[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[THREDDS #XIG-399067]: default colorScaleRange for WMS within the TDS?



On 6/2/2010 7:46 AM, Jon Blower wrote:
>> John Caron wrote:
>> 1. what does ncWms currently do for default? Use data min/max?
> 
> No - ncWMS uses a separate config file, which the sysadmin edits
> manually or through a web GUI.  This allows configuration
> per-variable.
> 
> I think this is a separate issue from data min/max - this is a
> *suggested* scale, which doesn't need to be precise.


On 6/2/2010 3:03 PM, Jon Blower wrote:
>> John Caron wrote:
>> what does the system do if the admin doesnt set a value
>> for that dataset?
> 
> ncWMS scans each dataset when it's first loaded into the system
> and makes a test extraction of a chunk of data from the first
> timestep and first z level from each variable.  Then it finds
> the min and max of this data subset, adding 10% at top and
> bottom.  It's far from perfect but it at least gives a reasonable
> guess, which the sysadmin can override if it turns out to be a
> bad choice.
> 
> If that doesn't work for any reason, ncWMS applies the default
> range [-50:50].  But this doesn't happen very often.
> 
> The estimated scale ranges are persisted to the ncWMS config
> file so they don't have to be recalculated when the server is
> rebooted.
> 
> I guess this approach would be difficult to apply in TDS, where
> the data catalogs could be very big.
> 
> Jon


Ticket Details
===================
Ticket ID: XIG-399067
Department: Support THREDDS
Priority: Urgent
Status: Open


NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.