Changes between Version 16 and Version 17 of udg/ecoms/RPackage/homogeneization

Timestamp:

Mar 9, 2015 6:14:10 PM (7 years ago)

Author:

juaco

Comment:

--

udg/ecoms/RPackage/homogeneization

@@ -99 +99 @@
  * `interface`: this is a internal value used by the loading functions.
 
-'''Example''': Suppose we have daily temperature data, each record associated to a date (e.g. 19780420 for 20th April 1978). The lower time bound in this case is 0, and the upper time bound 24, indicating that the verification period of the value starts 20 April 1978 at 00:00 and ends 20 April 1978 23:59:59 (i.e., the time interval {{{[19780420, 19780421)}}}. Because it is mean temperature, the `cell_method` for this variable is "mean". If the same record has a time associated at 12:00 rather than 00:00 (i.e. 20 April 1978 at 12:00), then the lower and the upper time bounds would be 12.
+'''Example''': Suppose we have daily temperature data, each record associated to a date (e.g. 19780420 for 20th April 1978). The lower time bound in this case is 0, and the upper time bound 24, indicating that the verification period of the value starts 20 April 1978 at 00:00 and ends 20 April 1978 23:59:59 (i.e., the time interval {{{[19780420, 19780421)}}}. Because it is mean temperature, the `cell_method` for this variable is "mean". 
 
+If the same record has a time associated at 12:00 rather than 00:00 (i.e. 20 April 1978 at 12:00 UTC), then the lower and the upper time bounds would be defined at -12 and +12 respectively. Similarly, if the variable is instantaneous rather than a daily mean (e.g. instantaneous temperature at 00:00 UTC) the `cell_method` would correspond to "none", and both the lower and upper time bounds would be equal to 0).