Re: [udig-devel] Re: Re: GPS Coordinates to Map

[Paul Ramsey <pramsey@xxxxxxxxxxxxxxx>]

Right, you will have to convert your DDMM.MM numbers into DD.DDD numbers.

If the coordinates are West or South, they need to be multiplied by -1.

So, the formula is  (W?S? then -1) * (DD + (MM.MMM / 60)) = DD.DDD

P


Quoting Andy Czerwonka <aczerwonka@xxxxxxxx>:

> Thanks.  That perfect.  The only thing now is to deal with the coordinate
> system I think.  GPS comes in in Lat/Long, but I see there a negative number
> for the coordinate.  I have to get:
> 
> >>           4916.46,N    Latitude 49 deg. 16.45 min. North
> >>           12311.12,W   Longitude 123 deg. 11.12 min. West
> 
> into a proper coordinate number.  For example, uDig shows diffent numbers
> (negative numbers) and GPS coordinate need to be transformed first.  I
> know - stup question - but for a geospatial newbie, relevent.  Apologies in
> advance.
> 
> "Jesse Eichar" <jeichar@xxxxxxxxxxxxxxx> wrote in
> message news:20BF789C-0A55-49FC-9B84-ACB7E0320A73@xxxxxxxxxxxxxxx...
> > Hi,
> >
> > So what exactly are you trying to do here?  Just transform from a  point
> > in world space to a coordinate on the screen?  If that is the  case then
> > you can use one of the context's worldToPoint() methods to  make the
> > transformation.  Look at the AbstractContext interface for  the code if
> > you don't want to use the context methods directly (you  can create a
> > ToolContext with the method:   ApplicationGIS.createContext(map).  Also
> > all MapGraphics have access  to a MapGraphics context.  A final place to
> > look is the layer's  layerToMapTransform().
> >
> >
> > Jesse
> >
> 
> 
> 
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
>