Re: [udig-devel] GDAL and JAI

["Jan Jezek" <h.jezek@xxxxxxxxxx>]

Here is the svn with the plugin (for uDig trunk) -
http://svn.refractions.net/udig/udig/community/jan/net.refractions.udig.transformtool/

One of the issue is that the methods based on JAI WarpTransform2D (RubberSheeting, IDW based and  TPS based ) can be used just for small corrections 'inside' the image (AFAIK).

I have quit clear view how the final user interface should work, but have no time to do it. My thought is to make perspective having two map view - one with source image and one with target data, specify the Ground Control Points using both maps and then have a view bellow with table that includes GCPs coordinates, error statistics of each ground control point and also the global statistics (from LSM) including the possibility to enable/ disable some of the GCPs. There should be some components to choose the method as well. Math functionality for such propose is implemented. This approach is usually how it woks in CAD systems.

I'll at least try to do my best to put all I've done into the GeoTools trunk. 

Hope it helps,
Jan.
______________________________________________________________
> Od: h.jezek@xxxxxxxxxx
> Komu: <gdavis@xxxxxxxxxxxxxxx>, <udig-devel@xxxxxxxxxxxxxxxxxxxxx>
> Datum: 11.11.2008 11:13
> Předmět: Re: [udig-devel] GDAL and JAI
>
>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It's little bit out of date so I'm just trying to put the udig plugin (that includes raster support) into the shape in the repo.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Some (little bit out of date) documentation is here: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 <udig-devel@xxxxxxxxxxxxxxxxxxxxx>
>> 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
>>
>
>_______________________________________________
>User-friendly Desktop Internet GIS (uDig)
>http://udig.refractions.net
>http://lists.refractions.net/mailman/listinfo/udig-devel
>