Ok, thanks for taking you time answering these questions. I am testing this out now as I am writing this e-mail :-)
Espen 2009/8/14 Rahkonen Jukka <[email protected]>: > Hi, > > I have not played with either lately. At least one difference is that > gdal_merge.py can't warp images. Gdalwarp has also lots of more options. > Long time ago I used modified gdal_merge.py first for creating a virtual > raster file (.VRT) which I used later as input file for gdalwarp. Now there > seems to be a separate tool for this purpose, gdalbuildvrt. Is even seems to > acceps Mapserver tileindex files as input. I guess that if you'll select to > make rectangular images with no nodata areas then the work chain would > include (gdaltindex) - gdalbuildvrt - gdalwarp. > > -Jukka Rahkonen- > > Espen Isaksen wrote > > >> Yes, that is a solution that will probably work. Do you know >> the difference between gdal_merge.py and gdalwarp? >> >> Espen >> >> >> >> 2009/8/14 Rahkonen Jukka <[email protected]>: >> > Hi, >> > >> > Not a very clever solution is to get rid of the collards >> forever. However, it works for sure. Select a rectangular >> grid in preferred output projection and mosaic and compress >> the original images to suit that grid with gdalwarp by using >> -te option. Then there will be no black borders to make >> transparent any longer. It does not mean much extra work if >> you have to compress the images in any case, but it does make >> updating image layer a bit more complicated if you will >> receice new images from scattered places every now and then. >> > >> > -Jukka Rahkonen- >> > >> > >> >> -----Alkuperäinen viesti----- >> >> Lähettäjä: [email protected] >> >> [mailto:[email protected]] Puolesta Espen >> >> Isaksen >> >> Lähetetty: 14. elokuuta 2009 12:00 >> >> Vastaanottaja: [email protected] >> >> Aihe: [mapserver-users] Removing collars on raster images >> >> >> >> Hi! >> >> >> >> This question has been asked in different ways before, but the >> >> threads do not seem to give me the answers I need. >> >> >> >> We have lots of TB of images with black collars(borders). We would >> >> like to try out using Mapserver for serving these images, >> but we need >> >> to have the black collars transparent. >> >> That is fine in Mapserver as long at you use regular Tiff. >> >> However, because of the many TB of data we need to >> compress this data >> >> and preferably tiff with jpeg compression. >> >> >> >> However, this compression creates edges between the collar and the >> >> image where the image does not get transparent. >> >> >> >> I am struggling to find a solution to this problem. Is >> ideas on how >> >> we can avoid this problem? Is it for example possible to set a >> >> transparency mask in the Tiff image which can be used by Mapserver? >> >> Another solution would be if Mapserver could support >> setting an area >> >> in an image transparent based on a polygon file. >> >> >> >> Any help is appreciated. >> >> >> >> Espen >> >> _______________________________________________ >> >> mapserver-users mailing list >> >> [email protected] >> >> http://lists.osgeo.org/mailman/listinfo/mapserver-users >> >> >> > >> > _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
