Perhaps your environment is not correctly set. Try downloading FWTools, it has a script that sets paths etc. ready.
-Jukka- -----Alkuperäinen viesti----- Lähettäjä: [EMAIL PROTECTED] puolesta: Stefan Schwarzer Lähetetty: pe 18.4.2008 16:02 Vastaanottaja: mapserver-users@lists.osgeo.org Kopio: Paul Spencer Aihe: Re: [mapserver-users] How to tile a large TIF image? Thanks a lot for these details. That should be added to the existing documents! But unfortunately I still get a "Segmentation fault" message... Stef > Stefan, > > I don't think you can specify 10'', you need something in pixels. > But the command is also probably not what you really need to do. > > More likely, you should be doing the following: > > gdal_translate -co "TILED=YES" gebco/bathymetry.tif gebco/ > bathmetry_tiled.tif > > This will create a single tif file that has an internal block size > of 256x256 - you can think of this as having broken your tif up into > 256x256 tiles but keeps them all within the same file. This is > equivalent to breaking the tif up into individual files, creating a > shapefile that has rectangles for each individual files' extent, and > using that as a tile index in mapserver. > > Next, you want to do this: > > gdaladdo gebco/bathymetry.tif 2 4 6 8 16 > > this will pre-compute smaller versions of the tif image called > overviews at 1/2, 1/4 1/6 1/8 and 1/16 of the original size of the > tif - this makes it much more efficient for gdal to return exactly > what mapserver is asking for at any given scale. Depending on the > range of scales that you need to display your raster image at, you > can add more overview levels (or take some away). > > With this two commands, you can make your rasters much more > efficient for mapserver and probably avoid the need to split them up > into many files. > > It does make the file somewhat larger. If you are working with very > large files ( > 4GB ) then you may run into some problems with tiff > and may need to investigate another format or a compressed format > like ECW or MrSID (both requiring commercial licenses I believe). > > There are also some built in compression schemes for tiffs in gdal > which you can apply when running gdal_translate (see > http://www.gdal.org/frmt_gtiff.html > for creation options), for instance: > > gdal_translate -co "TILED=YES" -co "COMPRESS=JPEG" -co > "JPEG_QUALITY=80" gebco/bathymetry.tif gebco/bathmetry_tiled.tif > > would compress the tif using JPEG compression (lossy) set to 80% > (low compression, small loss). > > Cheers > > Paul > > > > On 18-Apr-08, at 5:47 AM, Stefan Schwarzer wrote: >> Thanks for the info. >> >> Did it like this: >> >> Library/Frameworks/GDAL.framework/Versions/1.5/Programs/ >> gdal_translate -outsize 10'' 10'' -co TILED=YES gebco/ >> bathymetry.tif gebco/bathymetry_tiled.tif >> >> But get the message: "Segmentation fault" >> >> Anything that I did wrong? Or should do differently? >> >> Thanks for a hint, >> >> Stef >> >>> Hi, >>> >>> Gdal_translate program has options for you: >>> >>> c:\FWTools>gdal_translate >>> Usage: gdal_translate [--help-general] >>> [-ot {Byte/Int16/UInt16/UInt32/Int32/Float32/Float64/ >>> CInt16/CInt32/CFloat32/CFloat64}] [-strict] >>> [-of format] [-b band] [-outsize xsize[%] ysize[%]] >>> [-scale [src_min src_max [dst_min dst_max]]] >>> [-srcwin xoff yoff xsize ysize] [-projwin ulx uly lrx lry] >>> [-a_srs srs_def] [-a_ullr ulx uly lrx lry] [-a_nodata value] >>> [-gcp pixel line easting northing [elevation]]* >>> [-mo "META-TAG=VALUE"]* [-quiet] [-sds] >>> [-co "NAME=VALUE"]* >>> src_dataset dst_dataset >>> >>> By playing with -srcwin or possibly with -outsize and -projwin you >>> should be able to split your image as you wish. Read more from >>> http://gdal.org/gdal_translate.html >>> >>> -Jukka Rahkonen- >>> >>> >>> >>> Lähettäjä: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >>> ] Puolesta Stefan Schwarzer >>> Lähetetty: 18. huhtikuuta 2008 12:05 >>> Vastaanottaja: mapserver-users@lists.osgeo.org >>> Aihe: [mapserver-users] How to tile a large TIF image? >>> >>> Hi there, >>> >>> I would like to use instead of single large tif image smaller >>> tiles. Although I am well aware of mapserver's and gdal's >>> possibilities to create the shapes for it, I first need to "split" >>> the large tif into 20 or 50 or 100 tiles. >>> >>> Can anyone give me a hint with what kind of software this is >>> possible? >>> >>> There is an ArcGIS script, but it doesn't work on my machine ( >>> http://arcscripts.esri.com/details.asp?dbid=13978 >>> ). >>> >>> Thanks for any hints, >>> >>> Stef >>> >>> ____________________________________________________________________ >>> >>> Stefan Schwarzer >>> >>> Lean Back and Relax - Enjoy some Nature Photography >>> http://photoblog.la-famille-schwarzer.de >>> >>> Appetite for Global Data? UNEP GEO Data Portal: >>> http://geodata.grid.unep.ch >>> >>> ____________________________________________________________________ >>> >>> >>> >>> >>> >>> >> >> _______________________________________________ >> mapserver-users mailing list >> mapserver-users@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/mapserver-users > > > __________________________________________ > > Paul Spencer > Chief Technology Officer > DM Solutions Group Inc > http://www.dmsolutions.ca/ _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users