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sky.py
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sky.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2015-2016 Joerg Hermann Mueller
#
# This file is part of pynephoscope.
#
# pynephoscope 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.
#
# pynephoscope 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 pynephoscope. If not, see <http://www.gnu.org/licenses/>.
import numpy as np
import cv2
import ephem
from astropy import units as u
from astropy.time import Time
from astropy.io import ascii
from astropy.coordinates import SkyCoord, EarthLocation, AltAz
from astropy.coordinates import Latitude, Longitude
from astropy.table import Column
from skycamerafile import SkyCameraFile
from configuration import Configuration
class SkyCatalog:
def __init__(self, sun_only = False, moon_only = False):
if sun_only:
self.ephemerides = [ephem.Sun()]
self.data = None
elif moon_only:
self.ephemerides = [ephem.Moon()]
self.data = None
else:
self.ephemerides = [ephem.Venus(), ephem.Mars(), ephem.Jupiter(), ephem.Saturn(), ephem.Moon(), ephem.Sun()]
# XEPHEM star catalog files are described on:
# http://www.clearskyinstitute.com/xephem/help/xephem.html#mozTocId468501
self.data = np.loadtxt(Configuration.star_catalog_file, delimiter=',', usecols=(0,2,3,4), dtype=np.dtype([('name', "S20"), ('ra', "S15"), ("dec", "S15"), ("mag", float)]))
# get only the first value of each xephem field. values are sepparated by a pipe |
for value in ('name', 'ra', 'dec'):
self.data[value] = [x.split('|')[0] for x in self.data[value]]
def setLocation(self, location):
self.location = location
def setTime(self, time):
self.time = time
def calculate(self):
ephem_location = ephem.Observer()
ephem_location.lat = self.location.latitude.to(u.rad) / u.rad
ephem_location.lon = self.location.longitude.to(u.rad) / u.rad
ephem_location.elevation = self.location.height / u.meter
ephem_location.date = ephem.Date(self.time.datetime)
if self.data is None:
self.alt = Latitude([], unit=u.deg)
self.az = Longitude([], unit=u.deg)
self.names = Column([], dtype=np.str)
self.vmag = Column([])
else:
ra = Longitude(self.data["ra"], u.h)
dec = Latitude(self.data["dec"], u.deg)
c = SkyCoord(ra, dec, frame='icrs')
altaz = c.transform_to(AltAz(obstime=self.time, location=self.location))
self.alt = altaz.alt
self.az = altaz.az
self.names = self.data['name']
self.vmag = self.data['mag']
for ephemeris in self.ephemerides:
ephemeris.compute(ephem_location)
self.vmag = np.insert(self.vmag, [0], ephemeris.mag)
self.alt = np.insert(self.alt, [0], (ephemeris.alt.znorm * u.rad).to(u.deg))
self.az = np.insert(self.az, [0], (ephemeris.az * u.rad).to(u.deg))
self.names = np.insert(self.names, [0], ephemeris.name)
return self.names, self.vmag, self.alt, self.az
def filter(self, min_alt, max_mag):
show = self.alt >= min_alt
names = self.names[show]
vmag = self.vmag[show]
alt = self.alt[show]
az = self.az[show]
show_mags = vmag < max_mag
names = names[show_mags]
vmag = vmag[show_mags]
alt = alt[show_mags]
az = az[show_mags]
return names, vmag, alt, az
class SkyRenderer:
def __init__(self, size):
self.size = size
self.image = None
self.font = cv2.FONT_HERSHEY_SIMPLEX
def renderCatalog(self, catalog, max_mag):
self.names, self.vmag, self.alt, self.az = catalog.filter(0, max_mag)
return self.render()
def altazToPos(self, altaz):
if not isinstance(altaz, np.ndarray):
altaz = np.array([a.radian for a in altaz])
if len(altaz.shape) == 1:
altaz = np.array([altaz])
r = (1 - altaz[:, 0] / (np.pi / 2)) * self.size / 2
pos = np.ones(altaz.shape)
pos[:, 0] = r * np.cos(-np.pi / 2 - altaz[:, 1]) + self.size / 2
pos[:, 1] = r * np.sin(-np.pi / 2 - altaz[:, 1]) + self.size / 2
return pos
def render(self):
self.image = np.zeros((self.size, self.size, 1), np.uint8)
pos = self.altazToPos(np.column_stack((self.alt.radian, self.az.radian)))
self.x = pos[:, 0]
self.y = pos[:, 1]
for i in range(len(self.names)):
cv2.circle(self.image, (int(self.x[i]), int(self.y[i])), int(7 - self.vmag[i]), 255, -1)
if self.vmag[i] < 2 and not np.ma.is_masked(self.names[i]):
cv2.putText(self.image, self.names[i],(int(self.x[i]) + 6, int(self.y[i])), self.font, .6, 150)
return self.image
def findStar(self, x, y, radius):
r2 = radius * radius
a = np.subtract(self.x, x)
b = np.subtract(self.y, y)
c = a * a + b * b
index = c.argmin()
if c[index] < radius * radius:
return (self.alt[index], self.az[index], self.names[index])
return None
def highlightStar(self, image, altaz, radius, color):
pos = self.altazToPos(altaz)[0]
pos = (int(pos[0]), int(pos[1]))
cv2.circle(image, pos, radius, color)
if __name__ == '__main__':
import sys
window = 'Stars'
size = 768
location = EarthLocation(lat=Configuration.latitude, lon=Configuration.longitude, height=Configuration.elevation)
time = Time.now()
if len(sys.argv) >= 2:
try:
time = SkyCameraFile.parseTime(sys.argv[1])
except:
pass
catalog = SkyCatalog()
catalog.setLocation(location)
catalog.setTime(time)
catalog.calculate()
renderer = SkyRenderer(size)
image = renderer.renderCatalog(catalog, 5)
cv2.namedWindow(window, cv2.WINDOW_AUTOSIZE)
cv2.imshow(window, image)
cv2.waitKey(0)
cv2.destroyAllWindows()