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List:       mapserver-users
Subject:    Re: [mapserver-users] WMS services from a NetCDF file layer
From:       Bill Hudspeth <bhudspeth () edac ! unm ! edu>
Date:       2015-06-17 14:16:49
Message-ID: 1237189963.1057055.1434550609298.JavaMail.zimbra () edac ! unm ! edu
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After determining the data value range (min/max) with gdalinfo -stats for a specific \
layer, I have now tried both with no satisfactory results...

PROCESSING "SCALE=AUTO"
PROCESSING "SCALE=313.72549438477:425.49020385742"




----- Original Message -----
From: "Fabian Schindler" <fabian.schindler@eox.at>
To: "bhudspeth" <bhudspeth@edac.unm.edu>
Cc: mapserver-users@lists.osgeo.org
Sent: Tuesday, June 16, 2015 11:50:46 AM
Subject: Re: [mapserver-users] WMS services from a NetCDF file layer

For the PROCESSING "SCALE=<low>:<high>" option you have to replace the
<low> and <high> with the respective values (you can use gdalinfo -stats
to see what the minimum and maximum values of the image are).

Perhaps, you could transform your image on the command line using
gdal_translate with the respective "-scale" option and see what the
output is there.

Regards,
Fabian

On 16.06.15 18:01, Bill Hudspeth wrote:
> Thanks for your suggestion Fabian,
> 
> 
> I have tried both:
> PROCESSING "SCALE=<low>:<high>"
> PROCESSING "SCALE=AUTO"
> 
> but with no change....with outputformat set to jpeg, I get a white image, with \
> outputformat set to PNG, I get a very light grey image....but that is all! 
> Thanks, Bill
> 
> 
> ----- Original Message -----
> From: "Fabian Schindler" <fabian.schindler@eox.at>
> To: mapserver-users@lists.osgeo.org
> Sent: Monday, June 15, 2015 8:47:34 AM
> Subject: Re: [mapserver-users] WMS services from a NetCDF file layer
> 
> This is probably due to the fact that your raster values are beyond 255.
> Mapserver truncates this to 255 which interpreted as white on a
> greyscale. To correctly scale the values you can use band processing
> options:
> 
> PROCESSING "SCALE=<low>:<high>"
> 
> You can also use "AUTO" but that might result in strangely "tiled" images.
> 
> See:
> http://mapserver.org/input/raster.html#special-processing-directives
> 
> Regards,
> Fabian
> 
> On 15.06.15 16:04, William Hudspeth wrote:
> > Hello,
> > 
> > I am using mapserver to provide WCS and WMS services from individual
> > layers (and their constituent bands) contained in a CF-formatted NetCDF
> > file. I have successfully implemented WCS services, but am continuing to
> > have problems with WMS services. While calls to return a single raster
> > grid (derived from a NetCDF layer) as a WMS request returns a correctly
> > projected image, the image is entirely white, and does not seem to
> > correctly reinterpret original data values into a range of pixel color
> > values. I would appreciate any information on what I might be missing.
> > 
> > Thanks!
> > 
> > 
> > 
> > _______________________________________________
> > mapserver-users mailing list
> > mapserver-users@lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/mapserver-users
> > 
> 
> _______________________________________________
> mapserver-users mailing list
> mapserver-users@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> 
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