Yes, I know it needs a lot of work, but it does kind of work sometimes.
Thing is, I could never get scanned maps to match up all that well; we may
need support for more projections (like plain lat/lon plotting). But anyway,
the parameters are as follows:
X (easting) scale mpp: the scale of the map in the X direction. "mpp" stands
for meters per pixel, but this is only in units of meters per pixel in UTM
mode, otherwise it is Viking's "zoom factor" units, which are related to the
size of Google Maps / OpenStreetMap tiles. The map will only show if we are
zoomed to this zoom level.
Y (easting) scale mpp: the scale of the map in the Y direction. Again, the
layer will only draw if we are at this zoom level in the Y direction. (the
two numbers i.e. '4.000/4.000' show the zoom level; goto View->Zoom To to
change it)
Corner pixel easting: the UTM "easting" value of the upper-right corner
pixel of the map. (try going to View->Go to UTM... to see your current
location in UTM). Note that the map is drawn in any UTM zone.
Corner pixel northing: the UTM "easting" value of the upper-right corner
pixel of the map.
These four parameters are actually somewhat of a standard in Georeferencing
maps, at least it's one common way the parameters are given.
There are two tools to help fit a map. First get the map to show on the
screen (for instance by putting your current location in UTM and current
zoomfactor in for the above parameters).
Georef Move Map: drag and drop to move the map around the screen
Georef Zoom Tool: change the Viking zoom factor AND the zoom factor for the
georef map; this has the effect of changing the size of everything else but
the map. This is useful for trying to fit a map to a track or another map
(to forse another map to scale at that zoom level, set the "Zoom Level"
setting in MapLayer's properties; then maps from this zoom level will be
scaled to Viking's zoom level. You'd probably also want to set Alpha).
Right- and left-click to change the scale by 1%. (You may have to pan again
to see the change in lowers under this, this is a bug)
Of course, using these tools aren't as good as properly georeferencing the
map calculating the parameters from known points. I started a program to do
this once... but there are probably many now.
Evan
On Mon, Sep 21, 2009 at 9:40 AM, Jochen Kunz <jk...@unixag-kl.fh-kl.de>wrote:
> On Sun, 20 Sep 2009 19:56:34 +0200
> Guilhem Bonnefille <guilhem.bonnefi...@gmail.com> wrote:
>
> > Yes, be really convinced that such feature is a recurrent request:
> > "I want to use my scanned map, how to do that in viking?"
> Ohhh, yes. This is really a FAQ and I am still looking for an answer to
> that FAQ. I really can't make any sense out of the parameters for the
> GeoRef Map layer.
> --
>
>
> tschüß,
> Jochen
>
> Homepage:
> http://www.unixag-kl.fh-kl.de/~jkunz/<http://www.unixag-kl.fh-kl.de/%7Ejkunz/>
>
>
>
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