Changes between Version 59 and Version 60 of udg/ecoms/RPackage/examples

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Sep 2, 2014 6:13:33 PM (7 years ago)
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 v59 2. '''Loading time''': The time spent in a request does not depend exclusively on the size of the object to be loaded, but also largely depends on the characteristics of the internet connection and the ECOMS-UDG traffic load at the moment of accessing the data. Thus, if the data request takes too long, we strongly advice to simplify the requested dataset and try to divide the job into smaller queries. == Basic loading examples The ecomsUDG.Raccess package has been built using a (Linux) 32-bit OS, as well as all examples and time estimates. Thus, the performance may vary significantly depending on the aforementioned factors. As a rule of thumb, this would be a recommended usage of the loadECOMS function: * [wiki:./continentalSelection EXAMPLE 2: Regional-Continental Domain Selections]: Depending on the size of the spatial window, it may be possible to access all members, but preferably a few members should be selected, and time spans no longer than one decade. {{{#!comment * [wiki:./globalSelection EXAMPLE 3: Global Domain Selections]: It is recommended that in this case single-member, single-year selections are done. }}} In the particular case of global domain selections (lonLim and latLim arguments set to NULL) for forecast data, it is recommended that only single-member, single-year selections are performed, due to the large size of this type of requests. Note that this is just an approximate recommendation. Object sizes also depend on the spatial resolution (CFS has approximately 1º horizontal res., while System4 is 0.75º and WFDEI 0.5º). Similarly, while GCM data will normally return data for the whole Earth (including oceans) for most variables, many observational datasets (like WFDEI) provide only data for land areas. In the particular case of global domain selections (lonLim and latLim arguments set to NULL), it is recommended that only single-member, single-year selections are performed, due to the large size of this type of requests. Note that this is just an approximate recommendation. Object sizes also depend on the spatial resolution (CFS has approximately 1º horizontal res., while System4 is 0.75º and WFDEI 0.5º). Similarly, while GCM data will normally return data for the whole Earth (including oceans) for most variables, many observational datasets (like WFDEI) provide only data for land areas. == Additional examples {{{#!comment = Additional examples * [wiki:./globalSelection EXAMPLE 3: Calculating multi-member bias]: A worked example on how to compute the bias of several members of a forecast (CFS) against an observed reference (WFDEI)