How to Use

Submission

You can submit jobs to calculate trajectories in the following three ways.

・Single trajectory

Calculation

You can calculate a single trajectory by specifying the initial time, location (latitude, longitude) and height, trajectory length, trajectory model, and direction of time integration.
The output can be a map image or text file (CSV format).

No user registration is required for submission of this calculation.

Calculation condition
Result

・Trajectories for a Fixed Point

Calculation User registration

You can calculate multiple trajectories for a fixed point at a given interval by specifying the calculation period, initial location (latitude, longitude) and height, calculation interval, trajectory length, trajectory model, and direction of time integration. This is useful for calculating trajectories that have passed over a fixed observation point during a specific period.
*User registration is required for submission of this calculation.

You can manage your calculated results. The results can be projected on a map and downloaded in CSV format.

Calculation condition
Result

・Trajectories for Multiple Points

Calculation User registration

You can calculate trajectories for multiple points at any time by specifying multiple initial times, location (latitude, longitude) and height, trajectory length, trajectory model, and direction of time integration. This is useful for calculating trajectories that pass over mobile observation platforms such as ships or aircrafts, or for calculating trajectories at arbitrary intervals.
*User registration is required for submission of this calculation.

You can manage your calculated results. The results can be projected on a map and downloaded in CSV format.

Calculation condition
Result

Results List

When you calculated multiple trajectories for a fixed point or multiple points, the results are displayed on the "Results List".

List of calculation results

・Status

The processing status of the submission is displayed. Normally, the status changes from "Queue" to "Processing" and then to "Finished". An error message will appear in the progress status when a submission cannot be completed. If you do not understand the details of the error message, please contact us

  • Submit

  • Queue

  • Processing

  • Finished

・Calculation condition

You can check the submitted calculation condition. "Mode" represents the direction of the time integration, where 1 means forward and -1 means backward.

・Result (CSV)

You can download the calculated results in CSV format. The results include the hourly location of the air parcel from the specified date and time, and the planetary boundary layer height (PBLH), wind speed (U, V, W), temperature (T), and surface pressure (P) at the location calculated by interpolating the meteorological data.
# METEX Air trajectory program developed by
#
#     Dr. Jiye Zeng
#     National Institute for Environmental Studies
#     16-2 Onogawa, Tsukuba, Ibaraki, 305-8506 Japan
#
# Model:
#
#     Kinematic
#
# Mode:
#
#     Backward
#
# Notes:
#
#     Isentropic condition may not be conserved near the surface.
#
# Year,Month,Day,Hour,Minute,Lat(deg),Long(deg),Height(m agl),PBLH(m),U(m/s),V(m/s),W(m/s),T(K),P(Pa)
#
2016,1,5,12,0,24.1000,123.5000,500.0,526.2,0.2,7.3,-0.0102,293.9,96064
2016,1,5,11,0,23.8898,123.4968,499.8,488.8,-0.2,5.9,0.0017,293.9,95927
2016,1,5,10,0,23.7172,123.5188,461.8,485.0,-1.1,4.7,0.0161,294.3,96322
......
......

・Map projection

The calculated trajectories can be projected onto a spherical or plane map in the following two ways.

  1. Plot all results on a map
    Select "Plot all calculations in one graph"
  2. Plot one result on a map
    Select "Or plot a selected one only" and specify the number of calculated results to display. The order of the calculated results follows.
    ・Trajectories for a fixed point: The order of calculation over an arbitrary time interval.
    ・Trajectories for multiple points: The first line of the submitted calculation condition is counted as one.

In the upper left corner of the map, the start date or the period of the trajectories projected on the map is shown.

Map plot condition
Map plot

・Delete

You can delete the submitted job or delete the calculated result from the list.

Citaion

Please cite this site when you publish the analysis results using this site. Also, please cite the meteorological data provided by NCEP.

Citation format

Global Environmental Database, Trajectory (METEX), National Institute for Environmental Studies, Japan.
Accessed via https://db.cger.nies.go.jp/ged/metex/en/index.html on YYYY-MM-DD