[OZAPRS] 1:250K Mosaic

[Rendrag]

Reminds me of the 120Gb GeoTIFF we have of four 10m (landsat iirc?)
mosaic's
overlaid to give roughly 2.5m resolution (Took us five weeks to generate
the
bastard.. Writing the software to do the overlay was fun though :)..  Ends
up at around 25Gb as a JPG - still trying to find something outside of
TNT/MIPS that'll view it :)

Cheers,

DG

----- Original Message ----- 
From: "ANDREW MCDADE" <amcdade at iprimus.com.au>
To: <ozaprs at marconi.ics.mq.edu.au>
Sent: Wednesday, April 13, 2005 7:41 AM
Subject: Re: [OZAPRS] 1:250K Mosaic


> Yes a 702Mb ecw file ends up at 1.4Gigs. Its getting a bit large for a
> single file !!.  In fact Uiview is a bit limiting on the maximum file
size
> it can use. At least it used to be in older versions. I used to try to
load
> in 1:50K topo maps at around 20Mb , which didnt work. I had to use
colour
> depth deduction and resolution reduction in order for these sized files
to
> load. I havnt tried this in later versions on uiview however. It would
be
> great if xastir could be made to handle the ecw format directly. Im sure
it
> would be in the realms of possibility.
>
> 73 .. Andrew .. VK5EX
>
>
> ----- Original Message -----
> From: "Richard Hoskin" <vk3jfk at amsat.org>
> To: <ozaprs at marconi.ics.mq.edu.au>
> Sent: Tuesday, April 12, 2005 9:04 PM
> Subject: RE: [OZAPRS] 1:250K Mosaic
>
>
> >
> > You can convert ECW to PNG or JPG etc but the file size can be over
double
> > the original ECW file . It can take several days to do on a fast PC.
> >
> > It's best to do it in small blocks and then stick the blocks together.
> >
> > My understanding is UI-View reads the full map into memory and
displays
it
> > where as OZiexplorer just reads the bit it requires into memory. Hence
> > UI-View map size limited to your physical hardware & OS capabilities
etc.
> >
> > Cheers
> > Richard
> > VK3JFK
> >
> >
> > > -----Original Message-----
> > > From: ozaprs-bounces at marconi.ics.mq.edu.au [mailto:ozaprs-
> > > bounces at marconi.ics.mq.edu.au] On Behalf Of ANDREW MCDADE
> > > Sent: Tuesday, 12 April 2005 2:51 PM
> > > To: vk4tec at tech-software.net; ozaprs at marconi.ics.mq.edu.au
> > > Subject: Re: [OZAPRS] 1:250K Mosaic
> > >
> > > Thr 1:250K mosaic is in fact a single 702 Mb file. It is also in ECW
> > > format,
> > > which is fairly specific to mapping type apps. ie. Oziexplorer etc.
> There
> > > is
> > > absolutely no way Uiview will handle either this file size or this
file
> > > type. Im not fully up with Xastir, but I would assume that unless it
can
> > > handle the ECW file format ,  it would be a struggle to work. Of
course
> > > there is nothing to say that the ecw format could be supported at
some
> > > point
> > > by xastir and other apps.
> > >
> > > 73 .. Andrew ..  VK5EX
> > >
> > >
> > > ----- Original Message -----
> > > From: "Andrew Rich" <vk4tec at tech-software.net>
> > > To: "ANDREW MCDADE" <amcdade at iprimus.com.au>;
> <vk4tec at tech-software.net>;
> > > <ozaprs at marconi.ics.mq.edu.au>
> > > Sent: Tuesday, April 12, 2005 9:27 AM
> > > Subject: Re: [OZAPRS] 1:250K Mosaic
> > >
> > >
> > > > So Andrew you are saying that UI-VIEW does not handle the mosaic
> > > > image ?
> > > >
> > > > I am keen to try xastir
> > > >
> > > > > Gday Andrew and others,
> > > > >
> > > > > Yes I use the 1:250K mosaic a lot of the time. Along with
Darryls
> > > > programs
> > > > > oziaprs and aprsnet.as well as Uiview and Oziexplorer. It all
works
> > > > rather
> > > > > well. Unfortunatley there doesnt appear to be an aprs program
that
> > > > can
> > > > > handle the large size ie 600 Meg plus of the 1:250K mosaic in
its
> > > > own right.
> > > > > 73 ... Andrew .. VK5EX
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Andrew Rich" <vk4tec at tech-software.net>
> > > > > To: "Ozaprs at Marconi.Ics.Mq.Edu.Au"
<ozaprs at marconi.ics.mq.edu.au>
> > > > > Sent: Monday, April 11, 2005 7:06 PM
> > > > > Subject: [OZAPRS] 1:250K Mosaic
> > > > >
> > > > >
> > > > > > Gudday,
> > > > > >
> > > > > > Wonder if anyone is using the recently released NATMAP 250K
Mosaic
> > > > topo
> > > > > maps
> > > > > > of OZ for APRS ?
> > > > > >
> > > > > > There is two types of product, 4xCD and 2xDVD
> > > > > >
> > > > > > I am particularly interested in the MOSAIC or "continous" map
> > > > > >
> > > > > > http://www.ga.gov.au/nmd/products/maps/raster250k/
> > > > > >
> > > > > > Cheers Andy VK4TEC
> > > > > >
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> > > > > >
> > > > > >
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