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I ran an experiment with a TIFF file and an ECW. Started with a 1.2 GB ECW, and converted it to TIFF with compression and pyramids, it was ~1.5 GB. So I think that a TIFF can be a similar size to an ECW. I would mosaic the image using GDAL, ensuring that compression is on. Then build pyramids, and if the resulting file is reasonable (less than 10 GB, I ...

I had a similar problem few weeks ago . I resolved it this way: creating pyramids rasters image (all rasters had got pyramids depends on standard scale rate in my project creating tiles from raster (mosaic) putting all files to postgis (by WKTRaster) By this way you get MRDB (multi-resolution data base) which is the most effective way of serving a large ...

1.- Install Homebrew 2.- Download the ECW/JP2 SDK from ERDAS and install on /usr/local 3.- Install gdal using formula: brew install gdal --enable-unsupported --complete Enjoy. By the way, if in addition you want other things like filegdb, the steps are similar (i.e step 2.5 would be to download and install the filegdb SDK to /usr/local) To ...

You probably have to install the ecw plugin from Erdas. Perhaps you did that for 1.7.4? Erdas will ask for your details but it is no problem. Depends on how you installed qgis, see Quantum GIS and ECW images?

This was said to work (on the mailing list http://osgeo-org.1560.n6.nabble.com/RE-ECW-td4646269i20.html#a5040712): from this archive (http://goo.gl/XiG21) copy gdal_ECW_JP2ECW into C:\OSGeo4W\bin\gdalplugins\1.9 directory. copy all other dll of previous archive in C:\OSGeo4W\bin and C:\Windows\System32 directories

The workaround is to use another GDAL that has ECW compiled and convert to a format that raster2pgsql supports. I suggest looking at the http://www.gisinternals.com/sdk/ Those are built whenever a change in GDAL and have ECW support I believe. Unfortunately the gdal that raster2pgsql is packaged with is incompatible with the VC+ build ones and the gdal just ...

As is evident from your file sizes, the ECW files are compressed while Geotiffs do not seem to be (though, I believe geotiffs support compression). If you are only using the images as a background on maps, I recommend using the ECW because of their size. As you mentioned, since you are using them for change detection there may be artifacts in the ...

I've just heard that ERDAS is about to launch a low cost AGS plugin (verified here). The rep was pretty clear its going to be no where near the $10k previous price so I'm rather intrigued. It will be interesting to see how it performs in v10. Last time i looked into it, ECW was at least 3x faster than the same JP2 in AGS 9.3 so I'm hoping that means I won't ...