[idvdevelopers] sample at user-specified lat/lon in a 2D grid

Hi,

I'm trying to sample at user-specified lat/lon in a 2D grid. Any ideas
to enhance as indicated in the comments below:
 
def getValueAtLocation(fieldimpl) :
  """Extract a value from a 3D grid at "Location." Enhance so it will
work
     On 2D gridded datasets too 
     level is a makeEarthLocation; must be appropriate for the grid.
     param fieldimpl is a grid which may have one or more time steps.
"""
 
  from ucar.unidata.idv.control.DisplayControlBase import
makeEarthLocation
  location = makeEarthLocation(10.000, 104.0, 0) 
  # lat/lon/alt should be supplied as a field of points loaded as csv
using
  # the visad text-adaptor/ESRI shapefile
 
  print location
  ff = GridUtil.sample(fieldimpl, location) 
  # works NOT on a 2D grid (only on 3D), is there an equivalent for
2D's?
  print ff # works
  return ff # return doesn't work yet, why?

Cheers, Tyn
International Institute for Geo-Information Science and Earth Observation (ITC)
Chamber of Commerce: 410 27 560

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