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K.2 Format required by </A><A NAME="tex2html711"
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<P>
In order to paint continents or oceans it is necessary that the
coastline data be organized in polygons that may be filled.
Simple line segments can be used to draw the coastline, but for
painting polygons are required. Both the WVS and WDB data
consists of unsorted line segments: there is no information
included that tells you which segments belong to the same
polygon (e.g., Australia should be one large polygon).
In addition, polygons enclosing land must be differentiated from
polygons enclosing lakes since they will need different paint.
Finally, we want <A NAME="tex2html712"
HREF="../pscoast.html"><I><B>pscoast</B></I></A><A NAME="15629"></A> to be flexible enough that it can
paint the land <I>or</I> the oceans <I>or</I> both.
If just land (or oceans) is selected we do not want to paint
those areas that are not land (or oceans) since previous plot
programs may have drawn in those areas. Thus, we will need to
combine polygons into new polygons that lend themselves to fill
land (or oceans) only (Note that older versions of <A NAME="tex2html713"
HREF="../pscoast.html"><I><B>pscoast</B></I></A><A NAME="15638"></A>
always painted lakes and wiped out whatever was plotted beneath).
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<ADDRESS>
Paul Wessel
2001-04-18
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