[GRASSLIST:3609] Re: function to compare rasters visually

[Daniel Victoria]

Yeas, ERDAS has this function and is called Swipe... 

It would be nice to have this in Grass.

As for posting the script as wish, I never did such
thing, don't know if John did though.

Daniel


--- Martin Wegmann <mailinglist2_wegmann at web.de>
wrote:
> Thanks Daniel,
> 
> I will try the script, pretty useful. I already know
> it from ERDAS and think 
> that this function should be available per default
> in GRASS. But I was rather 
> looking for a comparison of two rasters inside the
> same monitor. I think 
> there does an equivalent function in ERDAS exist
> which name I forgot. 
> 
> Just to make it clear, raster 1 =  a; raster 2 = b
> 
> either with a moving border which is moved with the
> mouse across the monitor 
> 
> a a a a b b	a a a b b b
> a a a a b b ->a a a b b b
> a a a a b b     a a a b b b
> 
> horizontally or vertically. 
> Which would be fantastic: A dynamic border which can
> be changed by moving the 
> mouse in different directions (from vertical to
> horizontal to diagonal and 
> anything in between) 
> 
> or two raster which dissolve and the strength of
> dissolving can be changed. 
> 
> - just raster 1 visible
> - raster 1 80 % visible, raster 2 20% visible
> - until raster 2 100% visible 
> 
> 
> cheers Martin 
> 
> 
> BTW did you or John already post this script as wish
> to be implemented in 
> GRASS? 
> 
> 
> On Monday 07 June 2004 14:19, Daniel Victoria wrote:
> > Hi Martin,
> >
> > I had a similar problem once and John was kind
> enough
> > to send me this script. It links to grass displays
> > monitors so, whaever you look at in X0, X1 will
> > follow, like linking the displays geographically
> in
> > ERDAS.
> > Hope it helps, but don't thanks me, thanks John
> >
> > Cheers
> > Daniel
> >
> > --------------------------------------------------
> > From:	"John Gillette" <JGillette at rfmd.com>
> > To:	"Daniel Victoria" <daniel_victoria at yahoo.com>,
> > "Sandro Klippel"
> <sandro.klippel at talha-mar.com.br>,
> > "GRASSLIST" <grasslist at baylor.edu>
> >
> >
> > try this:
> >
> > Select and then Erase x1 and then display what
> ever
> > you want there.
> > Select x0 and erase and display other info there.
> >
> > Run this script to either pan or zoom in x0. 
> After
> > finishing
> > the pan or zoom x1 will redraw it's contents at
> the
> > same region
> > thereby "following" what ever is done in x0.
> >
> > The disadvantage is that you can only do 1 pan or
> zoom
> > at a time,
> > i.e. not interactively.
> >
> > usage:
> >
> > script_name z   <- does zoom instead of pan
> > script_name
> >
> > zooming and panning in x0.  x0 is selected at
> exit.
> >
> > Does this help?
> >
> > John
> >
> > ------------------
> > #!/bin/sh
> >
> > d.mon select=x1
> > monitor1=`d.save -o`
> >
> > d.mon select=x0
> > if [ "$1" = "z" ]
> >  then
> >    d.zoom
> >  else
> >    d.pan
> > fi
> > region=`g.region -g`
> >
> > d.mon select=x1
> > d.erase
> > g.region $region
> > eval "$monitor1"
> >
> > d.mon select=x0
> >
> > exit 0
> >
> > --- Martin Wegmann <mailinglist2_wegmann at web.de>
> >
> > wrote:
> > > Hello,
> > >
> > > I was looking for a function which makes it easy
> to
> > > compare two images
> > > visually by dissolving the upper image or only
> > > displaying parts of the upper
> > > image and moving the border between upper and
> lower
> > > image across the monitor.
> > > In other programs it is called dissolve or
> flicker.
> > > But I couldn't find
> > > anything related to this by using the GRASS
> search
> > > function.
> > >
> > > Thanks for pointing me to the correct word in
> GRASS.
> > > Martin
> >
> > __________________________________________________
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