Re: [visad] Transformation and/or resampling

• To: visad@xxxxxxxxxxxxxxxx
• Subject: Re: [visad] Transformation and/or resampling
• From: Tom Rink <rink@xxxxxxxxxxxxx>
• Date: Tue, 21 Jan 2014 08:49:50 -0600

Hi Stefan,

screen and display coordinates.

Tom

On 1/21/14 4:02 AM, Ghansham Sangar wrote:

Hi Stefan


There is a better solution...

Check flatfield.resample() method.

The flatfield that you extract from fieldimpl, you can call this method for that flatfield.

This method take the domainSet of the target field.


regards
Ghansham



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    1. Re: Transformation and/or resampling (Stefan Below)


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Message: 1
Date: Mon, 20 Jan 2014 14:23:18 +0100
From: Stefan Below<stefanbelow@xxxxxx>
To: visad@xxxxxxxxxxxxxxxx
Subject: Re: [visad] Transformation and/or resampling
Message-ID:<52DD2346.4030907@xxxxxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi,

thanks for your hint. So i have to iterate over all sequence and check
if there is a point near my coordinate. After that, i have to check
which result is the nearest, right?
Or is there a better solution?

I try to clarify my question:
1b) convet a flat field with the the mathtype
(time->(lat,lon)->temperature) to (lat,lon)->temperature (convert the
data to a linear grid)

2) How can i calculate the clipping parameter? I need a user defined
clipping area. So how can i calculate from an axis value (like x=70) to
the clipping parameter X_POS and/or X_NEG?
dr.setClip(0, true,  1.0f,  0.0f,  0.0f, -1.01f);  // X_POS face
dr.setClip(1, true, -1.0f,  0.0f,  0.0f, -1.01f);  // X_NEG face

Thanks a lot,
Stefan Below




On 18.01.2014 10:29, Ghansham Sangar wrote:

Hi Stefan


Regarding point 1, the visad data object corresponding to the function
type that you mentioned
is a FieldImpl. You can extract the flatfield with the FunctionType
((lat,lon)->Temperature)
by using following FieldImpl method:
data.getSample(0);
It will get you the first flatfield (or let say first image) in the
sequence.

Regarding second one, I am not able to understand the query exactly.


ghansham


On 01/18/2014 12:30 AM, visad-request@xxxxxxxxxxxxxxxx wrote:

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Today's Topics:

     1. Transformation and/or resampling (Stefan Below)


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Message: 1
Date: Fri, 17 Jan 2014 11:54:08 +0100
From: Stefan Below<stefanbelow@xxxxxx>
To: visad@xxxxxxxxxxxxxxxx
Subject: [visad] Transformation and/or resampling
Message-ID:<52D90BD0.60807@xxxxxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi,

i have some question about data transformation or resampling.

1) I have some data that are defined like this
(time->(lat,lon)->temperature).
           a) Is it possible to transform/resample the data to
(lat,lon)->temperature?
               (The result should be a n x m grid with temperature
values.

           b) I want to get the value information for a specific
coordinate (in  this case lat/lon).
               field.evaluate(LatLonRealtupleType) is not working,
because
of the wrong mathtype.

2) I'am using screenbased axis with TwoDDisplayRendererJ3D . Now i want

to set the clipping area to the bounds of the screen based axis. But i
have no clue how to calculate the clipping area. For testing, i tried
to use the cursor position as a clipping boundary.

double[] cursor = getCursor();
float tmpXMAX=(float)cursor[0];
tmpXMAX=1-(tmpXMAX-1);
setClip(0, true, tmpXMAX, 0.0f, 0.0f, -1.0f);

But it is not working as aspected. The boundary is only correct if the

cursor is exactly over the right side of the box (cursor position = 1). I think i missed some kind of transformation. Maybe someone can give me

a hint.

Thanks a lot
Stefan Below



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• Follow-Ups:
  • Re: [visad] Transformation and/or resampling
    • From: Stefan Below

• References:
  • Re: [visad] Transformation and/or resampling
    • From: Ghansham Sangar