[mapserver-users] Mapserver 7.0 and NODATA setting

[Andrea Peri]

Hi,
I see it, I can set a nodata value, but mapserver seem to ignore it.
I was able to remove it from maps only setting the its color (white)
to transparent.

Now I try the same dataset-vrt using qgis directly to have another
point of view.


2015-09-07 13:18 GMT+02:00 Yves Jacolin <yves.jacolin at camptocamp.com>:
> Andrea,
>
> Maybe you can have a look into VRT format where you can set up a NODATA value.
>
> Regards,
>
> Y.
> On Sunday, September 06, 2015 12:32:12 Andrea Peri wrote:
>> Hi,
>>
>> I have no success to find any info on the NODATA question in the
>> floating point raster.
>>
>> Is this kind of raster suitable for use on mapserver ?
>>
>> Thx.
>>
>> 2015-08-18 10:27 GMT+02:00 Andrea Peri <aperi2007 at gmail.com>:
>> > 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
>> >>>>> . . . . . . . . .
>> >>>>> qwerty àèìòù
>> >>>>> -----------------
>> >>>>> _______________________________________________
>> >>>>> mapserver-users mailing list
>> >>>>> mapserver-users at lists.osgeo.org
>> >>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>> >>>>
>> >>>> --
>> >>>> -----------------
>> >>>> Andrea Peri
>> >>>> . . . . . . . . .
>> >>>> qwerty àèìòù
>> >>>> -----------------
>> >>>
>> >>> --
>> >>> -----------------
>> >>> Andrea Peri
>> >>> . . . . . . . . .
>> >>> qwerty àèìòù
>> >>> -----------------
>> >>
>> >> --
>> >> -----------------
>> >> Andrea Peri
>> >> . . . . . . . . .
>> >> qwerty àèìòù
>> >> -----------------
>> >
>> > --
>> > -----------------
>> > Andrea Peri
>> > . . . . . . . . .
>> > qwerty àèìòù
>> > -----------------
>
> --
> Responsable Formation et Support
> Camptocamp France SAS
> Savoie Technolac, BP 352
> 73377 Le Bourget du Lac, Cedex
> Tel (France) : +33 4 58 48 20 43 (new !)
> Tel (Suisse) : +41 21 619 10 43
> Mob. : +33 6 18 75 42 21
> Fax : 04 79 70 15 81
> Mail : yves.jacolin at camptocamp.com
> http://www.camptocamp.com



-- 
-----------------
Andrea Peri
. . . . . . . . .
qwerty àèìòù
-----------------