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generate_json.py
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# Script to read dat file and generate the appriate JSON
import os
import json
with open('input/NearbyGalaxies.dat', 'r') as f:
for i, line in enumerate(f):
if i < 37:
continue
# if i > 37: break # run only on one file
print(line)
name = line[:19].strip()
if name[0] == '*': name = name[1:]
# print(name)
# Right Ascension
rah = float(line[19:21])
ram = float(line[22:24])
ras = float(line[25:29])
ra = round(15*(rah + ram/60. + ras/3600.),5)
# print(rah, ram, ras, ra)
# Declination
decd = float(line[30:33])
decm = float(line[34:36])
decs = float(line[37:39])
if decd < 0:
sign = -1
decd = abs(decd)
else:
sign = +1
dec = round(sign * (decd + decm / 60. + decs / 3600.),5)
# print(decd, decm, decs, dec)
# Foreground Reddening
ebv = float(line[41:45])
# Distance modulus
dm = float(line[46:51])
dm_upp = float(line[53:56])
dm_low = float(line[58:61])
# Radial velocity
rv = float(line[62:68])
rv_upp = float(line[69:73])
rv_low = float(line[74:78])
# V mag
vm = float(line[79:83])
vm_upp = float(line[84:87])
vm_low = float(line[88:91])
# Position angle
pa = float(line[92:97])
pa_upp = float(line[98:102])
pa_low = float(line[103:107])
# Projected ellipticity
el = float(line[108:112])
el_upp = float(line[113:117])
el_low = float(line[118:122])
# Central surface brightness
muv = float(line[123:127])
muv_upp = float(line[128:131])
muv_low = float(line[132:135])
# Half-light radius
rh = float(line[136:142])
rh_upp = float(line[143:148])
rh_low = float(line[149:154])
# RV dispersion
sigma = float(line[155:159])
sigma_upp = float(line[160:164])
sigma_low = float(line[165:169])
json_dict = {'name': name,
'ra': [{'value': ra, 'best': 1, 'reference': '', 'unit': 'deg'}],
'dec': [{'value': dec, 'best': 1, 'reference': '', 'unit': 'deg'}],
'ebv': [{'value': ebv, 'best': 1, 'reference': ''}],
'distance_modulus': [{'value': dm,
'error_upper': dm_upp,
'error_lower': dm_low,
'best': 1,
'reference': ''}],
'radial_velocity': [{'value': rv,
'error_upper': rv_upp,
'error_lower': rv_low,
'best': 1,
'reference': ''}],
'v_mag': [{'value': vm,
'error_upper': vm_upp,
'error_lower': vm_low,
'best': 1, 'unit': 'mag',
'reference': ''}],
'position_angle': [{'value': pa,
'error_upper': pa_upp,
'error_lower': pa_low,
'best': 1, 'unit': 'deg',
'reference': ''}],
'ellipticity': [{'value': el,
'error_upper': el_upp,
'error_lower': el_low,
'best': 1,
'reference': ''}],
'surface_brightness': [{'value': muv,
'error_upper': muv_upp,
'error_lower': muv_low,
'best': 1, 'unit': 'mag/(arcsec*arcsec)',
'reference': ''}],
'half-light_radius': [{'value': rh,
'error_upper': rh_upp,
'error_lower': rh_low,
'best': 1, 'unit': 'arcmin',
'reference': ''}],
'stellar_radial_velocity_dispersion': [{'value': sigma,
'error_upper': sigma_upp,
'error_lower': sigma_low,
'best': 1, 'unit': 'km/s',
'reference': ''}],
}
# Clean up missing values
for k, v in json_dict.copy().items():
if k == 'name':
continue
e = v[0]
if (e['value'] == 99.99 and e['error_upper'] == 9.99) or \
(e['value'] == 999.9 and e['error_upper'] == 99.9) or \
(e['value'] == 99.9 and e['error_upper'] == 99.9) or \
(e['value'] == 99.9 and e['error_upper'] == 9.9) or \
(e['value'] == 9.9 and e['error_upper'] == 9.9) or \
(e['value'] == 99.0 and e['error_upper'] == 9.0) or \
(e['value'] == 999.0 and e['error_upper'] == 99.0) or \
(e['value'] == 9.99 and e['error_upper'] == 9.99):
del json_dict[k]
json_data = json.dumps(json_dict, indent=4, sort_keys=False)
# print(json_data)
# Write to file
out_dir = 'data'
filename = name.strip().replace(' ', '_')+'.json'
with open(os.path.join(out_dir, filename), 'w') as f:
f.write(json_data)