import numpy as np
from .baseMetric import BaseMetric
from lsst.sims.utils import Site
import ephem
__all__ = ['NightPointingMetric']
[docs]class NightPointingMetric(BaseMetric):
"""
Gather relevant information for a night to plot.
"""
def __init__(self, altCol='altitude', azCol='azimuth', filterCol='filter',
mjdCol='expMJD', metricName='NightPointing', telescope='LSST', **kwargs):
cols = [altCol, azCol, filterCol, mjdCol]
super(NightPointingMetric, self).__init__(col=cols, metricName=metricName, metricDtype='object', **kwargs)
self.telescope = Site(name=telescope)
self.altCol = altCol
self.azCol = azCol
self.filterCol = filterCol
self.mjdCol = mjdCol
[docs] def run(self, dataSlice, slicePoint=None):
lsstObs = ephem.Observer()
lsstObs.lat = self.telescope.latitude_rad
lsstObs.lon = self.telescope.longitude_rad
lsstObs.elevation = self.telescope.height
pad = 30./60./24.
mjd_min = dataSlice[self.mjdCol].min() - pad
mjd_max = dataSlice[self.mjdCol].max() + pad
# How often to plot the moon and things
step = 20./60./24.
mjds = np.arange(mjd_min, mjd_max+step, step)
sun_alts = []
moon_alts = []
moon_azs = []
sun_azs = []
doff = ephem.Date(0)-ephem.Date('1858/11/17')
djds = mjds - doff
for djd in djds:
lsstObs.date = djd
moon = ephem.Moon(lsstObs)
moon_alts.append(moon.alt + 0)
moon_azs.append(moon.az + 0)
sun = ephem.Sun(lsstObs)
sun_alts.append(sun.alt + 0)
sun_azs.append(sun.az + 0)
moon_alts = np.array(moon_alts)
moon_azs = np.array(moon_azs)
mjds = np.array(mjds)
sun_alts = np.array(sun_alts)
sun_azs = np.array(sun_azs)
return {'dataSlice': dataSlice, 'moon_alts': moon_alts, 'moon_azs': moon_azs, 'mjds': mjds,
'sun_alts': sun_alts, 'sun_azs': sun_azs}