David Booth a �crit: > Hi everyone, > > Hope a mapX question isn't too off-topic for MI-L... > > Does anyone have any tips for speeding up map redraws in mapX (I'm using > V5). > > I'm developing a mapX application which uses a large seamless raster table > as background mapping (20 or so TIFF images - Ordnance Survey Internet > Street Mapping, for anyone in the UK who knows what that is).
We choosed to use a pyramidal format (ECW in our case) for raster. Even if you choose poor compression for a better image quality, this leads to much better performances. the performances are also independant of the file size. So we replaced some hundreds of tiff orthoimages by a unique and quite large (2 Go) ecw file. We made some tests and a rewrite tooks now less than one second instead of 20 to 30 seconds when you zoom out... Ecw reading is included in MapX 5.0 as in MapBasic 7.0 (and you can download a free plugin for older versions of MapInfo). You can very quickly test if this will work for you : Er Mapper has a free compressor that accept imput images up to 500 Mo. - use it to transform directy your tiff images in ecw images in the same directory, keeping also the same name before the extension. - save the .tab files associated to the tiff images (one never knows...) - edit them to replace ".tif" by ".ecw" in the image file names Now you can test your mapX application since the seemless table points to the .tab file, end will then use the ecw compressed images. -- Michel Wurtz MAAPAR/DGA/SDSI/CERIT/DIG --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 8789
