[Qgis-user] New starter on QGIS & I need help!!!!!

[Saber Razmjooei]

If you are in UK (as your email suggests), you are more than welcome to
join a free QGIS workshop we are holding in July:

http://www.faunalia.co.uk/en/courses/beginning


Regards
Saber


On Sun, 2011-06-05 at 14:23 +0200, DB wrote:
> On 05/16/2011 06:01 PM, pcreso at pcreso.com wrote:
> > Click plugins, manage plugins then locate and enable Georeferencer
> > (you may need to download Python plugins first)
> >
> > Use this tool to click on points on the map, & specify/enter the UTM
> >  coordinates for these points.
> >
> > Do this for several points scattered throughout the image. Once done
> >  (accurately!) QGIS will correctly locate the image on the map, and
> > therefore properly place any points or lines overlaid on it.
> >
> > This is not the only way, but is perhaps the simplest.
> >
> >
> > HTH,
> >
> > Brent Wood
> 
> >> Hello Dave,
> >
> > I believe that QGIS is in fact the right tool for you to use.
> >
> > In a normal case you would need to load both .map file in QGIS. Then
> > using the georeferencer plugin, load the JPG and start giving known
> > coordinates (the ozi file points, using the "From map canvas tool")
> > to places on your image. After at you will be able to georeference
> > the imagem and load it in QGIS.
> >
> > With a bit of luck, all the points in your ozi file are in the same
> > coordinate system (It would be very strange if it didn't...),
> > probably WGS84 geographic coordinates and you don't need to worry at
> > all.
> > Hope I have helped.
> >
> > Alexandre Neto
> 
> 
> > --- On *Tue, 5/17/11, DB /<Freddog_de at yahoo.co.uk>/* wrote:
> >
> >
> > From: DB <Freddog_de at yahoo.co.uk> Subject: [Qgis-user] New starter on
> > QGIS & I need help!!!!! To: qgis-user at lists.osgeo.org Date: Tuesday,
> > May 17, 2011, 2:12 AM
> >
> > Hi all,
> >
> > I've just loaded Qgis under Fedora 14 to try and do some of the
> > things that happen in Oziexplorer. (I'm an official at a number of
> > Hot Air Balloon competitions where Ozi is currently used for
> > evaluating GPS tracks)
> >
> > I've managed to get our (next)competition map loaded into qgis, but
> > haven't yet found a way to fix the scale of the map. It is a 50000
> > map which has been scanned to jpeg. We also have an ozi .map file
> > which would appear to my pretty much untrained eye to be the info
> > which identifies the UTM coordinate system in use on the map.
> >
> > My first question to you guys is... how do I tell qgis to convert the
> > pixel(?) counts to UTM grid?
> >
> 
> Hi Brent & Alexandre,
> 
> Thanks for your help....  B u t.. after a lot of playing with qgis &
> Georeferencer, I'm still stuck!
> 
> I guess there must be a clarification hidden in a document "Somewhere
> over the rainbow", but I have to confess, I can't find it - usual
> problem of an otsider coming in & expecting everything to work
> automatically, RTFM only to be done as a last step!
> 
> OK... so I started Georef, saw how the information got put out & made a
> file containing the 9 UTM cross points as given in Ozi's .map file.
> Restarted, danced 3 times round the maypole & eventually got my 9 points
> to plot on the Georef mini-map & the QGIS big map - yippee!  and in the 
> right places!!  BUT I don't
> seem to be able to tell anything what these 9 points represent.
> 
> In Ozi .map, I have
> 
> point01,xy,2412, 2380,in,deg, , ,N, , , W,grid,31,704000,5552000,N
> point02..... etc.  In Georef all I appear to be able to input is
> 2411.496,-2379.907 under SrcX & Y, which turns into
> 
> mapX,mapY,pixelX,pixelY,enable
> 2412.000000000000000,-2380.000000000000000,2412.909978693178800,-2382.054865056816197,1
> in the GCP "points" file
>   Nowhere for the UTM 31 N 704000 5552000.
> 
> If I double click on any of the boxes in the table, I get sent of to a
> transformation panel which might as well be written in hieroglyphs for
> all I understand of it!
> 
> I selected
> Transformation Type: Linear
> Resampling method: Linear
> Output raster: /home/Dave/Desktop/Luxgsm/map/trial_01
> Target SRS: EPSG:32631
> Set Target Resolution: on
> Horizontal: 1.00000
> Vertical: -1.00000
> Load in QGIS when done: on
> 
> With this I get on the Georef window bottom panel:
> Transform: Linear Translation (-0.326581, 0.800639) Scale (1.00004,
> 1.00008) Rotation: 0 Mean error 0.717116, followed by the current mouse
> coordinates.
> 
> I guess (!) I'm quite a long way into my trial, but, like Hansel &
> Gretel, I can't see wood for trees!!!  I've tried the qgis "easy
> guide", but it doesn't appear to go where I want;  I tried the Georef
> help....  At least I now know that a GCP is a Ground Control Point!
> 
> So, my plaintive voice in the wilderness(!!), can someone either give me
> a cook-book sequence of How-tos to make Qgis recognise my UTM grid(s) or
> point me to a Beginners Guide somewhere in I'net space????
> 
> BTW, I have to deal with 2 UTM bands 31N & 32N.
> 
> Many, many thanks for any help
> 
> Dave
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