Data Schemas#
GMN data fields are accessible through Pandas DataFrames produced by the
gmn-python-api library. See the
meteor_trajectory_schema API Reference section
for function and variable details.
Accessing meteor trajectory fields code example#
from gmn_python_api import data_directory as dd
from gmn_python_api import meteor_trajectory_reader
# Access column names (verbose)
traj_file_content = dd.get_daily_file_content_by_date("2019-07-24")
traj_df = meteor_trajectory_reader.read_data(
traj_file_content,
output_camel_case=False,
)
traj_df.iloc[0]['Vgeo (km/s)']
# 63.95235
# Access column names (camel case)
traj_file_content = dd.get_daily_file_content_by_date("2019-07-24")
traj_df = meteor_trajectory_reader.read_data(
traj_file_content,
output_camel_case=True,
)
traj_df.iloc[0]['vgeo_km_s']
# 63.952355
The model data file is meteor_trajectory_schema._MODEL_METEOR_TRAJECTORY_FILE_PATH. The
one line version of the file is meteor_summary_schema._MODEL_METEOR_TRAJECTORY_FILE_ONE_ROW_PATH.
Verbose and camel case column names can be found below.
Meteor Trajectory Features#
Listing of current data schema (version 1.0).
Verbose Name |
Camel Case Name |
Description |
|---|---|---|
Unique trajectory (identifier) |
unique_trajectory_identifier |
(Index) A 20-character string containing the beginning time (rounded to seconds) and a truncated MD5 hash encoding the trajectory position. |
Beginning Julian date |
beginning_julian_date |
Julian date of the beginning of the meteor. |
Beginning (UTC Time) |
beginning_utc_time |
UTC time of the beginning of the meteor. |
IAU (No) |
iau_no |
IAU shower number, see https://www.ta3.sk/IAUC22DB/MDC2007/Roje/roje_lista.php. Sporadic meteors have a code -1. |
IAU (code) |
iau_code |
Three-letter IAU shower code. Sporadic meteors have a code “…”. |
Sol lon (deg) |
sol_lon_deg |
Solar longitude of the beginning of the meteor. |
App LST (deg) |
app_lst_deg |
Apparent local sidereal time of the beginning of the meteor. |
RAgeo (deg) |
rageo_deg |
Geocentric right ascension in the J2000 epoch. |
+/- (sigma) or +/- (sigma.x) |
sigma or sigma_x |
One sigma error (repeated for every previous value). sigma (without number) is the first value. The rest contain a number starting at 1. |
DECgeo (deg) |
decgeo_deg |
Geocentric declination in the J2000 epoch. |
LAMgeo (deg) |
lamgeo_deg |
Geocentric ecliptic longitude in the J2000 epoch. |
BETgeo (deg) |
betgeo_deg |
Geocentric ecliptic latitude in the J2000 epoch. |
Vgeo (km/s) |
vgeo_km_s |
Geocentric velocity. |
LAMhel (deg) |
lamhel_deg |
Heliocentric ecliptic longitude in the J2000 epoch. |
BEThel (deg) |
bethel_deg |
Heliocentric ecliptic latitude in the J2000 epoch. |
Vhel (deg) |
vhel_km_s |
Heliocentric velocity. |
a (AU) |
a_au |
Semi-major axis. |
e |
e |
Eccentricity. |
i (deg) |
i_deg |
Inclination. |
peri (deg) |
peri_deg |
Argument of perihelion. |
node (deg) |
node_deg |
Ascending node. |
Pi (deg) |
pi_deg |
Longitude of perihelion. |
b (deg) |
b_deg |
Latitude of perihelion. |
q (AU) |
q_au |
Perihelion distance. |
f (deg) |
f_deg |
True anomaly at the beginning of the meteor. |
M (deg) |
m_deg |
Mean anomaly. |
Q (AU) |
q_au_ |
Aphelion distance. |
n (deg/day) |
n_deg_day |
Mean motion in the orbit. |
T |
t_years |
Orbital period. |
TisserandJ |
tisserandj |
Tisserand’s parameter with respect to Jupiter. |
RAapp (deg) |
raapp_deg |
Apparent ground-fixed radiant right ascension in the epoch of date. |
DECapp (deg) |
decapp_deg |
Apparent ground-fixed radiant declination in the epoch of date. |
Azim +E (of N deg) |
azim_e_of_n_deg |
Apparent ground-fixed radiant azimuth (+east of due north convention). |
Elev (deg) |
elev_deg |
Apparent ground-fixed radiant elevation (i.e. entry angle). |
Vinit (km/s) |
vinit_km_s |
Apparent ground-fixed initial velocity. |
Vavg (km/s) |
vavg_km_s |
Apparent ground-fixed average velocity. |
LatBeg (+N deg) |
latbeg_n_deg |
Latitude of the beginning of the meteor. |
LonBeg (+E deg) |
lonbeg_e_deg |
Longitude of the beginning of the meteor. |
HtBeg (km) |
htbeg_km |
Begin height of the meteor (above the WGS84 ellipsoid). |
LatEnd (+N deg) |
latend_n_deg |
Latitude of the meteor end. |
LonEnd (+E deg) |
lonend_e_deg |
Longitude of the meteor end. |
HtEnd (km) |
htend_km |
End height of the meteor (above the WGS84 ellipsoid). |
Duration (sec) |
duration_sec |
Observed meteor duration. |
Peak (AbsMag) |
peak_absmag |
Peak magnitude normalized to the range of 100 km. |
Peak Ht (km) |
peak_ht_km |
Height at which with peak magnitude occured. |
F (param) |
f_param |
The F parameter defined as (HtBeg - PeakHt)/(HtBeg - HtEnd) |
Mass kg (tau=0.7%) |
mass_kg_tau_0_7 |
Mass in kilograms computed with a dimensionless luminous efficiency of 0.7%. |
Qc (deg) |
qc_deg |
Maximum convergence angle between all stations that observed the meteor. |
MedianFitErr (arcsec) |
medianfiterr_arcsec |
Median angular trajectory fit errors in arc seconds. |
Beg in (FOV) |
beg_in_fov |
Beginning of the meteor observed by at least one camera. |
End in (FOV) |
end_in_fov |
Ending of the meteor observed by at least one camera. |
Num (stat) |
num_stat |
Number of stations which observed the meteor. |
Participating (stations) |
participating_stations |
Station codes of stations which observed the meteor. |
Source: https://globalmeteornetwork.org/data/media/GMN_orbit_data_columns.pdf