Re: [Qgis-user] Georeferencing Vector Files

Mon, 10 Aug 2015 12:51:02 -0700

Hello Paolo,

        Good that you can report a different experience, hopefully a better one than mine.  My operating system is W7 and I have many years of experience in GIS, mostly Manifold.

        I have received several suggestions for georeferencing vector files -
  • Vector Bender, VectorGeoreference plug-ins.  Both of these failed due to missing dependencies.  Although the programs are experimental, should not the underlying essential files be in place?
  • Grass V.rectify, v.transform.  I believe these operate through GRASS.  I have gone down so many rabbit holes lately that some of these details are beginning to blur.  I believe the problem here was using GRASS itself.  There seems to be a steep learning curve, particularly with the definition of a mapset.  The whole thing fell apart when the process for defining a Group (why?) required a raster file for a purely vector process.  I have stuck in a dummy raster file and will try again eventually.  This has been hugely time-consuming with nothing to show for it.
        My main complaints are twofold,
  • missing dependencies.  From extensive traffic on this list over the past few weeks, the whole QGIS environment seems to be rife with missing support files.  I understand that this is open source, etc. but surely all the essential pieces should be in place.  When I attempt to install Vector Bender, it reports missing dependencies and packs up.  Why doesn't it just install the missing dependencies, it seems to know what and where they are?
  • Installation confusion.  Again, from the above traffic there is much discussion about the two different methods of installing QGIS, one is apparently prone to problems.  So why is it still available, in fact why are there two different installation processes at all?  Anyway, I recently installed 2.10 using the non-standalone installer.  I chose the advanced option, as I do with most programs I install, believing that I could customize the items being installed.  This resulted in over 101,000 file being installed, which I found out later is the wrong approach.  A better option is to use Express Install which actually does offer some customization options.  This terminology is out of step with most programs where express install implies a limited feature set with no options being offered during the process.
         Anyway, having done that I now have 2.10 but GRASS appears to be only available as a standalone program, whereas before in 2.8 it was available under the plug-in menu option.  Why is there not a consistent interface?

        To sum up, no software, even free, should be offered with missing dependencies.  If it doesn't work, don't offer it.  And the plethora of installation options is highly confusing and time wasting to say the least.  I am prepared to spend countless hours learning how to use the abundant and powerful features of all these programs, but don't feel I should need an IT degree to merely install them and run the various tools.

        My initial enthusiasm for QGIS has been dampened considerably due to the huge number of hours I have wasted trying to use tools that actually do exist to address my particular needs.

                 Thank you Cheers . . . . . . . . Spring Harrison



At 10-08-2015 10:32 Monday, Paolo Cavallini wrote:
Hi.
I have a different experience. Please report the issues you encountered, that's the first step to fix them.
All the best.

Il 10 agosto 2015 18:24:28 CEST, Springfield Harrison <stellar...@gmail.com> ha scritto:

Good news! I've struggled with the mapset idea and gave up.  Actually, it was the Group thing that finished me off.

I'll look again in the processing tool box, I don't remember seeing it.

I just (re)installed 2.10 but options seem to come and go at random. For me, QGIS is great but all the install failures and missing dependencies have put me off.  I've tried many plugins that won't run.

Thanks . . .  Â

Cheers . . . . .  Spring
Samsung Tab 4
On Aug 10, 2015 3:27 AM, "Thomas Colley" < it...@neath-porttalbot.gov.uk> wrote:
Hi

I did this recently using the GRASS command v.transform.pointsfile from the Processing Toolbox in QGIS. No need to actually go into GRASS and create Mapsets.

This worked really well for me for unreferenced DXFs. If you need any more info let me know.

Cheers

Tom


-----Original Message-----
From: qgis-user-boun...@lists.osgeo.org [ mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Springfield Harrison
Sent: 09 August 2015 19:51
To: t...@wildintellect.com; qgis-user
Subject: Re: [Qgis-user] Georeferencing Vector Files

Ok, thanks. I'm installing QGIS on W7 yet again, trying to achieve better functionality. That is a challenge in itself, prone to wrong turns. Hopefully the VectorGeoref will then work.

This whole install process is a real piece of work . . . . .

         Thanks again, cheers . . . .  Spring Harrison



At 09-08-2015 10:52 Sunday, Alex Mandel wrote:
>ogr2ogr is a command line tool, Terminal/Shell on Mac/Linux, OSGeo4w
>shell on Windows.
>
>Supposedly the Vector Georef plugin wraps this functionality into QGIS.
>
>-Alex
>
>On 08/09/2015 12:08 AM, Springfield Harrison wrote:
> > Right, but where is org2org? I've looked in many menu items, help, etc.
> > to no avail.
> >
> > Sorry to be a bit thick but how is it accessed?
> >
> > Also, GRASS has v.transform and v.rectify but starting a new GRASS
> > mapset fails with no reason given.
> >
> > Great tools but why are they so hard to access?
> >
> >    Thanks, cheers . . . . Spring Harrison
> >
> >
> >
> > At 08-08-2015 23:20 Saturday, Alex Mandel wrote:
> >> Save the whole map, it's on the main File menu, it just saves the
> >> current canvas.
> >>
> >> If you already have a list of gcps you can skip that step
> >>
> >> Example
> >>
> http://gis.stackexchange.com/questions/107298/process-to-georeference-
> corners-of-vector-file
> >>
> >>
> >>
> >> Enjoy,
> >> Alex
> >>
> >> On 08/08/2015 07:26 PM, Springfield Harrison wrote:
> >> > Hello Alex,
> >> >
> >> >Â Â Â Â Further to my last, for Vector Save As, I couldn't find any
> >> > option to save it as a raster file. Is there some other place to look?
> >> >
> >> >Â Â Â Â Â Â Â Â Thanks again, Cheers . . . . . . . . Spring
> >> > Harrison
> >> >
> >> >
> >> >
> >> >
> >> > At 08-08-2015 12:07 Saturday, Alex Mandel wrote:
> >> >> On 08/06/2015 11:08 AM, Springfield Harrison wrote:
> >> >> > Hello All,
> >> >> >
> >> >> > Is there a tool/plugin for georeferencing vector files to an
> >> existing
> >> >> > projected layer?
> >> >> >
> >> >> > I'm intending to bring in property survey drawings that have
> >> >> > only
> >> local
> >> >> > coordinates but projected coordinates (UTM) are available for
> >> >> > some
> >> >> corners.
> >> >> >
> >> >> > Thank you . . . .
> >> >> >
> >> >> > Cheers . . . . . Springfield Harrison Samsung Tab 4
> >> >> >
> >> >> >
> >> >>
> >> >> My trick, is convert the vector an image in QGIS (Save Image)
> >> >> Georeference the image, saving the control point list out to a file.
> >> >> You can then use these control points (gcps) with ogr2ogr to transform
> >> >> the original vector.
> >> >>
> >> >> -Alex
> >> >
> >> > _______________________________________________
> >> > Qgis-user mailing list
> >> > Qgis-user@lists.osgeo.org
> >> > http://lists.osgeo.org/mailman/listinfo/qgis-user
> >

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Paolo Cavallini
http://www.faunalia.eu 
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