A'
new_data.append(alpha)
new_data = xr.concat(new_data, dim='bands')
new_data.attrs['mode'] = data.attrs['mode'] + 'A'
data = new_data
return data
def zero_missing_data(data1, data2):
"""Replace NaN values with zeros in data1 if the data is valid in data2."""
nans = np.logical_and(np.isnan(data1), np.logical_not(np.isnan(data2)))
return data1.where(~nans, 0)
class RealisticColors(GenericCompositor):
"""Create a realistic colours composite for SEVIRI."""
def __call__(self, projectables, *args, **kwargs):
"""Generate the composite."""
projectables = self.match_data_arrays(projectables)
vis06 = projectables[0]
vis08 = projectables[1]
hrv = projectables[2]
try:
ch3 = 3 * hrv - vis06 - vis08
ch3.attrs = hrv.attrs
except ValueError:
raise IncompatibleAreas
ndvi = (vis08 - vis06) / (vis08 + vis06)
ndvi = np.where(ndvi < 0, 0, ndvi)
ch1 = ndvi * vis06 + (1 - ndvi) * vis08
ch1.attrs = vis06.attrs
ch2 = ndvi * vis08 + (1 - ndvi) * vis06
ch2.attrs = vis08.attrs
res = super(RealisticColors, self).__call__((ch1, ch2, ch3),
*args, **kwargs)
return res
class CloudCompositor(GenericCompositor):
"""Detect clouds based on thresholding and use it as a mask for compositing."""
def __init__(self, name, transition_min=258.15, transition_max=298.15,
transition_gamma=3.0, **kwargs):
"""Collect custom configuration values.
Args:
transition_min (float): Values below or equal to this are
clouds -> opaque white
transition_max (float): Values above this are
cloud free -> transparent
transition_gamma (float): Gamma correction to apply at the end
"""
self.transition_min = transition_min
self.transition_max = transition_max
self.transition_gamma = transition_gamma
super(CloudCompositor, self).__init__(name, **kwargs)
def __call__(self, projectables, **kwargs):
"""Generate the composite."""
data = projectables[0]
# Default to rough IR thresholds
# Values below or equal to this are clouds -> opaque white
tr_min = self.transition_min
# Values above this are cloud free -> transparent
tr_max = self.transition_max
# Gamma correction
gamma = self.transition_gamma
slope = 1 / (tr_min - tr_max)
offset = 1 - slope * tr_min
alpha = data.where(data > tr_min, 1.)
alpha = alpha.where(data <= tr_max, 0.)
alpha = alpha.where((data <= tr_min) | (data > tr_max), slope * data + offset)
# gamma adjustment
alpha **= gamma
res = super(CloudCompositor, self).__call__((data, alpha), **kwargs)
return res
class RatioSharpenedRGB(GenericCompositor):
"""Sharpen RGB bands with ratio of a high resolution band to a lower resolution version.
Any pixels where the ratio is computed to be negative or infinity, it is
reset to 1. Additionally, the ratio is limited to 1.5 on the high end to
avoid high changes due to small discrepancies in instrument detector
footprint. Note that the input data to this compositor must already be
resampled so all data arrays are the same shape.
Example::
R_lo - 1000m resolution - shape=(2000, 2000)
G - 1000m resolution - shape=(2000, 2000)
B - 1000m resolution - shape=(2000, 2000)
R_hi - 500m resolution - shape=(4000, 4000)
ratio = R_hi / R_lo
new_R = R_hi
new_G = G * ratio
new_B = B * ratio
"""
def __init__(self, *args, **kwargs):
"""Instanciate the ration sharpener."""
self.high_resolution_band = kwargs.pop("high_resolution_band", "red")
if self.high_resolution_band not in ['red', 'green', 'blue', None]:
raise ValueError("RatioSharpenedRGB.high_resolution_band must "
"be one of ['red', 'green', 'blue', None]. Not "
"'{}'".format(self.high_resolution_band))
kwargs.setdefault('common_channel_mask', False)
super(RatioSharpenedRGB, self).__init__(*args, **kwargs)
def _get_band(self, high_res, low_res, color, ratio):
"""Figure out what data should represent this color."""
if self.high_resolution_band == color:
ret = high_res
else:
ret = low_res * ratio
ret.attrs = low_res.attrs.copy()
return ret
def __call__(self, datasets, optional_datasets=None, **info):
"""Sharpen low resolution datasets by multiplying by the ratio of ``high_res / low_res``."""
