Table of Contents |
---|
Introduction
This is a brief introduction of the main request parameter syntax.
...
Retrieve example from "View MARS request":
|
|
|
|
Keyword
In the Dataset service there is an extra mandatory keyword called dataset which does not appear in normal MARS requests.
Keyword | definition |
---|---|
dataset | See Available Datasets |
Base time (00, 06, 12 and 18)
Observation time (HHMM or HH:MM: ie 09:30)
Specifies the Analysis date, the Forecast base date or Observations date. Formats
- Absolute as YYYY-MM-DD, YYYYMMDD. The day of the year can also be used: YYYY-DDD
- Relative as -n ; n is the number of days before today (i.e., -1 = yesterday )
- Name of month (e.g. january for Climatology data)
- Operational monthly means are retrieved by setting day (DD) to 00.
Determines the type of field to be retrieved:
This keyword makes the selection between observations, images or fields, and it determines some of the valid remaining keywords of the request.
- Analysis (an)
- Forecast (fc)
- Perturbed Forecast (pf)
- Control Forecast (cf)
Denotes type of level:
- Model level (ml)
- Pressure level (pl)
- Surface (sfc)
- Potential vorticity (pv)
- Potential temperature (pt)
- Depth (dp)
Output grid mesh
- Latitude/longitude increments in degrees (2.5/2.5)
- Number of latitude lines from Pole to Equator (160)
Meteorological parameter. (t, temprerature, 130, 30.128, ...)
format | You can add 'format |
' : "netcdf" to retrieve the data in NetCDF format. |
specifies a Unix file into which data is to be written after retrieval or manipulation. Path names should always be enclosed in double quotes:
target = "analysis.grb"the other possible MARS keywords are explained in the MARS keywords documentation.