source: TI02-CSML/trunk/csml/API/ops_GridSeriesFeature.py @ 2112

Subversion URL: http://proj.badc.rl.ac.uk/svn/ndg/TI02-CSML/trunk/csml/API/ops_GridSeriesFeature.py@2112
Revision 2112, 3.7 KB checked in by domlowe, 12 years ago (diff)

units and missing values now working properly in subsetgridseries

Line 
1''' ops_GridSeriesFeature  contains operations for GridSeriesFeatures'''
2
3import csml.parser
4import csml.csmllibs.csmltime
5import csml.csmllibs.csmldocument
6import csml.API.ops_AbstractFeature
7import csml.API.genSubset
8import csml.csmllibs.netCDFWriter
9import csmlutils
10
11
12import sys  #remove later
13
14def testmethod(self):
15    #print 'testmethod for gridseries feature'
16    return 'testmethod - gridseries'
17
18def getAllowedSubsettings(self):
19    return ['subsetToGridSeries']  #other operations
20
21def getDomain(self):
22    #returns domain as a dictionary of ordinates {name: [values], ...}
23    self.domain={}
24    for gridOrd in self.value.gridSeriesDomain.coordTransformTable.gridOrdinates:
25        name=gridOrd.coordAxisLabel.CONTENT
26        if hasattr(gridOrd.coordAxisValues, '__insertedExtract'):
27            self.domain[name], fill=gridOrd.coordAxisValues.__insertedExtract.getData()
28        else:
29            vals=gridOrd.coordAxisValues.coordinateList.CONTENT
30            valList=[]
31            for val in vals.split(): 
32                valList.append(val)
33            self.domain[name]=valList
34    return self.domain
35
36   
37def subsetToGridSeries(self, csmlpath=None, ncpath=None,**kwargs):
38    #set self.domain:
39    self.getDomain()
40   
41    #get the CRS from a  the  catalogue
42    cat=csml.csmllibs.csmlcrs.CRSCatalogue()
43    crs=cat.getCRS(self.value.gridSeriesDomain.srsName) 
44   
45    #non-feature specific setup code, mainly handles the time dimension/calendar
46    pathToSubsetNetCDF, kwargs, timeName, calunits, caltype, times=csml.API.genSubset.genericSubset(self, csmlpath, ncpath, self.domain, kwargs)
47     
48    #Find the original time name (timeAxis) for the file.
49    for gridOrd in self.value.gridSeriesDomain.coordTransformTable.gridOrdinates:
50        if gridOrd.coordAxisLabel.CONTENT==timeName:
51            timeAxis = gridOrd.gridAxesSpanned.CONTENT  #only works for regular grids atm
52        else: 
53            print 'crs not supported'
54 
55    ##Get names of variables in file and relate them to the subset selection
56    selection={}
57    for gridOrd in self.value.gridSeriesDomain.coordTransformTable.gridOrdinates:
58        selection[gridOrd.gridAxesSpanned.CONTENT]=kwargs[gridOrd.coordAxisLabel.CONTENT]
59   
60   
61    strTimes, axisorder, units, fulldata, fillvalue =csml.API.genSubset.getTheData(self, selection, times, timeName)
62   
63   
64    #Okay, got the data now. Need to write CSML feature and NetCDF files.
65    #Writing out the CSML feature
66   
67    # define domain/coverage  to use in 'value' attribute   
68    newdomain=csml.parser.GridSeriesDomain()
69    domainSubset, totalArraySize=csml.API.genSubset.subsetDomain(timeName,strTimes,self.domain, **kwargs)
70    cTT=csml.API.genSubset.getCoordTransformTable(domainSubset, crs)
71    newdomain.coordTransformTable=cTT
72    rangeSet=csml.parser.RangeSet()
73    rangeSet.arrayDescriptor=csml.parser.NetCDFExtract(id=self.id,fileName=csml.parser.csString(pathToSubsetNetCDF),variableName=csml.parser.csString(self.id),arraySize=csml.parser.csString(totalArraySize))
74   
75    #gridseries coverage
76    cvg=csml.parser.GridSeriesCoverage()
77    cvg.rangeSet=rangeSet
78    cvg.gridSeriesDomain=newdomain   
79    csmlWrap=csml.csmllibs.csmlfeaturewrap.CSMLWrapper()
80   
81    #create a stand alone gridseries feature containing this coverage
82    subsettedFeature=csmlWrap.createGridSeriesFeature(value=cvg,featureID=self.id,description=self.description)
83 
84   
85    ### write netcdf using NCWriter class (wraps cdms) ###
86    nc=csml.csmllibs.netCDFWriter.NCwriter(pathToSubsetNetCDF)
87    ords=cTT.gridOrdinates
88    nc.genWriteVar(self.id,ords, times, calunits, caltype, axisorder, units, fulldata, fillvalue)
89    nc.closeFinishedFile()
90   
91    return subsettedFeature, pathToSubsetNetCDF
92   
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