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The FLEXTRA Prepare Editor
Flextra Prepare Mode
Specifies the data preparation mode. The possible values are: Forecast and Period.
In Forecast mode the selected steps of a given forecast can be used for data generation. If the mode is set to Period a period with a start and end date and constant time-step can be defined. In this case FLEXTRA Prepare tries to retrieve analysis fields from MARS whenever it is possible (for dates in the past) and uses forecast fields otherwise (for dates in the future).
Flextra Fc Mars Expver
The MARS experiment identifier of the forecast fields. The default value is 1 (operational forecast).
Flextra An Mars Expver
The MARS experiment identifier of the analysis fields. The default value is 1 (operational analysis).
Flextra Date
Specifies the run date of the forecast. Available when Flextra Prepare Mode is Forecast.
Flextra Time
Specifies the run time of the forecast . Available when Flextra Prepare Mode is Forecast.
Flextra Steps
Specifies the forecast steps in hours. Here a list of values is given. Available when Flextra Prepare Mode is Forecast.
Flextra Period Start Date
Specifies the start date of the period. Available when Flextra Prepare Mode is Period.
Flextra Period Start Time
Specifies the start time of the period. Available when Flextra Prepare Mode is Period.
Flextra Period End Date
Specifies the end date of the period. Available when Flextra Prepare Mode is Period.
Flextra Period End Time
Specifies the end time of the period. Available when Flextra Prepare Mode is Period.
Flextra Period Step
Specifies the time step of the period in hours. The allowed values are as follows: 3 or 6. Available when Flextra Prepare Mode is Period.
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The VAPOR Prepare Editor
Vapor Input Mode
Specifies the data input mode. The possible values are: Icon and Path. The default value is Icon.
In Icon mode a set of GRIB icons has to be specified in Vapor Input Data. If the mode is set to Path the input data is read from a specified path on the filesystem (yet to be implemented).
Vapor Input Data
Specifies the input data as a set of GRIB icons. It is available when Vapor Input Mode is Icon.
Vapor 2d Params
Specifies the list of 2D parameters from the input data to be converted into VAPOR format. The parameters are identified by their short names or parameter ids. The default value is an empty string.
Vapor 3d Params
Specifies the list of 3D parameters from the input data to be converted into VAPOR format. The parameters are identified by their short names or parameter ids. The default value is an empty string.
Vapor Vertical Grid Type
Specifies the type of the 3D data to be used in VAPOR. The possible values are: Layered and Regular. The default value is Layered.
If the type is set to Layered VAPOR expects a parameter specifying the elevation of each 3D level in the input data. This parameter is then called ELEVATION in VAPOR. The Layered type is typically used when we have pressure or model level (η levels) input data with height or geopotential available.
For the Regular type the vertical grid is supposed to be equidistant (in the user coordinate space). This type can be used when we have data on equidistant height levels.
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The Regular type can also be used for pressure or model level data when no height information is available. In this case the 3D scene is rendered in a pressure or model level "space". Besides, because VAPOR requires vertical coordinate values increasing along the z axis the vertical coordinate values (pressure or model level number) are multiplied by -1 for VAPOR. |
Vapor Elevation Param
Specifies the short name or parameter id of of the 3D parameter interpreted as the elevation of the 3D levels. Available when Vapor Vertical Grid Type is Layered.
This parameter has to be either the height or the geopotential (z) of the levels. If geopotential is specified it is converted into metres by Metview for Vapor. The default value is z.
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Please note that neither the height nor the geopotential of model levels are archived in MARS. It means that for model level data either of these fields has to be computed for Layered mode. These computations can be done with VAPOR Prepare by simply specifying z for Vapor Elevation Param. The computations can only be carried out if the input data contains temperature (t) and specific humidity (q) on model levels and geopotential (z) and logarithm of surface pressure (lnsp) on the bottommost model level. |
Vapor Bottom Coordinate
The bottom elevation level. Available when Vapor Vertical Grid Type is Layered. The default value is 0.
Vapor Top Coordinate
The top elevation level. Available when Vapor Vertical Grid Type is Layered. The default value is 16000.
Vapor Area Selection
Specifies the area selection mode. The possible values are: Native and Interpolate. The default value is Native.
If it is set to Native the whole area of the input data is converted into VAPOR format. While if it is set to Interpolate the input data is interpolated to a specific (lat-lon) grid and area.
Vapor
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Area
Specifies the area of the output grid in south/west/north/east format. The default value is -90/-180/90/180. Available when Vapor Area Selection is Interpolate.
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Vapor Grid
Specifies the resolution of the output grid in dx/dy format, where dx is the grid increment in east-west direction, while dy is the grid increment in north-south direction (both in degrees units). The default value is: 1/1. Available when Vapor Area Selection is Interpolate.
Flextra Top Level
Only data on and below this model level will be used to generate the FLEXTRA input fields. This level can be specified either as a model level or as a pressure value. In the latter case FLEXTRA Prepare will use the data retrieved for the first date to determine the topmost model level. The default value of this parameter is 1, which mens that all the model levels will be used if Flextra Top Level Units is set to Model Levels.
Flextra Top Level Units
Specifies the units of the value of Flextra Top Level. The allowed values are Model Levels or hPa. The default value is Model Levels.
Flextra Reuse Input
If this parameter is set On FLEXTRA Prepare checks the existence of the data files to be generated and if they are already in place no new data is retrieved and processed. If it is Off all the fields are always retrieved and processed and the existing data files are overwritten. The same happens to the AVAILABLE file. The existence of a FLEXTRA input GRIB file is checked by using the file name and a set of GRIB API keys from the first message in the file. These keys are as follows: date, time, stepRange, gridType, iDirectionIncrement, jDirectionIncrement, latitudeOfFirstGridPoint, latitudeOfLastGridPoint, longitudeOfFirstGridPoint, longitudeOfLastGridPoint.
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Vapor Step Number
Specifies the number of steps from the input dataset that will be converted into the VAPOR format. The default value is -1 meaning that all the available steps will be converted.
Vapor Refinement Level
This option specifies the number of refinement levels in a VAPOR data approximation hierarchy where the resolution of each successive level is a factor of two finer along each dimension. If level is 0 no hierarchy will be created (all data will be stored at their native resolution). If level is 1 a single approximation will be created, thus the hierarchy will have two levels: the first approximation (indexed as 0 in VAPOR) and the native grid resolution (indexed as 1 in VAPOR). And so on.
The default value is: 2.
Vapor Vdf Name
Specifies the name of the resulting VDF file (the .vdf suffix is automatically appended to the filename). The default value is an empty string.
Vapor Output Path
Specifies the output directory (it has to be an absolute can be a relative path) where the GRIB files and the AVAILABLE file VDF file and VDC directory hierarchy will be generated. If this directory does not exist Metview will create it. The default value is /tmp.
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VAPOR data files can be huge (gigabytes) so the output |
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path to store the results of the GRIB to VAPOR conversion should always be carefully selected. |