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

Nice!

A followup question to this. For most non lat/lon grids in grib format, the u/v vector components are grid relative. Are they converted to true n/s vectors before being rendered?

Don

On 9/26/12 8:08 AM, Marcos Hermida wrote:
Hi Ivan, Kyle,

actually, we have already integrated the new arrow styles in our current
development version: 4.3.13 (available here:
ftp://ftp.unidata.ucar.edu/pub/thredds/4.3/current/thredds.war)
Those styles are not declared into the WMS capabilities document yet and
are: barb, stumpvec, trivec, linevec, fancyvec and you can use them in
the same fashion you use the vector style, so in the styles param of the
WMS request instead of using vector/boxfill you can use barb/boxfill and
so on.
I've attached some images with examples so you can see how those styles
look like.
Hope this helps.

Cheers!

On 09/26/2012 08:00 AM, Kyle Wilcox wrote:

Hi Ivan –

THREDDS uses a NcWMS (http://www.resc.rdg.ac.uk/trac/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:
https://github.com/downloads/asascience-open/ncWMS/ncWMS-20120601.war.

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,

Kyle

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

-ivan

NOVELTIS



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--
Don Murray
NOAA/ESRL/PSD and CIRES
303-497-3596
http://www.esrl.noaa.gov/psd/people/don.murray/