Hi Ken,

The thing is, the clouds are distorted if I switched off the “Spherical 
Coordinates”, and the output shape looks something like a straight line. I 
attached the image for your reference.



Henry

> On 22 Apr 2017, at 6:28 AM, Moreland, Kenneth <[email protected]> wrote:
> 
> Are you reading your data in with the Generic/CF reader and with “Spherical 
> Coordinates” clicked on? If so, then the lat/lon/height coordinates are 
> transformed to a sphere in the Cartesian space and thus no longer align with 
> the x, y, and z axes.
>  
> -Ken
>  
>  
> From: ParaView <[email protected] 
> <mailto:[email protected]>> on behalf of Henry Lau 
> <[email protected] <mailto:[email protected]>>
> Date: Friday, April 21, 2017 at 6:35 PM
> To: "[email protected] <mailto:[email protected]>" 
> <[email protected] <mailto:[email protected]>>
> Subject: [EXTERNAL] [Paraview] Wind Velocity does not match cloud movement
>  
> Hi,
> 
> I was visualising my wind velocity using glyphs and cloud water content at 
> the same time. However, I notice that the direction where the clouds move do 
> not match the direction the glyphs pointing. 
> 
> Below are the steps how I create the output:
> The data is a netcdf file with wind variable array "ua" 
> (eastward_wind_speed), "va" (northward_wind_speed), and "wa" 
> (wind_vertical_velocity). 
> I used a cell_data_to_point_data filter to convert them into point data.
> Then I combined these 3 arrays using a Paraview calculator with the equation 
> iHat*ua + jHat*va + kHat*wa.
> Then do a glyph filter to visualise the wind velocity.
> 
> Attached image is the output I got.
> The blue isosurfaces are the cloud water content while the glyphs are the 
> wind velocity. The problem is, the clouds are moving to the left, which does 
> not match where the glyphs are pointing at.
> 
> What would be the possible reason for this error? 
> 
> TIA
> <image001.png>

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