[Paraview] Wind Velocity does not match cloud movement

[Moreland, Kenneth]

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 <paraview-bounces at paraview.org> on behalf of Henry Lau <henrylau9677 at gmail.com>
Date: Friday, April 21, 2017 at 6:35 PM
To: "paraview at paraview.org" <paraview at paraview.org>
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
[cid:image001.png at 01D2BAF6.F2C7B0A0]
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/paraview/attachments/20170422/1fbc8749/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 398559 bytes
Desc: image001.png
URL: <http://public.kitware.com/pipermail/paraview/attachments/20170422/1fbc8749/attachment-0001.png>