On Fri, Oct 23, 2015 at 1:37 PM, Anna Petrášová <kratocha...@gmail.com> wrote:
> > On Oct 23, 2015 6:04 AM, "Johannes Radinger" <johannesradin...@gmail.com> > wrote: > > > > > > > > On Fri, Oct 23, 2015 at 11:19 AM, Moritz Lennert < > mlenn...@club.worldonline.be> wrote: > >> > >> On 23/10/15 10:56, Johannes Radinger wrote: > >>> > >>> > >>> > >>> On Fri, Oct 23, 2015 at 10:17 AM, Moritz Lennert > >>> <mlenn...@club.worldonline.be <mailto:mlenn...@club.worldonline.be>> > wrote: > >>> > >>> On 22/10/15 16:25, Johannes Radinger wrote: > >>> > >>> Dear GRASS users, > >>> > >>> Today I wanted to try the georectification tool g.gui.gcp in > >>> GRASS 7 for > >>> the first time. I was basically following the description on > the > >>> GRASS > >>> wiki (https://grasswiki.osgeo.org/wiki/Georeferencing). In > >>> particular, I > >>> have a photograph from my camera with known reference points > which I > >>> load into an unprojected XY location. My target location should > >>> also be > >>> a XY location as the picture is taken from a "virtual" > coordinate > >>> system. Inside my target XY-location I try to open g.gui.gcp > and > >>> select > >>> raster, and the location and mapset where my photograph is > >>> stored. When > >>> I want to click next I get following error/message: "You must > >>> select a > >>> valid location and mapset in order to continue" and I can't > >>> proceed with > >>> the rectification. Just this GUI message appears, no > >>> error/warning in > >>> the grass console etc. I am puzzled how to interpret that? What > >>> is wrong > >>> with the location/mapset? The mapset I've selected is existing > >>> (I can > >>> select it from the dropdown menu). I tried to select any other > >>> location/mapset but receive always the same message. > >>> > >>> > >>> > >>> Georectification is for georeferencing to a projected system. It > >>> does not make sense to georeference to an XY-location. > >>> > >>> I see two options for you: > >>> > >>> - Import you image directely into the target region and use > r.region > >>> to adjust its boundary coordinates > >>> - Define your own projection system to fit your needs. > >>> > >>> > >>> So far as I understand georectification and orthorectification in > >>> particular is to rectify a picture/photo/image based on spatially > >>> defined ground control points which might not be done by just adjusting > >>> the boundary coordinates. BTW I also tried the European LAEA coordinate > >>> system (EPSG 3035) as a target location which is not working either > here > >>> in my machine/setup (same message as already mentioned). Here > >>> ( > https://www.dropbox.com/s/snjzd8eu7b8115k/2015-10-22%2015.26.30.jpg?dl=0) > >>> you can find a a photo (*.jpg) which is an "areal" photo with known 3d > >>> coordinates for the single points (ground control points). I think this > >>> example clarifies and illustrates what I intend to do and why the > target > >>> system can also be a XY location in my opinion. A rectification of this > >>> image should make the lines of the grid more or less parallel. Or do I > >>> get something completely wrong? > >> > >> > >> Actually, I was wrong: I don't get any complaint trying to use > g.gui.gcp to georectify from XY to XY. So there seems to be an issue with > your XY locations. > >> > >> Have you tried recreating the locations from scratch ? > > > > > > Your results look really reasonable.... that's what I was looking for... > > > > Actually, both XY locations are created from scratch (via the location > wizzard) > > I get following output for both XY locations: > > > > g.proj -p > > > XY location (unprojected) > > > > I tried to start the GCP manager from within different other locations > (e.g. laea, datum: etrs89) and selecting different source location (e.g. > WGS84)....however I always get the same message. So I guess this is not > specifically related to my location but rather to the GCP manager/WX GUI? > As I don't get an error message it is difficult to judge what is going > wrong in my case... > > > > I just looked up the source code and the error message seems to be > related to follwoing line: > > > https://trac.osgeo.org/grass/browser/grass/branches/releasebranch_7_0/gui/wxpython/gcp/manager.py#L399 > > As far as I understand, this error message is only given if no > location/mapset is provided; however that is not the case here. Maybe my > selection of the location/mapset via the GUI does not get parsed > further....? > > > > Strange that orthorectification from one XY to antother XY location > works on other machines but not on mine. > > > > PS: As an important side note: I am working on Ubuntu which is installed > on a virtual machine (VMWare) on our server. I remotely connect to this > virtual machine via RDP > > I noticed you have strange version of wxpython. Any chance you could test > on machine with version 2.8.12.0 or a stable 3 version? > Indeed, I upgraded now to wxpython 3.0.1.0 and the GCP manager is working now! YES!. At least my location/mapset settings are accepted and I get to the next step. So now I can actually test and try the GCP manager. Thanks for your help! /Johannes > Anna > > > >> > >> > >> Moritz > > > > > > > > _______________________________________________ > > grass-user mailing list > > grass-user@lists.osgeo.org > > http://lists.osgeo.org/mailman/listinfo/grass-user >
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