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20050816: IDV version 1.2 available for download

>From: "Valentijn Venus" <address@hidden>
>Organization: ITC
>Keywords: 200508152235.j7FMZdjo011711  IDV images

Hi Valentijn-

I apologize for the delay in responding.  This took me a bit longer
to figure out than I thought (I'm not the best Jython writer).

>When running the following script on multiple pairs of image (see =
>attached screendump) from adde.ucar.edu dataset: RTIMAGES:=20
>
>def addImages (a,b):
>  lineValuesA =3D a.getFloats()
>  lineValuesB =3D b.getFloats()
>  for i in xrange(a.getDomainSet().getLength()):
>    value =3D lineValuesA[0][i] - lineValuesB[0][i]
>    lineValuesA[0][i] =3D value*i
>  newd =3D a.clone()
>  newd.setSamples(lineValuesA)
>  return newd
>
>I get: "An error has occurred: ControlDescriptor.Creating display
> org.python.core.PyException
>
>
>Traceback (innermost last):
>  File "<string>", line 1, in ?
>  File "<string>", line 8, in addImages
>AttributeError: __getitem__"
>
>This happens with any ADDE dataset, but works fine as long as single =
>images (i.e. one pair) are selected.

The basic problem is that you get two different objects depending on
whether you ask for a set of images or a single image.  When you 
request a sequence of images, the getFloats() end up returning
a null array, thus the error.

So, to handle either case, I wrote the following procedure and call
it:

def addImageSequences(a,b):
  import ucar.unidata.data.grid.GridUtil as gu
  if (gu.isTimeSequence(a)):
     newA = a.clone()
     for t in range(a.getDomainSet().getLength()):
         print "t = ", t
         subA = a.getSample(t)
         subB = b.getSample(t)
         newA.setSample(t,addImages(subA, subB))
     return newA
  else:
     return addImages(a,b)

>
>>>Can we participate as alpha/beta testers?
>>What modifications would you like to do?
>
>>Add some solar and satellitte angle calculation fucntions....

These should be easy to add.  Formulas are defined in derived.xml
and enduserformulas.xml in the /ucar/unidata/idv/resources directory.
You can see there that they can call either Jython procedures or
Java methods.  For hard work, you might want to write some java code,
but a lot of this can be done in Jython.

>>We don't really have a mechanism for sharing code at this point and
>>have to figure out how we could do this most easily.  I'll discuss
>>this with others here and see what we can come up with.=20
>
>Are you developing using Eclipse too?

No. I use vi.

Don
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