if len(datasets) != 3:
raise ValueError("Expected 3 datasets, got %d" % (len(datasets), ))
if not all(x.shape == datasets[0].shape for x in datasets[1:]) or \
(optional_datasets and
optional_datasets[0].shape != datasets[0].shape):
raise IncompatibleAreas('RatioSharpening requires datasets of '
'the same size. Must resample first.')
new_attrs = {}
if optional_datasets:
datasets = self.match_data_arrays(datasets + optional_datasets)
high_res = datasets[-1]
p1, p2, p3 = datasets[:3]
if 'rows_per_scan' in high_res.attrs:
new_attrs.setdefault('rows_per_scan', high_res.attrs['rows_per_scan'])
new_attrs.setdefault('resolution', high_res.attrs['resolution'])
colors = ['red', 'green', 'blue']
if self.high_resolution_band in colors:
LOG.debug("Sharpening image with high resolution {} band".format(self.high_resolution_band))
low_res = datasets[:3][colors.index(self.high_resolution_band)]
ratio = high_res / low_res
# make ratio a no-op (multiply by 1) where the ratio is NaN or
# infinity or it is negative.
ratio = ratio.where(np.isfinite(ratio) & (ratio >= 0), 1.)
# we don't need ridiculously high ratios, they just make bright pixels
ratio = ratio.clip(0, 1.5)
else:
LOG.debug("No sharpening band specified for ratio sharpening")
high_res = None
ratio = 1.
r = self._get_band(high_res, p1, 'red', ratio)
g = self._get_band(high_res, p2, 'green', ratio)
b = self._get_band(high_res, p3, 'blue', ratio)
else:
datasets = self.match_data_arrays(datasets)
r, g, b = datasets[:3]
# combine the masks
mask = ~(r.isnull() | g.isnull() | b.isnull())
r = r.where(mask)
g = g.where(mask)
b = b.where(mask)
# Collect information that is the same between the projectables
# we want to use the metadata from the original datasets since the
# new r, g, b arrays may have lost their metadata during calculations
info = combine_metadata(*datasets)
info.update(new_attrs)
# Update that information with configured information (including name)
info.update(self.attrs)
# Force certain pieces of metadata that we *know* to be true
info.setdefault("standard_name", "true_color")
return super(RatioSharpenedRGB, self).__call__((r, g, b), **info)
def _mean4(data, offset=(0, 0), block_id=None):
rows, cols = data.shape
# we assume that the chunks except the first ones are aligned
if block_id[0] == 0:
row_offset = offset[0] % 2
else:
row_offset = 0
if block_id[1] == 0:
col_offset = offset[1] % 2
else:
col_offset = 0
row_after = (row_offset + rows) % 2
col_after = (col_offset + cols) % 2
pad = ((row_offset, row_after), (col_offset, col_after))
rows2 = rows + row_offset + row_after
cols2 = cols + col_offset + col_after
av_data = np.pad(data, pad, 'edge')
new_shape = (int(rows2 / 2.), 2, int(cols2 / 2.), 2)
data_mean = np.nanmean(av_data.reshape(new_shape), axis=(1, 3))
data_mean = np.repeat(np.repeat(data_mean, 2, axis=0), 2, axis=1)
data_mean = data_mean[row_offset:row_offset + rows, col_offset:col_offset + cols]
return data_mean
class SelfSharpenedRGB(RatioSharpenedRGB):
"""Sharpen RGB with ratio of a band with a strided-version of itself.
Example::
R - 500m resolution - shape=(4000, 4000)
G - 1000m resolution - shape=(2000, 2000)
B - 1000m resolution - shape=(2000, 2000)
ratio = R / four_element_average(R)
new_R = R
new_G = G * ratio
new_B = B * ratio
"""
@staticmethod
def four_element_average_dask(d):
"""Average every 4 elements (2x2) in a 2D array."""
try:
offset = d.attrs['area'].crop_offset
except (KeyError, AttributeError):
offset = (0, 0)
res = d.data.map_blocks(_mean4, offset=offset, dtype=d.dtype)
return xr.DataArray(res, attrs=d.attrs, dims=d.dims, coords=d.coords)
def __call__(self, datasets, optional_datasets=None, **attrs):
"""Generate the composite."""
colors = ['red', 'green', 'blue']
if self.high_resolution_band not in colors:
raise ValueError("SelfSharpenedRGB requires at least one high resolution band, not "
"'{}'".format(self.high_resolution_band))
high_res = datasets[colors.index(self.high_resolution_band)]
high_mean = self.four_element_average_dask(high_res)
red = high_mean if self.high_resolution_band == 'red' else datasets[0]
green = high_mean if self.high_resolution_band == 'green' else datasets[1]
blue = high_mean if self.high_resolution_band == 'blue' else datasets[2]
return super(SelfSharpenedRGB, self).__call__((red, green, blue), optional_datasets=(high_res,), **attrs)
class LuminanceSharpeningCompositor(GenericCompositor):
"""Create a high resolution composite by sharpening a low resolution using high resolution luminance.
