Forwarding this email to qgis-dev list - Regarding tileindex usage with preview image inside qgis.
On Thu, Sep 27, 2012 at 10:30 AM, Rahkonen Jukka <jukka.rahko...@mmmtike.fi> wrote: > 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? It would be great to see such a thing in QGIS - any way that mapserver code could be useful to QGIS? Or better yet - have a control in the tileindex layer to open the associated raster layer? > > -Jukka Rahkonen- > > > > > >> -----Alkuperäinen viesti----- >> Lähettäjä: Etienne Tourigny [mailto:etourigny....@gmail.com] >> Lähetetty: 27. syyskuuta 2012 15:27 >> Vastaanottaja: Rahkonen Jukka >> Kopio: gdal-dev@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- >> > >> > _______________________________________________ >> > gdal-dev mailing list >> > gdal-dev@lists.osgeo.org >> > http://lists.osgeo.org/mailman/listinfo/gdal-dev > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
