Re: [thredds] thredds WMS vector wind layer alone without velocity image

Hi Ivan –

THREDDS uses a NcWMS ( plugin as the WMS 
server.  Code has been written to generate the ‘barb’ plots you are speaking 
about in NcWMS, but it has not found its way back into the NcWMS codebase and 
from there into a THREDDS release.

If you are comfortable installing NcWMS outside of THREDDS, you can use this 
WAR file (rename to ncwms.war before deploying) to get additional vector and 
barb styles:

You can also wait out the integration back into THREDDS if you don’t have an 
immediate need for the styles.  I believe the new styles will be available in 
the first release of TDS 4.3.

If you have any questions please let me know,


Side note: There have been reports that the new vector and barb styles take 
almost twice as long to generate than the original styles.

From: thredds-bounces@xxxxxxxxxxxxxxxx 
[mailto:thredds-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Ivan Price
Sent: Wednesday, September 26, 2012 5:13 AM
To: thredds@xxxxxxxxxxxxxxxx
Subject: [thredds] thredds WMS vector wind layer alone without velocity image

Hi there,

We are using the excellent wind direction auto-variable feature of THREDDS, 
whereby after defining our ‘eastward_wind’ and ‘northward_wind’ we are able to 
get the direction and strength map via the layer ‘wind’.

my question:   we have seen we can ask for the map in various styles, affecting 
the colour palette and scale of the underlying wind velocity image. we would 
like to know if it is possible to remove altogether the underlying image, 
leaving only the wind direction arrows. I have thought about defining a palette 
with only a single transparent colour, but I’m not sure if that is possible as 
the palettes don’t seem to support alpha values.

And perhaps in the same question if anyone has ever investigated having the 
arrows to reflect the wind velocity in the typical ‘quiver’ type way.. this has 
probably been discussed before but I can’t find any reference.

thanks and regards

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