source: TI02-CSML/trunk/csml/API/ops_GridSeriesFeature.py @ 2155

Subversion URL: http://proj.badc.rl.ac.uk/svn/ndg/TI02-CSML/trunk/csml/API/ops_GridSeriesFeature.py@2155
Revision 2155, 3.9 KB checked in by domlowe, 14 years ago (diff)

Nudge to nearest neighbour function added to enable approximate requests for data - thanks Ag

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, axisorder, units=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
37   
38def subsetToGridSeries(self, csmlpath=None, ncpath=None,**kwargs):
39       
40    #set self.domain:
41    self.getDomain()     
42   
43    #if request doesn't match domain points find nearest neighbours
44    kwargs=csml.API.genSubset.checkNeighbours(self.domain, **kwargs)
45   
46    #get the CRS from a  the  catalogue
47    cat=csml.csmllibs.csmlcrs.CRSCatalogue()
48    crs=cat.getCRS(self.value.gridSeriesDomain.srsName) 
49   
50    #non-feature specific setup code, mainly handles the time dimension/calendar
51    pathToSubsetNetCDF, kwargs, timeName, calunits, caltype, times=csml.API.genSubset.genericSubset(self, csmlpath, ncpath, self.domain, kwargs)
52     
53    #Find the original time name (timeAxis) for the file.
54    for gridOrd in self.value.gridSeriesDomain.coordTransformTable.gridOrdinates:
55        if gridOrd.coordAxisLabel.CONTENT==timeName:
56            timeAxis = gridOrd.gridAxesSpanned.CONTENT  #only works for regular grids atm
57        else: 
58            print 'crs not supported'
59 
60    ##Get names of variables in file and relate them to the subset selection
61    selection={}
62    for gridOrd in self.value.gridSeriesDomain.coordTransformTable.gridOrdinates:
63        try:
64            selection[gridOrd.gridAxesSpanned.CONTENT]=kwargs[gridOrd.coordAxisLabel.CONTENT]
65        except KeyError:
66            allValues=tuple(self.domain[gridOrd.coordAxisLabel.CONTENT])
67    strTimes, axisorder, units, fulldata, fillvalue =csml.API.genSubset.getTheData(self, selection, times, timeName)
68   
69   
70    #Okay, got the data now. Need to write CSML feature and NetCDF files.
71    #Writing out the CSML feature
72   
73    # define domain/coverage  to use in 'value' attribute   
74    newdomain=csml.parser.GridSeriesDomain()
75    domainSubset, totalArraySize=csml.API.genSubset.subsetDomain(timeName,strTimes,self.domain, **kwargs)
76    cTT=csml.API.genSubset.getCoordTransformTable(domainSubset, crs)
77    newdomain.coordTransformTable=cTT
78    rangeSet=csml.parser.RangeSet()
79    rangeSet.arrayDescriptor=csml.parser.NetCDFExtract(id=self.id,fileName=csml.parser.csString(pathToSubsetNetCDF),variableName=csml.parser.csString(self.id),arraySize=csml.parser.csString(totalArraySize))
80   
81    #gridseries coverage
82    cvg=csml.parser.GridSeriesCoverage()
83    cvg.rangeSet=rangeSet
84    cvg.gridSeriesDomain=newdomain   
85    csmlWrap=csml.csmllibs.csmlfeaturewrap.CSMLWrapper()
86   
87    #create a stand alone gridseries feature containing this coverage
88    subsettedFeature=csmlWrap.createGridSeriesFeature(value=cvg,featureID=self.id,description=self.description)
89 
90   
91    ### write netcdf using NCWriter class (wraps cdms) ###
92    nc=csml.csmllibs.netCDFWriter.NCwriter(pathToSubsetNetCDF)
93    ords=cTT.gridOrdinates
94   
95    nc.genWriteVar(self.id,ords, times, calunits, caltype, axisorder, units, fulldata, fillvalue)
96    nc.closeFinishedFile()
97   
98    return subsettedFeature, pathToSubsetNetCDF
99   
Note: See TracBrowser for help on using the repository browser.