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| #!/usr/bin/env python | ||
| # -*- coding: utf-8 -*- | ||
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| # Copyright (c) 2018 Adam.Dybbroe | ||
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| # Author(s): | ||
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| # Adam.Dybbroe <a000680@c20671.ad.smhi.se> | ||
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| # This program 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. | ||
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| # This program 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. | ||
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| # You should have received a copy of the GNU General Public License | ||
| # along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
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| """Drawing satellite overpass outlines on maps | ||
| """ | ||
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| import os | ||
| import logging | ||
| import logging.handlers | ||
| import numpy as np | ||
| import matplotlib as mpl | ||
| MPL_BACKEND = mpl.get_backend() | ||
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| logger = logging.getLogger(__name__) | ||
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| try: | ||
| import cartopy.crs as ccrs | ||
| import cartopy.feature as cfeature | ||
| BASEMAP_NOT_CARTOPY = False | ||
| except ImportError: | ||
| logger.warning("Failed loading Cartopy, will try Basemap instead") | ||
| BASEMAP_NOT_CARTOPY = True | ||
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| class MapperBasemap(object): | ||
| """A class to generate nice plots with basemap. | ||
| """ | ||
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| def __init__(self, **proj_info): | ||
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| from mpl_toolkits.basemap import Basemap | ||
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| if not proj_info: | ||
| proj_info = { | ||
| 'projection': 'nsper', | ||
| 'lat_0': 58, | ||
| 'lon_0': 16, | ||
| 'resolution': 'l', | ||
| 'area_thresh': 1000. | ||
| } | ||
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| self.map = Basemap(**proj_info) | ||
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| self.map.drawcoastlines() | ||
| self.map.drawcountries() | ||
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| self.map.drawmapboundary(fill_color='white') | ||
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| self.map.drawmeridians(np.arange(0, 360, 30)) | ||
| self.map.drawparallels(np.arange(-90, 90, 30)) | ||
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| def __enter__(self): | ||
| return self.map | ||
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| def __exit__(self, etype, value, tb): | ||
| pass | ||
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| class MapperCartopy(object): | ||
| """A class to generate nice plots with Cartopy. | ||
| """ | ||
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| def __init__(self, **proj_info): | ||
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| mpl.use(MPL_BACKEND) | ||
| import matplotlib.pyplot as plt | ||
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| if not proj_info: | ||
| proj_info = { | ||
| 'central_latitude': 58, | ||
| 'central_longitude': 16, | ||
| 'satellite_height': 35785831, | ||
| 'false_easting': 0, | ||
| 'false_northing': 0, | ||
| 'globe': None | ||
| } | ||
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| fig = plt.figure(figsize=(8, 6)) | ||
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| self._ax = fig.add_subplot( | ||
| 1, 1, 1, projection=ccrs.NearsidePerspective(**proj_info)) | ||
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| self._ax.add_feature(cfeature.OCEAN, zorder=0) | ||
| self._ax.add_feature(cfeature.LAND, zorder=0, edgecolor='black') | ||
| self._ax.add_feature(cfeature.BORDERS, zorder=0) | ||
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| self._ax.set_global() | ||
| self._ax.gridlines() | ||
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| def plot(self, *args, **kwargs): | ||
| mpl.use(MPL_BACKEND) | ||
| import matplotlib.pyplot as plt | ||
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| kwargs['transform'] = ccrs.Geodetic() | ||
| return plt.plot(*args, **kwargs) | ||
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| def nightshade(self, utctime, **kwargs): | ||
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| from trollsched.helper_functions import fill_dark_side | ||
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| color = kwargs.get('color', 'black') | ||
| alpha = kwargs.get('alpha', 0.4) | ||
| fill_dark_side(self._ax, time=utctime, color=color, alpha=alpha) | ||
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| def __call__(self, *args): | ||
| return args | ||
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| def __enter__(self): | ||
| return self | ||
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| def __exit__(self, etype, value, tb): | ||
| pass | ||
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| if BASEMAP_NOT_CARTOPY: | ||
| Mapper = MapperBasemap | ||
| else: | ||
| Mapper = MapperCartopy | ||
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| def save_fig(pass_obj, | ||
| poly=None, | ||
| directory="/tmp/plots", | ||
| overwrite=False, | ||
| labels=None, | ||
| extension=".png", | ||
| outline='-r'): | ||
| """Save the pass as a figure. Filename is automatically generated. | ||
| """ | ||
| mpl.use('Agg') | ||
| import matplotlib.pyplot as plt | ||
| plt.clf() | ||
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| logger.debug("Save fig " + str(pass_obj)) | ||
| rise = pass_obj.risetime.strftime("%Y%m%d%H%M%S") | ||
| fall = pass_obj.falltime.strftime("%Y%m%d%H%M%S") | ||
| if not os.path.exists(directory): | ||
| logger.debug("Create plot dir " + directory) | ||
| os.makedirs(directory) | ||
| filename = os.path.join( | ||
| directory, | ||
| (rise + pass_obj.satellite.name.replace(" ", "_") + fall + extension)) | ||
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| pass_obj.fig = filename | ||
| if not overwrite and os.path.exists(filename): | ||
| return filename | ||
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| logger.debug("Filename = <%s>", filename) | ||
| with Mapper() as mapper: | ||
| mapper.nightshade(pass_obj.uptime, alpha=0.2) | ||
| logger.debug("Draw: outline = <%s>", outline) | ||
| draw(pass_obj.boundary.contour_poly, mapper, outline) | ||
| if poly is not None: | ||
| draw(poly, mapper, "-b") | ||
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| logger.debug("Title = %s", str(pass_obj)) | ||
| plt.title(str(pass_obj)) | ||
| for label in labels or []: | ||
| plt.figtext(*label[0], **label[1]) | ||
| logger.debug("Save plot...") | ||
| plt.savefig(filename) | ||
| logger.debug("Return...") | ||
| return filename | ||
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| def show(pass_obj, | ||
| poly=None, | ||
| labels=None, | ||
| other_poly=None, | ||
| proj=None, | ||
| outline='-r'): | ||
| """Show the current pass on screen (matplotlib, basemap). | ||
| """ | ||
| mpl.use(MPL_BACKEND) | ||
| import matplotlib.pyplot as plt | ||
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| proj = proj or {} | ||
| with Mapper(**proj) as mapper: | ||
| mapper.nightshade(pass_obj.uptime, alpha=0.2) | ||
| draw(pass_obj.boundary.contour_poly, mapper, outline) | ||
| if poly is not None: | ||
| draw(poly, mapper, "-b") | ||
| if other_poly is not None: | ||
| draw(other_poly, mapper, "-g") | ||
| plt.title(str(pass_obj)) | ||
| for label in (labels or []): | ||
| plt.figtext(*label[0], **label[1]) | ||
| plt.show() | ||
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| def draw(poly, mapper, options, **more_options): | ||
| lons = np.rad2deg(poly.lon.take(np.arange(len(poly.lon) + 1), mode="wrap")) | ||
| lats = np.rad2deg(poly.lat.take(np.arange(len(poly.lat) + 1), mode="wrap")) | ||
| rx, ry = mapper(lons, lats) | ||
| mapper.plot(rx, ry, options, **more_options) | ||
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| def main(): | ||
| from trollsched.satpass import get_next_passes | ||
| from datetime import datetime | ||
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| passes = get_next_passes(["noaa 19", "suomi npp"], datetime.now(), 24, (16, 58, 0)) | ||
| for p in passes: | ||
| save_fig(p, directory="/tmp/plots/") | ||
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| if __name__ == '__main__': | ||
| main() |
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