[Xastir] what format to export MrSID for xastir use?

[Wes Johnston]

I thought lizardtech was going to release a driver for their compression format?

Wes
--



Quoting "Curt, WE7U" <archer at eskimo.com>:

> On Fri, 28 Jan 2005, Tom Russo wrote:
>
> >   Image Width: 6452 Image Length: 7618
> >   Bits/Sample: 8
> >   Compression Scheme: None
> >   Photometric Interpretation: min-is-black
> >   Samples/Pixel: 1
> >   Rows/Strip: 1
> >   Planar Configuration: single image plane
> >
> >  > gdalinfo 34106H31.tif
> > PROJCS["NAD83 / UTM zone 13N",
> >     GEOGCS["NAD83",
> >         DATUM["North_American_Datum_1983",
> >             SPHEROID["GRS 1980",6378137,298.2572221010002,
>
> Hey, that looks like they exactly duplicated the USGS DRG
> parameters.  Just with quick look at it that's what I see anyway.
> Same projection and everything.
>
>
> > They work fine, and seem to benefit from the DRG speedups.  I do see,
> > though, that the file size balloons from 2.7Mb in MrSID format to
> > almost 50MB in GeoTIFF --- even if I enable packbits compression.
> > Pity, that.
>
> As much as I despise proprietary compression schemes such as MrSID
> (they make publicly-available and free data less publicly available
> due to locking the data into proprietary formats), I think there's a
> way to use MrSID from inside GDAL, or we could try to use their
> development kit directly without GDAL.  The raster portion of our
> GDAL integration isn't finished yet, so it might take a while to get
> there.
>
> I'd rather get the state/gov't sites to provide non-MrSID, more open
> format data, but they're all led to the dark side by the extreme
> compression of MrSID.  It'd be a losing battle to just say no to
> MrSID.
>
> --
> Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
> "Lotto:    A tax on people who are bad at math." -- unknown
> "Windows:  Microsoft's tax on computer illiterates." -- WE7U
> "The world DOES revolve around me:  I picked the coordinate system!"
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