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

  • To: Valentijn Venus <venus@xxxxxx>
  • Subject: Re: [idvdevelopers] sample at user-specified lat/lon in a 2D grid
  • From: Don Murray <dmurray@xxxxxxxxxxxxxxxx>
  • Date: Fri, 28 Nov 2008 09:18:07 -0700
Hi Tijn-
The sample on a 2D grid takes a LatLonPoint and you are passing in an EarthLocation. you can call: 

location.getLatLonPoint()

to get the LatLon position.

Don


Valentijn Venus wrote:

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
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Don Murray                               UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx                        P.O. Box 3000
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