[mapserver-users] Split large tiffs (topos) like TopoZone

[Paul Ramsey]

Math, sweet math. We converted a bunch of images from one grid layout to
a different one. You have to do some math to convert from image
coordinates to geographic and back out again. You write new twf's for
every new file you create, with the proper geographic coordinates. Perl
+ ImageMagick is a nice combination. The math is not hard, just fiddly
(images have origin at top left, geographics have origin at bottom left,
stuff like that).

"Arthur, John" wrote:
> 
> Yes, but what about the world file(.twf)?
> 
> - John
> 
> -----Original Message-----
> From: Stephen Woodbridge [mailto:woodbri at mediaone.net]
> Sent: Thursday, October 18, 2001 4:21 PM
> To: Arthur, John
> Cc: Mapserver-Users at Lists. Gis. Umn. Edu (E-mail)
> Subject: Re: [mapserver-users] Split large tiffs (topos) like TopoZone
> 
> I believe you could do that with ImageMagick and Perl to automate it.
> You should be able to chop up each of your large maps into n x m tiles.
> 
> -Stephen Woodbridge
>  http://web-maps.org
> 
> "Arthur, John" wrote:
> >
> > I would like to use topo quads in my MapServer, but it would take forever
> to
> > export each quad from Delorme's 3D topoquads. So I exported large 150 mb
> > files instead.  Is there a way to split these up into smaller files or
> just
> > to display the large tiff in MapServer faster.  We would like something
> like
> > what TopoZone.com has (Mad props to you guys @ TopoZone.com), but layer
> our
> > own data on top.
> >
> > John Arthur
> > RF Technician
> > Office:   (757) 490-7221
> > Cellular: (757) 692-1515
> > Email: john.arthur at voicestream.com
> > _~-^-~_
> > VoiceStream
> > W I R E L E S S

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     | Paul Ramsey
     | Refractions Research
     | Email: pramsey at refractions.net
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