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Subject: [ggl] map to cartesian
From: Barend Gehrels (Barend.Gehrels)
Date: 2010-03-30 08:15:21

Hi Fausto,

fausto wrote:
> Hi Barend, all,
> regarding transformations from one coordinate system to another, I can
> see that the example below mentions Map projectons.
> Is there a way to transform GIS positions into simple cartesian x,y
> positions.
> If you were to draw a country loaded from a kml file or shapefile, how
> would you proceed?
> I guess you need to transform the lat/long vertex positions into x,y
> and apply the polygon geometry for each set of x,y pairs.
> How ggl can help in this context?

Sure this is possible.

which, in this case, reads from WKT (world countries), project the
countries using the Mollweide Map Projection and outputs to SVG.

> I guess it's also possible to use the simplification functions
> provided with ggl in this context, right?
Yes, you can use them as well, either the lat-long coordinates, or the
projected coordinates, or the coordinates in SVG-coordinate system.

Regards, Barend

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