[Inkscape-user] fill areas advice

Hello, I tried to follow the tracing example at http://tavmjong.free.fr/INKSCAPE/MANUAL/html/ATracingExample.html but have difficulties in manipulating my image to what I want. Basically I have three globes (file attached), I have traced the areas, but now I would like to fill the land parts with the colors red, green and blue one for each globe and for this fill to be in a new layer. Can someone please advise on how to achieve this. Many thanks Norman