Re: [udig-devel] GDAL and JAI

[Adrian Custer <acuster@xxxxxxxxx>]

On Thu, 2008-11-13 at 08:34 -0800, Graham Davis wrote:
> Yes, I think step 1 will be setting 2 anchor points on the image (not 
> necessarily top-right and bottom-left, just any 2 points that the user 
> can easily distinguish) and marking where those same 2 points should be 
> on the main background map.  Then I could probably do some JAI affine 
> warp to automatically make the image fit on the map without the user 
> needing to fiddle with it (at least I think I can).  I may also have a 
> mode where the user can do it all manually (rotate, stretch, warp) if 
> they don't like the auto results.

Hey Graham,

you might look at 
  org.geotools.referencing.operation.transfrom.WrapTransform2D 
which will do most of the calculations for you and pass off the work to
JAI.

--adrian


> 
> Good idea on using the glass pane, that might be better than having each 
> image on it's own layer.
> 
> Graham.
> 
> 
> Paul Ramsey wrote:
> > Two points, and you're either in "bottom left" or "top right" mode.
> > That gives you position, scale and rotation. You're probably not even
> > going to *need* sheer, which means you're not even using all the terms
> > of an affine.
> >
> > The hardest part of getting a rational UI will probably step #1,
> > before you have any information at all about where to put things.
> > Perhaps step one, is, "tell me where the bottom-left and top-right
> > are". At that point you can paint the image on and proceed to the fine
> > manipulation. Worst case, you can paint it into Emily's glass pane,
> > right? You don't even need to give it an official "Layer".
> >
> > P.
> >
> > On Wed, Nov 12, 2008 at 8:26 AM, Graham Davis <gdavis@xxxxxxxxxxxxxxx> wrote:
> >   
> >> Thanks Jan and others,
> >> .
> >> I will take a look at what you've done and see if I can leverage it for this
> >> project.  I'll be sure to send you any questions that I may have as I go
> >> through it.  As for my UI, I'm really looking to do something simple.
> >>  Something similar to what Adrian described, with picking "anchor" points
> >> and visually dragging/stretching the image.  But I'll need to play around
> >> with it a bit before I know what exactly will or won't work.
> >>
> >> Graham.
> >>
> >>
> >>
> >> Jan Jezek wrote:
> >>     
> >>> Hi Graham,
> >>>
> >>> I've done something that might be useful during Google Summer of Code
> >>> 2006/07. It's little bit out of date so I'm just trying to put the udig
> >>> plugin (that includes raster support) into the shape in the repo.
> >>>
> >>> In the short I've made few 'MathTransformBuilder' objects, that calculates
> >>> you proper transformation from set of ground control point (using LSM).
> >>> You can calculate linear method like Similar, Affine, Projective or
> >>> warping methods like 'rubber sheeting' or GridBased methods and then you are
> >>> able to apply it on the vector or raster. For rasters I tried to use
> >>> extended JAI WarpTransform2D to apply warping methods but this work has not
> >>> been committed to GeoTools trunk yet.
> >>>
> >>> Some (little bit out of date) documentation is here:
> >>>
> >>> http://geotools.codehaus.org/New+Transformation+Algorithms+for+GeoTools+and+uDig
> >>>
> >>> Some methods are already committed under
> >>> GeoTools/Referencig/operation/builder sub package (mostly the linear ones  -
> >>> should work for rasters as well as vectors).
> >>>
> >>> Some code (still waiting for trunk) is here (it includes the raster
> >>> support for warping algorithms):
> >>> http://gtsvn.refractions.net/trunk/spike/jan/gsoc-transformations/
> >>>
> >>> I'll try to ensure that everything is up to date during todays evening and
> >>> then I send you the link for simple plugin that should work for trunk. Best
> >>> regards,
> >>>
> >>> Jan.
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> ______________________________________________________________
> >>>
> >>>       
> >>>> Od: gdavis@xxxxxxxxxxxxxxx
> >>>> Komu: User-friendly Desktop Internet GIS
> >>>> &lt;udig-devel@xxxxxxxxxxxxxxxxxxxxx&gt;
> >>>> Datum: 10.11.2008 22:58
> >>>> Předmět: [udig-devel] GDAL and JAI
> >>>>
> >>>> Hi,
> >>>>
> >>>> I'm looking into making a small module in uDig for image manipulation.
> >>>>  Basically my client wants to take an aerial photo and place it overtop of a
> >>>> satellite base layer.  They want to be able to manually manipulate this
> >>>> photo and visually fit it onto the correct spot of the map.  The
> >>>> manipulation they want to be able to achieve includes shrinking/growing the
> >>>> image, rotating it and morphing it to align correctly.  Ideally this would
> >>>> be done in real-time with the user manipulating  the image with their mouse
> >>>> and maybe some numerical input.  Once the user is satisfied with their
> >>>> approximate placement, they can "lock it in" at which point I will save the
> >>>> resulting image and its coordinates as a geotiff.
> >>>>
> >>>> I am currently looking at JAI and GDAL to see if these sorts of image
> >>>> manipulation functions are available.  I haven't used either library very
> >>>> extensively, so it is pretty new to me.  The GDAL documentation seems to be
> >>>> pretty light in general (at least for Java and GeoTools).  I've only found
> >>>> these resources:
> >>>>
> >>>> - http://docs.codehaus.org/display/GEOTOOLS/ImageIO-EXT+GDAL
> >>>> - http://trac.osgeo.org/gdal/wiki/GdalOgrInJava
> >>>>
> >>>> Does anyone know of other helpful resources that I could use for this
> >>>> project?  Are there any uDig modules that currently do anything like this,
> >>>> with example code I could look at?  Or perhaps someone has some suggestions
> >>>> for how I might approach this so that it fits nicely with current uDig
> >>>> designs?  If this functionality sounds useful to others, I'm all for trying
> >>>> to make this module "official".  Thanks,
> >>>>
> >>>> -- Graham Davis
> >>>> Refractions Research Inc.
> >>>> gdavis@xxxxxxxxxxxxxxx
> >>>>
> >>>> _______________________________________________
> >>>> User-friendly Desktop Internet GIS (uDig)
> >>>> http://udig.refractions.net
> >>>> http://lists.refractions.net/mailman/listinfo/udig-devel
> >>>>
> >>>>
> >>>>         
> >>>       
> >> --
> >> Graham Davis
> >> Refractions Research Inc.
> >> gdavis@xxxxxxxxxxxxxxx
> >>
> >> _______________________________________________
> >> User-friendly Desktop Internet GIS (uDig)
> >> http://udig.refractions.net
> >> http://lists.refractions.net/mailman/listinfo/udig-devel
> >>
> >>     
> 
>