Changes between Version 65 and Version 66 of udg/ecoms/dataserver/catalog


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Timestamp:
Jul 29, 2014 11:18:45 AM (7 years ago)
Author:
juaco
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  • udg/ecoms/dataserver/catalog

    v65 v66  
    33Note that the '''R names''' below correspond to the vocabulary names used in the [wiki:RPackage R data access package], which may not correspond to the different vocabularies of each particular dataset. These names have been used for homogenization purposes to build the [wiki:RPackage/Homogeneization vocabulary] of the [wiki:RPackage R package for data access]. Note that, '''data homogenization and aggregation (i.e. daily means from 6h data) is only provided through the [wiki:RPackage R data access package].'''
    44
    5 In order to specify the particular '''temporal frequency/aggregation''' available for the variables in the different datasets, the following codes are used in the table below: '''6h''' (6-hourly instantaneous data). '''12h''' (12-hourly instantaneous data). '''24h''' (24-hourly instantaneous data). '''DM''' (daily mean value). '''DX''' (daily maximum value). '''DN''' (daily minimum value).  '''DA''' (daily accumulated data). '''DAr''' (accumulated since the initialization time –`runtime`). '''fx''' (static field)
     5In order to specify the particular '''temporal frequency/aggregation''' available for the variables in the different datasets, the following codes are used in the table below: '''6h''' (6-hourly instantaneous data). '''12h''' (12-hourly instantaneous data). '''24h''' (24-hourly instantaneous data). '''DM''' (daily mean value). '''DX''' (daily maximum value). '''DN''' (daily minimum value).  '''DA''' (daily accumulated data). '''DAr''' (accumulated since the initialization time –`runtime`) NOTE: The R package performs deaccumulation on a daily basis to match the standard definition. '''fx''' (static field)
    66
    77In the table below, boldface codes (e.g. '''6h''') indicate variables already available through the ECOMS UDG. '''Italics''' are used for work in progress (variables to be included in the next update). '''e''' indicates that a variable exists in the original dataset but it is not planned to be included yet in ECOMS-UDG; '''blanks''' indicate that the variables do not exist in the original dataset. Codes ended by '''(*)''' indicate variables which do NOT exist in the dataset, but are derived/approximated from other available ones through the [wiki:RPackage R  data access package] .  More information on the particular approximations used are given in the [http://meteo.unican.es/trac/wiki/EcomsUdg/EndUserNeeds/ListOfVariables variables-datasets mapping]. Variables ended by '''(#)''' indicate daily aggregated values obtained from the corresponding original 3-hourly data.
     
    2121||tdps||2m Dewpoint Temperature ||    ||    ||  '''6h'''  ||  e  || || ||  e  ||
    2222||huss||Surface (2m) specific humidity ||  '''DM'''  ||  '''6h'''  ||  '''6h(*)'''  || || ||  e  || ||
    23 ||rsds||Surface Downwelling Shortwave Radiation||  '''DA'''  ||  '''6hA'''  ||  '''DA'''  ||  e  || ||  e  ||  e  ||
    24 ||rlds||Net Longwave Surface Radiation||  '''DA'''  ||  '''6hA'''  ||  '''DA'''  ||  e  || ||  e  ||  e  ||
     23||rsds||Surface Downwelling Shortwave Radiation||  '''DA'''  ||  '''6hA'''  ||  '''DAr'''  ||  e  || ||  e  ||  e  ||
     24||rlds||Net Longwave Surface Radiation||  '''DA'''  ||  '''6hA'''  ||  '''DAr'''  ||  e  || ||  e  ||  e  ||
    2525||sst||Sea surface temperature||    ||   ||  e   ||  e  ||  e  || || ||
    2626||uas||Eastward Near-Surface Wind ||    ||  '''6h'''  ||  '''6h'''  ||  e  ||  e  ||  e  ||  e  ||
     
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    50 '''Data Homogeneization:''' The different nature of the datasets, and the idiosyncratic naming and storage conventions often applied by the modelling centres, makes necessary an homogeneization across datasets in order to implement a truly user-friendly toolbox for data access.  To this aim, the [wiki:RPackage R package for data access] has been developed. Data homogeneization is achieved through the creation of a common vocabulary. The particular variables of each dataset are then translated -and transformed if necessary- into the common vocabulary by means of a ''dictionary''. Both features -vocabulary and dictionary- are described [wiki:RPackage/Homogeneization here].
     50'''Data Homogeneization:''' The different nature of the datasets, and the idiosyncratic naming and storage conventions often applied by the modelling centres, makes necessary an homogenization across datasets in order to implement a truly user-friendly toolbox for data access.  To this aim, the [wiki:RPackage R package for data access] has been developed. Data homogenization is achieved through the creation of a common vocabulary. The particular variables of each dataset are then translated -and transformed if necessary- into the common vocabulary by means of a ''dictionary''. Both features -vocabulary and dictionary- are described [wiki:RPackage/Homogeneization here]. In particular, some typical transformations performed by the `loadECOMS` interface are deaccumulation of initialization-accumulated variables to daily accumulated (i.e.: '''DAr''' --> '''DA''') and scaling and/or offset of variables to match standard units (e.g. -273.15 for conversion K --> ºC).