| Re: Grid Transformation to a new grid [message #58709] |
Tue, 12 February 2008 03:37 |
Spon
Messages: 178
Registered: September 2007
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Senior Member |
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On Feb 12, 11:23 am, david <da...@grahi.upc.es> wrote:
> Hi,
> I use this one to interpol with nearest_neighbour:
> z_Data_limits=GRIDDATA(xutm_i(0:num_gates_max-1,*),yutm_i(0: num_gates_max-1,*),
> $
>
> z_data(0:num_gates_max-1,*,k,i),METHOD='NearestNeighbour'),T RIANGLES=tri....)
>
> Is this what you want?
>
> Cheers!
>
> capmail79-goo...@yahoo.de wrote:
>> Hello Everybody!
>
>> I want to transpose 3D Radar values from an irregular grid to a
>> definable 3D grid. Since I could not find any function for the 3D
>> problem I tried the function trigrid for 2D grids, which works very
>> well for the middle area of my domain, but does only poorly replicate
>> the radar echoes on the edges. I assume, this is due to the
>> interpolation of the values, which happens within the function.
>
>> If I could have the source code of the function trigrid, i could
>> possibly adapt it to my problem, but i could not find that.
>
>> So I tried to find a function which just takes the value of the
>> nearest neighbour and writes it on the new grid, without any
>> interpolation. I did not succeed here, too.
>
>> Does anybody know a program for my problem or where I can get the
>> source code of the function trigrid? Or even better, it would be
>> great, if there is a program which could handle the grid
>> transformation problem quickly and efficiently on a 3D grid!
>
>> Thanks, very much!
>
>> Vera
Take a look at the QHULL and QGRID3 functions, particularly Example 3
in the QGRID3 help file. Seems to me this might give you what you
want.
All the best,
Chris
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| Re: Grid Transformation to a new grid [message #58710 is a reply to message #58709] |
Tue, 12 February 2008 03:23  |
david[4]
Messages: 5
Registered: January 2008
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Junior Member |
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Hi,
I use this one to interpol with nearest_neighbour:
z_Data_limits=GRIDDATA(xutm_i(0:num_gates_max-1,*),yutm_i(0: num_gates_max-1,*),
$
z_data(0:num_gates_max-1,*,k,i),METHOD='NearestNeighbour'),T RIANGLES=tri....)
Is this what you want?
Cheers!
capmail79-google@yahoo.de wrote:
> Hello Everybody!
>
> I want to transpose 3D Radar values from an irregular grid to a
> definable 3D grid. Since I could not find any function for the 3D
> problem I tried the function trigrid for 2D grids, which works very
> well for the middle area of my domain, but does only poorly replicate
> the radar echoes on the edges. I assume, this is due to the
> interpolation of the values, which happens within the function.
>
> If I could have the source code of the function trigrid, i could
> possibly adapt it to my problem, but i could not find that.
>
> So I tried to find a function which just takes the value of the
> nearest neighbour and writes it on the new grid, without any
> interpolation. I did not succeed here, too.
>
> Does anybody know a program for my problem or where I can get the
> source code of the function trigrid? Or even better, it would be
> great, if there is a program which could handle the grid
> transformation problem quickly and efficiently on a 3D grid!
>
> Thanks, very much!
>
> Vera
>
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