Changes between Version 41 and Version 42 of EcomsUdg/RPackage/Functions


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Timestamp:
Aug 29, 2013 9:36:56 AM (9 years ago)
Author:
juaco
Comment:

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  • EcomsUdg/RPackage/Functions

    v41 v42  
    9494* `Data`: 2D matrix with the time series for each of the stations arranged by columns.
    9595
     96
     97=== ''__Note__''
     98
     99An option to read station data from NetCDF files is currently under development and it is expected to be available by the next release of `meteoR`.
    96100
    97101=== ''__Examples__''
     
    199203=== ''__Details__''
    200204
    201 Regarding the spatial component of the returned data, the function can select the whole spatial domain covered by the dataset (in this case `lonLim = NULL` and `latLim = NULL`), spatial windows defined by the minimum and maximum corner coordinates (for instance `lonLim = c(-10,10)` and `latLim = c(35,45)` indicates a rectangular window), and single grid-cell values (for instance `lonLim = -3.21` and `latLim = 41.087` for retrieving the data in the closest grid point to the point coordinate -3.21E , 41.087N). In the last two cases, the function operates by finding the closest (euclidean distance) grid-points to the coordinates introduced.
    202 
    203 The function has been implemented to access seasonal slices (as determined by the `season` argument. Seasons can be defined in several ways: A single month (e.g. `season = 1` for January), a standard season (e.g. `season=c(1,2,3)` for JFM, or `season=c(12,1,2)` for DJF), or any period of consecutive months (e.g. `season=c(1,2,3,4,5,6)`, for the first half of the year). Seasons are returned for a given year period (defined by the `years` argument, e.g. `years = 1981:2000`) with a homogeneous forecast lead time (as given by the `leadMonth` argument; e.g. `leadMonth = 1` for one-month lead time) with respect to the first month of the selected season. For example, `season=c(1,2,3)` for `years = 1995:2000` and `leadMonth = 1` will return the following series: JFM 1995 (from the December 1994 runtime forecast), ..., JFM 2000 (from the December 1999 runtime forecast). Note that it is also possible to work with year-crossing seasons, such as DJF. In this case,  `season=c(12,1,2)` for `years = 1995:2000` and  `leadMonth = 1` will return the following series: DJF 1994/1995 (from the November 1994 runtime forecast), ..., DJF 1999/2000 (from the November 1999 runtime forecast).
     205Regarding the spatial component of the returned data, the function can select the whole spatial domain covered by the dataset (in this case `lonLim = NULL` and `latLim = NULL`), spatial windows defined by the minimum and maximum corner coordinates (for instance `lonLim = c(-10,10)` and `latLim = c(35,45)` indicates a rectangular window), and single grid-cell values (for instance `lonLim = -3.21` and `latLim = 41.087` for retrieving the data in the closest grid point to the point coordinate -3.21E , 41.087N). In the last two cases, the function operates by finding the nearest (euclidean distance) grid-points to the coordinates introduced.
     206
     207The function has been implemented to access seasonal slices (as determined by the `season` argument. Seasons can be defined in several ways: A single month (e.g. `season = 1` for January), a standard season (e.g. `season=c(1,2,3)` for JFM, or `season=c(12,1,2)` for DJF), or any period of consecutive months (e.g. `season=c(1:6)`, for the first half of the year). Seasons are returned for a given year period (defined by the `years` argument, e.g. `years = 1981:2000`) with a homogeneous forecast lead time (as given by the `leadMonth` argument; e.g. `leadMonth = 1` for one-month lead time) with respect to the first month of the selected season. For example, `season=c(1,2,3)` for `years = 1995:2000` and `leadMonth = 1` will return the following series: JFM 1995 from the December 1994 runtime forecast, ..., JFM 2000 from the December 1999 runtime forecast. Note that it is also possible to work with year-crossing seasons, such as DJF. In this case,  `season=c(12,1,2)` for `years = 1995:2000` and  `leadMonth = 1` will return the following series: DJF 1994/1995 (from the November 1994 runtime forecast), ..., DJF 1999/2000 (from the November 1999 runtime forecast).
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