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"""Different functions that are required to operate the program |
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""" |
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import configparser |
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from astropy import units as u |
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from astropy import coordinates as coord |
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from astropy.io import ascii |
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from vlbiplanobs import stations |
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def get_stations_from_configfile(filename='data/stations_catalog.inp'): |
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"""Retrieves the information concerning all stations available in the 'filename' |
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file. Creates a Stations object containing the stations and the information on it. |
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The file must have a format readable by the Python ConfigParser. |
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Each section will be named with the name of the station, and then it must have |
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the following keys: |
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station - full name of the station. |
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code - codename for the station (typically two letters). |
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network - main network to which it belongs to. |
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possible_networks - all networks the station can participate in (including 'network') |
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country - country where the station is located. |
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diameter - string with the diameter of the station. |
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position = x, y, z (in meters). Geoposition of the station. |
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min_elevation (in degrees) - minimum elevation the station can observe. |
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real_time = yes/no - if the station can participate in real-time observations (e.g. e-EVN). |
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SEFD_** - SEFD of the station at the **cm band. If a given band is not present, |
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it is assumed that the station cannot observe it. |
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[optional] |
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img - a path to an image of the station. |
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link - a url linking to the station page/related information. |
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""" |
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config = configparser.ConfigParser() |
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config.read(filename) |
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networks = stations.Stations('network', []) |
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for stationname in config.sections(): |
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temp = [float(i.strip()) for i in config[stationname]['position'].split(',')] |
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a_loc = coord.EarthLocation(temp[0]*u.m, temp[1]*u.m, temp[2]*u.m) |
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# Getting the SEFD values for the bands |
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min_elev = float(config[stationname]['min_elevation'])*u.deg |
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does_real_time = True if config[stationname]['real_time']=='yes' else False |
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sefds = {} |
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for akey in config[stationname].keys(): |
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if 'SEFD_' in akey.upper(): |
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sefds[f"{akey.upper().replace('SEFD_', '').strip()}cm"] = \ |
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float(config[stationname][akey]) |
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new_station = stations.SelectedStation(stationname, config[stationname]['code'], |
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config[stationname]['network'], a_loc, sefds, min_elev, |
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config[stationname]['station'], config[stationname]['possible_networks'], |
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config[stationname]['country'], config[stationname]['diameter'], does_real_time) |
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networks.add(new_station) |
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return networks |
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def stations_with_band(networks, band, output_network_name=None): |
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"""For a given collection of networks or Stations, returns a Stations object |
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including all stations that can observe at the given band. |
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- networks : dict [name_network]: Stations or Stations |
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- band : str |
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""" |
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if output_network_name is None: |
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output_network_name = f"Stations@{band}" |
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antennas = stations.Stations(output_network_name, []) |
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if isinstance(networks, dict): |
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for network in networks: |
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for station in networks[network]: |
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if band in station.bands: |
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antennas.add(station) |
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elif isinstance(networks, stations.Stations): |
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for station in networks: |
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if band in station.bands: |
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antennas.add(station) |
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else: |
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raise ValueError(f"{networks} expected to be either dict of Stations type.") |
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return antennas |
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def print_obs_times(obs, date_format='%d %b %Y'): |
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"""Given an observation, it returns the time range (starttime-endtime) in a smart |
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way. If the observation lasts for less than one day it omits the end date: |
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20 Jan 1971 10:00-20:00UT |
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It also adds the GST range after that. |
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Input: |
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- obs : observation.Observation |
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It must already have set the .times part with an array of astropy.Time times. |
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- date_format : str [optional] |
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Format for the date part (only the date part) of the string to represent |
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the time range. |
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Output: |
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- printed_time : str |
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A string showing the time-range of the observation. |
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""" |
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gsttext = "{:02n}:{:02.2n}-{:02n}:{:02.2n}".format((obs.gstimes[0].hour*60) // 60, |
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(obs.gstimes[0].hour*60) % 60, |
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(obs.gstimes[-1].hour*60) // 60, |
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(obs.gstimes[0].hour*60) % 60) |
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if obs.times[0].datetime.date() == obs.times[-1].datetime.date(): |
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return "{}\n{}-{} UTC\nGST: {}".format(obs.times[0].datetime.strftime(date_format), |
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obs.times[0].datetime.strftime('%H:%M'), |
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obs.times[-1].datetime.strftime('%H:%M'), gsttext) |
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elif (obs.times[-1] - obs.times[0]) < 24*u.h: |
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return "{}\n{}-{} UTC (+1d)\nGST: {}".format( |
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obs.times[0].datetime.strftime(date_format), |
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obs.times[0].datetime.strftime('%H:%M'), |
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obs.times[-1].datetime.strftime('%H:%M'), gsttext) |
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else: |
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return "{} {} to {} {} UTC\nGST: {}".format( |
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obs.times[0].datetime.strftime(date_format), |
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obs.times[0].datetime.strftime('%H:%M'), |
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obs.times[-1].datetime.strftime(date_format), |
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obs.times[-1].datetime.strftime('%H:%M'), gsttext) |
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