[Xastir] MrSid format DRG maps

[Gerry Creager]

The nice thing about SID format, when it came out, was that it did 80x 
compression ratios.  The downside was that it was proprietary.  They've 
come a long way, but geotiffs with that resolution still are big.

Don't know what the current issues are with us coding up a reader,but I 
recall that, in the past, they were pretty restrictive (read: 
expensive!!!) in their licensing of that technology.

73 gerry

Bennett, Bruce wrote:
> There seems to be a nice selection of up-to-date DRG's availiable in '.sid'
> format for my area of the country. (
> http://www.puc.state.oh.us/gis/topomaps.cfm )
> 
> There's a utility for decoding .sid files to GeoTiff format offered at -
> 
> http://www.lizardtech.com/download/dl_download.php?detail=geo_mrsiddecode&pl
> atform=lin
> 
> and it seems to work nicely. The issue is the 80x expansion (!) that the
> utility yields (my trial files were around 5-6 Mbytes as '.sid' and nearly
> 450 Mbytes as '.tif' images).
> 
> Does anyone just happen to be working on '.sid' support for xastir a the
> moment? It would be nice to save disk space for other needs by keeping them
> in compressed form...
> 
> Bruce Bennett KB8ROP
> BBennett at Spang.COM
> (440) 352-8600 X 3350
> -------------------------------------------------------------
> An expert is a man who has made all the mistakes which can be made in a very
> narrow field. --Niels Bohr
> 
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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