Changes between Version 1 and Version 2 of qxfcsml


Ignore:
Timestamp:
20/04/07 12:59:58 (13 years ago)
Author:
domlowe
Comment:

Added Roy's comment (and more comments from me)

Legend:

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  • qxfcsml

    v1 v2  
    77774. '''Weird  cdms 'bug'.''' 
    7878We did some tests using cdtime to convert the QXF time values to full component times, and one of them produced this odd result: 
    79 >>> import cdtime 
    80 >>> t=cdtime.reltime(77431.04166666, "days since 1760-1-1") 
    81 >>> t.tocomp() 
    82 1972-1-1 0:59:60.0 
    8379 
     80{{{ 
     81#!python 
     82import cdtime 
     83t=cdtime.reltime(77431.04166666, "days since 1760-1-1") 
     84t.tocomp() 
     85 
     86>>> 1972-1-1 0:59:60.0 
     87}}} 
    8488surely this should be: 
    85 1972-1-1 1:00:00.0  
     891972-1-1 1:00:00.0  ? 
    8690 
    8791Dom to investigate.  
     
    9094Is it likely to be problematic that BODC is working from the 18th century as reference point? 
    9195Are there limitations in cdtime we should know about? 
     96 
     97Roy comment: ''BODC has data going back to the 19th century.  Hence our choice of time base. Instinct tells me this might be a problem if the cdms time base is 1979 - or are negative times handles correctly/transparently.'' 
     98 
     99Dom comment: ''Not sure I'll look into this.''  
    92100 
    931016. '''Bounding boxes:''' 
     
    108116</limits> 
    109117 
    110 7. '''What is low and what is high?''' I know we've discussed this before, but I'm not sure we've agreed on conventions in CSML for the directions of up and down relating to depths. (edited from original discussion note where there was a mistake). 
     118Roy comment: ''Potentially 'growing' bounding boxes due to type transforms by up to 2 degrees worries me.'' 
     119Dom comment: ''The alternative could be to define a csml:GridEnvelope which accepts floats, but I'm not sure if this would break the schema from a gml point of view? Andrew?''  
     120 
     1217. '''What is low and what is high?''' I know we've discussed this before, but I'm not sure we've agreed on conventions in CSML for the directions of up and down relating to depths. (edited from original discussion note where I had an incorrect grid envelope as an example. 
     122 
     123Roy comment: ''Oceanographers have depth bred into them, but for MOLES we agreed that depths should be considered as negative heights and I suggest CSML follows the same convention.  Trouble is what to do when the z co-ordinate is expressed in terms in units of pressure.....''