[mapserver-users] geotiff 48bit with mapserver 7 wms

Fri Apr 14 15:56:09 PDT 2017

I did not reply after my latest test, sorry.
I tried all tiff IMAGEMODE for my data set. None gave me 16 bit at the gis 
client.
As far as I understand gtiff is 8 bit.
The only IMAGEMODE for integer is signed INT16 , which is unfortunately the 
only supported integer data type. For RGB data unsigned integer is the only 
integer data type that makes sense. Just if i change the IMAGEMODE to 
FLOAT32 mapserver will serve more than 8 bit per band.
I think i will give gdal and float32 bit a try nevertheless it will double 
the image size.
Maybe someone else has an idea.

On April 14, 2017 1:43:09 PM Stephen Woodbridge <woodbri at swoodbridge.com> 
wrote:

> http://mapserver.org/mapfile/outputformat.html
>
> Why not serve them a GTiff format for qgis?
>
> You can define multiple output formats in the mapfile, and let the
> browser use the 8bit png and have qgis request images in gtiff format.
>
> -Steve
>
> On 4/13/2017 11:03 AM, David wrote:
>> Hi Steve,
>>
>> thank you very much for your help. The Mapserver is serving the tiles
>> with the correct RGB values now. The problem is, that it is serving 8
>> bit per band and not 16 bit.
>> I need the 16bit because i want to use the wms as a base layer for some
>> further processing with qgis or another gis client. So no problem
>> regarding browsers for me.
>>
>> I will take a look and change the data type to float32 for the tiff
>> files. At least this is an supported OUTPUTFORMAT for mapserver.
>> Any suggestions on this matter are highly appreciated.
>>
>> Cheers,
>> David
>>
>> ------ Original Message ------
>> From: mapserver-users-request at lists.osgeo.org
>> To: mapserver-users at lists.osgeo.org
>> Sent: 4/12/2017 4:00:02 PM
>> Subject: mapserver-users Digest, Vol 111, Issue 5
>>
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>>>    1. geotiff 48bit with mapserver 7 wms (David)
>>>    2. Re: geotiff 48bit with mapserver 7 wms (Stephen Woodbridge)
>>>
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>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Wed, 12 Apr 2017 00:22:12 +0000
>>> From: David <david at impstyle.com>
>>> To: mapserver-users at lists.osgeo.org
>>> Subject: [mapserver-users] geotiff 48bit with mapserver 7 wms
>>> Message-ID: <em5ce0e1b3-00b1-463e-8ad8-90100518d131 at laptop-dfriedrich>
>>> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>>>
>>> Hi there,
>>>
>>> iam having some trouble to serve 48 bit geotiff images with a mapserver
>>> 7 wms. I created to layers for speed purposes with scale limiters. The
>>> lowres layer is served well and looks good, it is 24bit geotiff
>>> data(8bit per channel). But if the layer changes to the highres, 48bit
>>> geotiff data(16bit per channel), the data is shown wrong.
>>> I searched for some hints regarding a similar issue but could not find
>>> something.
>>>
>>> This is a screenshot of the loaded highres layer. It does not matter if
>>> i load a bbox inside the browser, qgis or another wms client. The
>>> highres data looks always the same.
>>>
>>> image loaded from highres layer:
>>> http://imgur.com/a/B65cp
>>>
>>> the mapfile:
>>> https://pastebin.com/4G2DZErZ
>>>
>>> the gdalinfo for one 16bit 3-band tile:
>>> https://pastebin.com/kfS0BjmE
>>>
>>> Best Regards,
>>> David
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>>> ------------------------------
>>>
>>> Message: 2
>>> Date: Tue, 11 Apr 2017 21:25:01 -0400
>>> From: Stephen Woodbridge <woodbri at swoodbridge.com>
>>> To: mapserver-users at lists.osgeo.org
>>> Subject: Re: [mapserver-users] geotiff 48bit with mapserver 7 wms
>>> Message-ID: <a7bc734d-f7b9-32f3-5ce0-6a71aab4ead4 at swoodbridge.com>
>>> Content-Type: text/plain; charset=utf-8; format=flowed
>>>
>>> Read this:
>>> http://mapserver.org/input/raster.html
>>>
>>> You need to add to your highres layer
>>>
>>> PROCESSING "SCALE=AUTO"
>>>
>>> Or per band scaling. I done thing most browsers know what to do with 16
>>> bits per channel.
>>>
>>> -Steve W
>>>
>>> On 4/11/2017 8:22 PM, David wrote:
>>>>  Hi there,
>>>>
>>>>  iam having some trouble to serve 48 bit geotiff images with a mapserver
>>>>  7 wms. I created to layers for speed purposes with scale limiters. The
>>>>  lowres layer is served well and looks good, it is 24bit geotiff
>>>>  data(8bit per channel). But if the layer changes to the highres, 48bit
>>>>  geotiff data(16bit per channel), the data is shown wrong.
>>>>  I searched for some hints regarding a similar issue but could not find
>>>>  something.
>>>>
>>>>  This is a screenshot of the loaded highres layer. It does not matter if
>>>>  i load a bbox inside the browser, qgis or another wms client. The
>>>>  highres data looks always the same.
>>>>
>>>>  image loaded from highres layer:
>>>>  http://imgur.com/a/B65cp
>>>>
>>>>  the mapfile:
>>>>  https://pastebin.com/4G2DZErZ
>>>>
>>>>  the gdalinfo for one 16bit 3-band tile:
>>>>  https://pastebin.com/kfS0BjmE
>>>>
>>>>  Best Regards,
>>>>  David
>>>>
>>>>
>>>>  _______________________________________________
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>>>>  mapserver-users at lists.osgeo.org
>>>>  https://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>>
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