This is done by converting to YCbCr colorspace, replacing Y, and convertin back to RGB.
"""
def __call__(self, projectables, *args, **kwargs):
"""Generate the composite."""
from trollimage.image import rgb2ycbcr, ycbcr2rgb
projectables = self.match_data_arrays(projectables)
luminance = projectables[0].copy()
luminance /= 100.
# Limit between min(luminance) ... 1.0
luminance = da.where(luminance > 1., 1., luminance)
# Get the enhanced version of the composite to be sharpened
rgb_img = enhance2dataset(projectables[1])
# This all will be eventually replaced with trollimage convert() method
# ycbcr_img = rgb_img.convert('YCbCr')
# ycbcr_img.data[0, :, :] = luminance
# rgb_img = ycbcr_img.convert('RGB')
# Replace luminance of the IR composite
y__, cb_, cr_ = rgb2ycbcr(rgb_img.data[0, :, :],
rgb_img.data[1, :, :],
rgb_img.data[2, :, :])
r__, g__, b__ = ycbcr2rgb(luminance, cb_, cr_)
y_size, x_size = r__.shape
r__ = da.reshape(r__, (1, y_size, x_size))
g__ = da.reshape(g__, (1, y_size, x_size))
b__ = da.reshape(b__, (1, y_size, x_size))
rgb_img.data = da.vstack((r__, g__, b__))
return super(LuminanceSharpeningCompositor, self).__call__(rgb_img, *args, **kwargs)
class SandwichCompositor(GenericCompositor):
"""Make a sandwich product."""
def __call__(self, projectables, *args, **kwargs):
"""Generate the composite."""
projectables = self.match_data_arrays(projectables)
luminance = projectables[0]
luminance /= 100.
# Limit between min(luminance) ... 1.0
luminance = luminance.clip(max=1.)
# Get the enhanced version of the RGB composite to be sharpened
rgb_img = enhance2dataset(projectables[1])
rgb_img *= luminance
return super(SandwichCompositor, self).__call__(rgb_img, *args, **kwargs)
# TODO: Turn this into a weighted RGB compositor
class NaturalEnh(GenericCompositor):
"""Enhanced version of natural color composite by Simon Proud.
Args:
ch16_w (float): weight for red channel (1.6 um). Default: 1.3
ch08_w (float): weight for green channel (0.8 um). Default: 2.5
ch06_w (float): weight for blue channel (0.6 um). Default: 2.2
"""
def __init__(self, name, ch16_w=1.3, ch08_w=2.5, ch06_w=2.2,
*args, **kwargs):
"""Initialize the class."""
self.ch06_w = ch06_w
self.ch08_w = ch08_w
self.ch16_w = ch16_w
super(NaturalEnh, self).__init__(name, *args, **kwargs)
def __call__(self, projectables, *args, **kwargs):
"""Generate the composite."""
projectables = self.match_data_arrays(projectables)
ch16 = projectables[0]
ch08 = projectables[1]
ch06 = projectables[2]
ch1 = self.ch16_w * ch16 + self.ch08_w * ch08 + self.ch06_w * ch06
ch1.attrs = ch16.attrs
ch2 = ch08
ch3 = ch06
return super(NaturalEnh, self).__call__((ch1, ch2, ch3),
*args, **kwargs)
class StaticImageCompositor(GenericCompositor):
"""A compositor that loads a static image from disk.
If the filename passed to this compositor is not valid then
the SATPY_ANCPATH environment variable will be checked to see
if the image is located there
Environment variables in the filename are automatically expanded
"""
def __init__(self, name, filename=None, area=None, **kwargs):
"""Collect custom configuration values.
Args:
filename (str): Filename of the image to load, environment
variables are expanded
area (str): Name of area definition for the image. Optional
for images with built-in area definitions (geotiff)
"""
if filename is None:
raise ValueError("No image configured for static image compositor")
self.filename = os.path.expandvars(filename)
self.area = None
if area is not None:
from satpy.resample import get_area_def
self.area = get_area_def(area)