Table of Contents |
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Introduction
This is a brief introduction of the main request parameter syntax.
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Retrieve example from "View MARS request":
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Keyword
Keyword | definition |
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dataset | See Dataset section below. |
Date & Time | |
time | Base time (00, 06, 12 and 18) Observation time (HHMM or HH:MM: ie 09:30) |
date | Specifies the Analysis date, the Forecast base date or Observations date. Formats
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step | Specifies the forecast time step from forecast base time. Valid values are hours (HH) |
Fields | |
type | 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.
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levtype | Denotes type of level:
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param | Meteorological parameter. (t, temprerature, 130, 30.128, ...) |
grid | Output grid mesh
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Storage | |
target | 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" |
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Note |
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To access these datasets, you need to agree on the corresponding terms and conditions that can be found under the "Licence" link in the table below. Catalogues can be found in http://apps.ecmwf.int/datasets |
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In the Dataset service there is an extra mandatory keyword called dataset which does not appear in normal MARS requests.
Keyword | definition |
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dataset | See Available Datasets |
format | You can add 'format' : "netcdf" to retrieve the data in NetCDF format. |
the other possible MARS keywords are explained in the MARS keywords documentation.
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