Changes between Version 3 and Version 4 of Dev/NetcdfFormat

Timestamp:

May 17, 2016, 2:19:18 PM (9 years ago)

Author:

Dimitar Misev

Comment:

—

Dev/NetcdfFormat

@@ -197 +197 @@
 }}}
 
-The values are identically ordered. Problems:
+The values are identically ordered, so there is no issue with the data export.
+
+Problems:
 - the nodata value is not properly set
 - all metadata is lost
 - dimension and data variable names are lost
-- dimension variables are lostt
+- dimension variables are lost
+
+
+== Preserving metadata at export ==
+
+The stuff that need to be preserved, in addition to the variable data (of variable '''tos''' for example):
+- global metadata:
+{{{
+// global attributes:
+                :title = "IPSL  model output prepared for IPCC Fourth Assessment SRES A2 experiment" ;
+                :institution = "IPSL (Institut Pierre Simon Laplace, Paris, France)" ;
+                :source = "IPSL-CM4_v1 (2003) : atmosphere : LMDZ (IPSL-CM4_IPCC, 96x71x19) ; ocean ORCA2 (ipsl_cm4_v1_8, 2x2L31); sea ice LIM (ipsl_cm4_v" ;
+                :contact = "Sebastien Denvil, sebastien.denvil@ipsl.jussieu.fr" ;
+                :project_id = "IPCC Fourth Assessment" ;
+                :table_id = "Table O1 (13 November 2004)" ;
+                :experiment_id = "SRES A2 experiment" ;
+                :realization = 1 ;
+                :cmor_version = 0.96f ;
+                :Conventions = "CF-1.0" ;
+                :history = "YYYY/MM/JJ: data generated; YYYY/MM/JJ+1 data transformed  At 16:37:23 on 01/11/2005, CMOR rewrote data to comply with CF standards and IPCC Fourth Assessment requirements" ;
+                :references = "Dufresne et al, Journal of Climate, 2015, vol XX, p 136" ;
+                :comment = "Test drive" ;
+}}}
+- variable metadata
+{{{
+                tos:standard_name = "sea_surface_temperature" ;
+                tos:long_name = "Sea Surface Temperature" ;
+                tos:units = "K" ;
+                tos:cell_methods = "time: mean (interval: 30 minutes)" ;
+                tos:_FillValue = 1.e+20f ;
+                tos:missing_value = 1.e+20f ;
+                tos:original_name = "sosstsst" ;
+                tos:original_units = "degC" ;
+                tos:history = " At   16:37:23 on 01/11/2005: CMOR altered the data in the following ways: added 2.73150E+02 to yield output units;  Cyclical dimension was output starting at a different lon;" ;
+}}}
+- 1D dimension variables of the dimensions of tos (time, lat, lon in the example), and their associated metadata:
+{{{
+        double lon(lon) ;
+                lon:standard_name = "longitude" ;
+                lon:long_name = "longitude" ;
+                lon:units = "degrees_east" ;
+                lon:axis = "X" ;
+                lon:bounds = "lon_bnds" ;
+                lon:original_units = "degrees_east" ;
+        double lat(lat) ;
+                lat:standard_name = "latitude" ;
+                lat:long_name = "latitude" ;
+                lat:units = "degrees_north" ;
+                lat:axis = "Y" ;
+                lat:bounds = "lat_bnds" ;
+                lat:original_units = "degrees_north" ;
+        double time(time) ;
+                time:standard_name = "time" ;
+                time:long_name = "time" ;
+                time:units = "days since 2001-1-1" ;
+                time:axis = "T" ;
+                time:calendar = "360_day" ;
+                time:bounds = "time_bnds" ;
+                time:original_units = "seconds since 2001-1-1" ;
+}}}
+- further variables that seem to look like dimension variables?
+{{{
+        double lat_bnds(lat, bnds) ;
+        double time_bnds(time, bnds) ;
+}}}
+
+This information should be modeled in json format and given as format parameters to the encode function.