[mapserver-users] Mapserver 7.0 and NODATA setting

[Andrea Peri]

HI,

The question of NODATA processing command is not completelly clear afaik.
Infact I found a patch from warmerdam:

https://trac.osgeo.org/mapserver/ticket/2404

Where it speak explicitly of a PROCESSING "NODATA" setting.

>I would note that OFFSITE is still supported, and the usual PROCESSING "NODATA=OFF" >mechanism can be used to disable using GDAL level nodata.

A.


2015-08-18 9:28 GMT+02:00 Andrea Peri <aperi2007 at gmail.com>:
> Hi,
>
> I have a clearly response from the log.
>
> The nodata is unsupported for this kind of rasters.
>
>> LoadGDALImage(rt_sat.LC8191.rt.attuale): NODATA value -9999 in GDAL
>>file or PROCESSING directive largely ignored.  Not yet fully supported for
>>unclassified scaled data.  The NODATA value is excluded from auto-scaling
>>min/max computation, but will not be transparent.
>
> So I must found another solution for my rasters.
>
> Regards.
>
>
>
> 2015-08-18 9:08 GMT+02:00 Andrea Peri <aperi2007 at gmail.com>:
>> So my question is a little different.
>>
>> Seem that mapserver was not able to automatically understand the
>> NODATA values of floating point rasters.
>>
>> In my usecase: the NODATA value is -9999.0
>> I produce the catalog using gdaltindex, and apply the result to mapserver 7.
>>
>> The result is this:
>>
>> http://tinyurl.com/ndsdyr8
>>
>> The only partially solution I found was to set
>> OFFSITE 0 0 0
>> but it is acceptable for my usecase because the black color is a color
>> really available inside the rasters and it is not usable as a
>> transparent color.
>>
>> Is this an issue for mapserver 7 ?
>>
>> Thx,
>>
>> A.
>>
>>
>>
>> 2015-08-17 16:11 GMT+02:00 Andrea Peri <aperi2007 at gmail.com>:
>>> Hi Jukka.
>>>
>>> Perhaps you have right !
>>>
>>> The NODATA setting is an ancient setting that I reuse always in my
>>> mapfiles but only now I notice that the mapserver document don't
>>> report him.
>>> So more probably it is a false setting.
>>>
>>> But , if the nodata setting dont exist, how say to the mapserver to
>>> filter the nodata of a floating raster  ?
>>>
>>> Thx.
>>>
>>
>>>> --
>>>> -----------------
>>>> Andrea Peri
>>>> . . . . . . . . .
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>>>
>>>
>>>
>>> --
>>> -----------------
>>> Andrea Peri
>>> . . . . . . . . .
>>> qwerty àèìòù
>>> -----------------
>>
>>
>>
>> --
>> -----------------
>> Andrea Peri
>> . . . . . . . . .
>> qwerty àèìòù
>> -----------------
>
>
>
> --
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
> -----------------



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Andrea Peri
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qwerty àèìòù
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