[mapserver-users] [gdal-dev] Gdaltindex with -t_srs and Mapserver

Thu Sep 27 08:00:26 PDT 2012

This is a new feature I can champion. I will try to allocate some
development dollars behind this as this is something we at USACE would
find useful.

Mike

-- 
Michael Smith

US Army Corps
Remote Sensing GIS/Center

On 9/27/12 10:06 AM, "Daniel Morissette" <dmorissette at mapgears.com> wrote:

>I think mixed projection raster tileindex is a cool idea, but it should
>probably be kept separate from RFC 37 (even if both need to happen at
>the same time).
>
>Now, as for any new feature request, you just need to find a champion
>with time/interest/funding to make it happen.  :)
>
>Daniel
>
>
>On 12-09-27 9:36 AM, Rahkonen Jukka wrote:
>> Hi,
>>
>> This is an intentional cross-posting and the main message is to support
>>implementing RFC 37
>> http://mapserver.org/development/rfc/ms-rfc-37.html
>> and enlarge it to support mixed-projection raster tileindex layers, if
>>possible.
>>
>> -Jukka Rahkonen-
>>
>> Vastaanottaja: 'gdal-dev at lists.osgeo.org'
>> Aihe: Re: [gdal-dev] Gdaltindex with -t_srs and Mapserver
>>
>> Hi,
>>
>> I did not meant to underestimate this little but extremely useful
>>improvement. However, you made me hungry: if you can see so simply the
>>image footprints, why not also the images?  I am already publishing in
>>our WMS also the tileindex  shapefiles so people can see the image
>>boundaries and make GetFeatureInfo queries from the image metadata that
>>we have added to the shapefile as a few extra fields. In order to make
>>it works we have reprojected images from their original projection zones
>>into one common zone.  Now I wonder if it could be possible to make
>>Mapserver to support tileindex layers containing source images with
>>mixed projections. As a non-programmer I have a strong belief that if I
>>can say what I want, someone can program it.
>>
>> I believe that Mapserver already gets the correct image list from the
>>mixed-projection shapefile.   I guess also that Mapserver does not read
>>image metadata from the geotiff image files for getting the projection
>>but it relies on the LAYER level PROJECTION setting. In my simple test
>>case with two images, one in EPSG:2393 and another in EPSG:2392 this
>>means that Mapserver thinks that images are 1000 kilometers apart and
>>sharing the EPSG:2393 system that I used in the PROJECTION block.
>>
>> Perhaps there could be an optional setting for LAYER level PROJECTION,
>>both for individual images and tileindex layers, something like
>>"init:internal_metadata".  It would mean that Mapserver would do first a
>>query in a same manner than gdalinfo and ogrinfo for reading the native
>>projection of the dataset.
>>
>> Ok, once written this long I started to think about using PROJECTION
>>AUTO and then I found this three-year-old RFC
>>http://mapserver.org/development/rfc/ms-rfc-37.html
>>
>> +1 for implementing it.
>>
>> By the way, woudn't it be nice if desktop GIS like QGIS would show you
>>also your Landsat archive images and not only the footprints in some
>>pretty automatic way, let's say, after ticking a check box and setting
>>the maximum scale denominator value?
>>
>> -Jukka Rahkonen-
>>
>>
>>
>>
>>
>>> -----Alkuperäinen viesti-----
>>> Lähettäjä: Etienne Tourigny [mailto:etourigny.dev at gmail.com]
>>> Lähetetty: 27. syyskuuta 2012 15:27
>>> Vastaanottaja: Rahkonen Jukka
>>> Kopio: gdal-dev at lists.osgeo.org
>>> Aihe: Re: [gdal-dev] Gdaltindex with -t_srs and Mapserver
>>>
>>> Jukka,
>>>
>>> nice that you noticed this new feature I added - was about to
>>> advertise it here!
>>>
>>> The goal of adding this feature was not to make it available in
>>> mapserver, but for using in desktop applications as a reference for
>>> multiple files with different projections (e.g. landsat archives).
>>>
>>> cheers
>>> Etienne
>>>
>>> On Thu, Sep 27, 2012 at 6:07 AM, Jukka Rahkonen
>>> <jukka.rahkonen at mmmtike.fi> wrote:
>>>> Hi,
>>>>
>>>> I had a try with gdaltindex and the new -t_srs option that is
>>>> discussed in http://trac.osgeo.org/gdal/ticket/4773. It seems to be
>>>> as Even was thinking in the very beginning and Mapserver does not
>>>> work with tileindex which is containing reprojected bounding boxes.
>>>> Images with BBOX in the native projection are shown but not the
>>>> others. This line
>>> appears into Mapserver log:
>>>> msDrawRasterLayerGDAL(): Error in overlap calculation.
>>>>
>>>> It might indeed be good to emit a warning about Mapserver
>>>> incompability. It would be very nice if Mapserver supports this kind
>>>> of
>>> tileindeces.
>>>>
>>>> -Jukka Rahkonen-
>>>>
>>>> _______________________________________________
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>>>> gdal-dev at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
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>
>
>-- 
>Daniel Morissette
>http://www.mapgears.com/
>Provider of Professional MapServer Support since 2000
>
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