On 29.09.2013 13:13, Rahkonen Jukka wrote: > Hi, > > Direct edit works fine and it is to some extent very easy for users. If for > example a scanned image does not suit with existing data, just select the > geometry and move and resize it to suit it with existing data. If one knows > that georeferencing geometries are selectable this is actually very easy and > intuitive. And I do not know that other GIS programs support such a simple > but powerful way for georeferencing.
good to hear.. > The bad thing is that only resize and move are supported. People using > scanned images would immediately ask why images can't be rotated and next, > why images cannot be warped as well. i looked into it, also asked on the list about rotation. problem is i can't realy get my head wrapped around A. how to interpret the rotation parameters of a world file B. how to easily use the geometries corners to interpet and use for a rotation. currently simply the geometry's envelope is used which is identical to the geometry for level oriented polygons. wrt. warping, if you mean free from stretching A. can we even do that to geometries in OJ B. i guess most pictures are scanned maps or the like, so they will most likely properly "warped" already, just need to be positioned within the world coordinate system so i'd leave that for now entirely. > Supporting rotated images would mean about the same as supporting the > rotation parameters of ESRI world file. I am not sure about warping > on-the-fly, we may have something to that direction in this new feauture that > was added to OJ .1.6.0 > * adding support for GeoTIFF with transformation matrix georeferencing > courtesy of Nicolas Ribot yeah, committed his code http://sourceforge.net/p/jump-pilot/code/HEAD/tree/core/trunk/src/com/vividsolutions/jump/workbench/imagery/geotiff/GeoTIFFRaster.java#l100 but he basically only interprets the tie points and nothing else. > > Transformation matrix sounds as something that could be created by using the > four corner points of bounding polygon of the image as ground corner poinst. thankful for any points.. please see above > > When it comes to direct editing of WKT, polygon as WKT is not friendly for > editing text directly. Enhanced WKT handling so that "BBOX" or "Envelope" > could be used for inputting a box-like geometry would be nice for this use > cas. I have been writing about this earlier because WMS requests contain > BBOXes and possibility to create polygons by writing the BBOX into WKT box > would be practical. As a programming task it is perhaps not ultimately > difficult (If BBOX found, construct a POLYGON and continue). you lost me here.. could explain more detailed and give a step by step use case? maybe restricted for the topic at hand, image positioning? > > I suggest to keep the direct edit of georeferencing geometries even it is not > totally production ready. Is is still a clever way for georeferencing and it > can be made better later. exactly my point, it's so easy and intuitive, in it's limited way. btw. scaling works for the new Referenced Image reader _only_ currently >Some documentation would be needed to make clear that only resize and move are >usable at the moment. i would really like to ask you to hack a wiki page, after the dust has settled and i can declare the image layer changes to be release ready. >I do not believe we can add constraints so that only those two toold could be >used for editing the image layer geometries but that would be a better >immediate solution. nope, as it is based on the general geometry editing, which does not support limiting beyond prohibiting editing at all. on the other hand it is quite obvious that it doesn't work, isn't it. so user can always undo their latest rotation, or unsupported edit. also, there are loose plans to add a "reset position" button to the LayerManager so users can "undo" their customized postion. be aware, that this repostioning will be saved when saving the layer dataset (as jml/shp/..) and restored when opening it. thanks ..ede ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60133471&iu=/4140/ostg.clktrk _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
