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

[Alexandre Neto]

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.

When you say band, you are talking about the latitude bands or are you
talking UTM zones? If its the Latitude band it should not be a problem, if
it is the zones, they overlap so you will probably will have to convert them
to a common coordinate system.

Hope I have helped.

Alexandre Neto

On Mon, May 16, 2011 at 3:12 PM, DB <Freddog_de at yahoo.co.uk> wrote:

> 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?
>
> Assuming we can do that... does Qgis take account of two UTM bands meeting
> in the middle of our map?
>
> And then.. if I try to measure a distance on the map (which crosses over
> the UTM bands), will the distance be correctly-ish returned in metres? & I
> guess a follow up to that is, OK, I recognise that if I mak my line with the
> mouse, it should be ok; but if i enter UTM coordinates, will the distance
> between the points be correct?
>
> I suppose really, my first question ought to be - is Qgis the right program
> for what I want to try to do or is there something else in the Linux box
> which would be more appropriate???
>
> Many thanks to all who have produced Qgis, it seems to be a marvellous
> piece of software (if only I understood all that it was about!)
>
> Dave
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