deriveSurfaceWindSpeed.S4: Compute wind speed from wind components in System4 datasets
In SantanderMetGroup/loadeR.ECOMS: A loadeR extension for accessing the ECOMS User Data Gateway (<http://meteo.unican.es/ecoms-udg>)

View source: R/deriveSurfaceWindSpeed.S4.R

deriveSurfaceWindSpeed.S4

R Documentation

Compute wind speed from wind components in System4 datasets

Description

Performs a basic calculation of wind speed from eastward and northward wind components while minimizing the amount of data simultaneously loaded in memory.

Usage

deriveSurfaceWindSpeed.S4(
  gds,
  grid,
  latLon,
  runTimePars,
  memberRangeList,
  foreTimePars
)

Arguments

`gds`	A java “GridDataset”. This is used to load all input java “GeoGrid”'s to derive the target variable.
`grid`	An input java GeoGrid. This is the grid of the ‘leading var’ (`leadVar`) previously loaded for subsetting parameter retrieval (see `deriveInterface` for details).
`latLon`	A list of geolocation parameters, as returned by getLatLonDomainForecast
`runTimePars`	A list of run time definition parameters, as returned by getRunTimeDomain.ECOMS
`memberRangeList`	A list of ensemble java ranges as returned by getMemberDomain.S4
`foreTimePars`	A list of forecast time definition parameters, as returned by getForecastTimeDomain.S4

Details

The function essentially follows the same approach as makeSubset.S4, excepting that at each time step it loads more than one “GeoGrid” in order to compute wind velocity. Within the code, grid corresponds to uas, and grid1 to vas.