[thredds] TDS WMS returns blank images

Aloha TDS Community,
When testing our TDS WMS results in various clients, I find that the images are 
always blank (all white) regardless of what variable or palette I've tried thus 
far. I've only been using the default palettes that come with TDS. My suspicion 
is that the TDS WMS is not configured by default to scale the data values of 
the variable from 0-255?, and that the default palettes are therefore 
inapplicable to my data as a result. For instance, if my variable has values 
ranging from -1.0 to +1.0, then a palette defining colors that expect values 
ranging 0-255 won't help. 

If this is true, then I can define my own palette and specify this in 
threddsConfig.xml. But is there a way to set the palette on a dataset and/or 
variable basis?, or will this palette appear for all datasets served through my 
TDS?

Lastly, is there some way to tell the TDS WMS to scale the values to 0-255 in 
ogcMetaXML?, and can you specify what range of values to scale to 0-255 (i.e. 
leaving out a no-data value like -999, etc.)?

Mahalo!,
John
---
John Maurer
HiOOS Data System Administrator
School of Ocean and Earth Science and Technology
University of Hawaiʻi at Mānoa
808.956.0227
http://www2.hawaii.edu/~jmaurer


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