[Gdal-dev] Warping Plate Carree images to Mercator

[Zhonghai Wang]

Hi Lennox,

http://local.live.com/default.aspx?v=2&cp=0~0&style=h&lvl=1&scene=1875974,

is this an application using ka-map?

zhonghai

On 6/2/06, Lennox Antoine <lxnyce at gmail.com> wrote:
>
> I believe this is the same projection used in VirtualEarth
> (http://local.live.com/default.aspx?v=2&cp=0~0&style=h&lvl=1&scene=1875974
> ),
> so you can check out the projection they used to get it into
> Geographic LL coordinates.
>
> http://www.brains-n-brawn.com/default.aspx?vDir=veworldwind
>
> I'll paste the reprojection area of the code here :
>
> //NOTE tiles did not line up properly with ellps=WGS84
> //string [] projectionParameters = new string[]{"proj=merc",
> "ellps=WGS84", "no.defs"};
> //+proj=longlat +ellps=sphere +a=6370997.0 +es=0.0
> string [] projectionParameters = new string[]{"proj=merc",
> "ellps=sphere", "a=" + earthRadius.ToString(), "es=0.0", "no.defs"};
> proj = new Projection(projectionParameters);
>
> I have also had luck estimating it with tangent and log functions
> without using proj.4.
>
> -Lennox
>
>
> On 6/1/06, Joaquim Luis <jluis at ualg.pt> wrote:
> > I don't know what is the projection of  the Google image. Maybe a Miller
> > cylindrical.
> > I don't know either the proj string to do it.
> > You can look at the GMT cookbook to see many example maps of different
> > projections.
> > (the site seams to be having some problems right now)
> >
> > Joaquim
> > >
> > > Ah, thank you!  That helps, but I still can't figure it out.
> > >
> > > Basically what I'm trying to do is convert this:
> > >
> > >
> http://veimages.gsfc.nasa.gov/7107/world.topo.bathy.200408.3x5400x2700.jpg
> > > <
> http://veimages.gsfc.nasa.gov/7107/world.topo.bathy.200408.3x5400x2700.jpg
> >
> > >
> > > Into something that looks like this:
> > >
> > > http://maps.google.com/?ll=4.915833,56.25&spn=179.778788,360&t=k&om=1
> > > <http://maps.google.com/?ll=4.915833,56.25&spn=179.778788,360&t=k&om=1
> >
> > >
> >
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> >
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