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-...@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....@gmail.com]
Lähetetty: 27. syyskuuta 2012 15:27
Vastaanottaja: Rahkonen Jukka
Kopio: gdal-...@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.rahko...@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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http://www.mapgears.com/
Provider of Professional MapServer Support since 2000
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