2014-03-04 10:04 GMT+01:00 Hans Gregers Petersen <[email protected]>:
> Indeed it does not require a decompression of the whole file - in my
> experience though the partial decompression is still slower
> (especially on big ECWs) than reading an overview using GDAL. It might
> be something to do with the way the OS accesses the ECW file.
>
I didn't run any specific benchmark on them but my personal experience is
on the contrary a very fast behavior. Indeed I have been using them with
proprietary software, may be the difference is in the ECW sw release used
to access them?
I didn't fully understand how a VRT could help in reducing access time,
letting apart the big problem of format unsupported highlighted by Andrea,
maybe I am wrong but I thought that when using VRT you always have to
search for inner overviews browsing the ECW file. Or maybe you meant
creating external overview in geotiff format?
Thanks for sharing your thoughts on this.
Cheers,
Stefano
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