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[Support #BBK-486187]: WMS through THREDDs with stippling

Hi Caspar,

> We use WMS from a THREDDs server for assembling and presenting climate
> change maps on our portals in NCAR-RAL and for client portals (WorldBank,
> PAGASA-Philiippines Met Service, Bahrain, …). Services work smoothly and
> are extremely helpful.
> 
> Now we would like to upgrade our presentations by indicating where the
> projected climate changes are significant. We want to do this via
> stippling (see example graph below). What would you suggest is the best
> way to get shippling through WMS? We store the information in separate
> netCDF files, one for the climate field and one with the same grid but
> with integer information 0,1 intended for stippling. While we can generate
> color layers, we can’t seem to find pointers to layer formats that would
> reflect stippling. Are we on the wrong track doing this in WMS?
> 
> Would you be able to point us in a good direction?

The WMS implementation used in THREDDS is ncWMS [1]. The “Uncertainty Data” 
section [2] of the ncWMS documentation discusses support for stippling to 
visualize uncertainty data (see the “uncert-stippled” style at the end of that 
section). The “EDAL SLD Specification” appendix [3] has two sections on 
stippling [4, 5] but again it appears focused on visualizing uncertainty data.

I'm not finding anything about stippling to visualize mask data as it sounds 
you wanting to do. You might ask on the ncWMS issues page [6] if there is 
support for that functionality.

I hope that helps.
Cheers,

Ethan

[1] https://reading-escience-centre.gitbooks.io/ncwms-user-guide/content/
[2] 
https://reading-escience-centre.gitbooks.io/ncwms-user-guide/content/05-data_formats.html#uncertain
[3] 
https://reading-escience-centre.gitbooks.io/edal-user-guide/content/appendices/sld_spec/introduction.html
[4] 
https://reading-escience-centre.gitbooks.io/edal-user-guide/content/appendices/sld_spec/xml_description/patterns.html
[5] 
https://reading-escience-centre.gitbooks.io/edal-user-guide/content/appendices/sld_spec/xml_usage/stippling.html
[6] https://github.com/Reading-eScience-Centre/ncwms/issues


> Many thanks!
> 
> Caspar


Ticket Details
===================
Ticket ID: BBK-486187
Department: Support THREDDS
Priority: Normal
Status: Open
===================
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