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The dissemination of
Ocean Waves Prediction products is controlled in a similar manner
as the dissemination of data from ECMWF's medium-range forecasting
system. Dissemination requirements for Ocean Waves Prediction
products are added to the general set of dissemination requirements
for each Member State - it is not necessary to update and maintain
separate sets of requirements for products required from this
optional project.
The rules for
requesting dissemination products from ECMWF apply also to Ocean
Waves Prediction products. Member States can maintain their own
dissemination requirements using web facility
(https://msaccess.ecmwf.int:9443/do/product/requirements/); they
also may request ECMWF to make changes on their behalf. Requests
for ECMWF to make changes to dissemination requirements should be
addressed in writing or by computer e-mail from the Member State's
TAC representative to the Head of Operations at ECMWF, or to the
Head of the "Data and Services Section", who is authorised by the
Head of Operations to act on his behalf with respect to such
changes. Dissemination requirements are presented by mean of
command language. This language has been designed to conform, where
possible, to the MARS command language.
Identification
parameters
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STREAM
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=
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WAVE
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[WV]
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DOMAIN
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=
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GLOBAL
MEDITERRANEAN
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[G]
[M]
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(default)
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TYPE
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=
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ANALYSIS
FORECAST
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[AN]
[FC]
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LEVTYPE
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=
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SURFACE
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[SFC]
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LEVELIST
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=
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OFF
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Target
parameters
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TARGET
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=
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"destination:dissemination_stream_name"
- destination is a
three character destination name;
-
dissemination_stream_name is a two character dissemination stream
name
(the list of
destinations/streams is published on:
https://msaccess.ecmwf.int:9443/do/product/requirements/)
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PRIORITY
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=
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1 - 99
Indicates the
transmission priority of a `dissemination stream'.
(value 1 being the
highest and value 99 being the lowest transmission priority);
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Date and time
parameters
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TIME
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=
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* (hours)
Gives analysis 12,
18, 00, 06 or forecast base time 12, 00.
|
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STEP
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=
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* (hours) default is
00
Gives forecast and
analysis time step(s);.
For analysis value
is 00.
Global model:
3/to/144/by/3, 150/to/240/by/6
European
(Mediterranean/Baltic) model: 6/to/120/by/6
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Meteorological
parameters
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PARAM
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=
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Field name
abbreviation
*
NB ALL is not
permitted.
Available parameters
are listed in Table 6.1.
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Data processing
parameters
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RESOL
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=
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ARCHIVED VALUE
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[AV]
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FORMAT
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=
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GRIB
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[GB]
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GAUSSIAN
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=
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OFF
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GRID
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=
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a/b
AUTOMATIC [AUTO]
a= grid resolution
(deg.) along a latitude line (i.e. East/West)
b= grid resolution
(deg.) along a longitude line (i.e. North/South)
Global model:
0.25/0.25 or multiples thereof
Mediterranean/European model: 0.125/0.125 or
multiples thereof
AUTOMATIC - values
for the parameter GRID will be defined automatically based on
DOMAIN parameter values;
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AREA
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=
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*/*/*/*
Output area
definition. Four values (3 decimal places allowed) to provide a
user- defined sub-area as North/West/South/East;
Negative values
indicate western longitudes and southern latitudes.
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FRAME
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=
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OFF to switch off
the frame option
n
n is the number of
points inward from each edge of defined area required to form a
boundary product. The resulting FM 92 GRIB code will contain bits
set within the appropriate ate flag to indicate that sections 2 and
3 are both present.
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BITMAP
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=
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OFF to switch off
the bitmap option
"filename"
"filename" is the
name of a file containing a valid user-defined bitmap specification
to build a product by selecting data from points of a latitude-
longitude or a
Gaussian grid.
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ACCURACY
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=
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NORMAL
ARCHIVED VALUE
n
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[N]
[AV]
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(default) - GRIB
only
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n is the number of
bits per packed value. n must not be less than half of default
value nor greater then 24.
[N] - Default values
are listed in the Table 4.2
[AV] - Resulting
field will have accuracy of the originally generated and archived
field.
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PACKING
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=
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ARCHIVED VALUE
SIMPLE
SECOND ORDER
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[AV]
[SIM]
[SO]
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(default)
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AV - GRIB packing as
currently in use, at the moment SIMPLE for grid point data.
SIM - simple
packing;
SO - grid point data
only (substantiality reduces the size of GRIB messages);
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PADDING
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=
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AUTOMATIC
NONE
n
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[AUTO]
[N]
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as currently in use
(default);
no padding;
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n is the number of
bytes to which multiple the binary message is padded to with NULL
bytes;
The meaning of AUTO
is at the moment 120 bytes for GRIB data and 8 bytes for BUFR data.
Also, these are the only values supported for n at the moment.
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OPTIONS
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=
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NORMAL
DELAY
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[NORM] (default)
[DELA]
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Note:
DELAY causes
products to be generated, but not transmitted;
DELAY products can
be obtained using the repeat facility.
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