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<H3><A NAME="SECTION001243100000000000000">
4.4.3.1 Geographic basemaps</A>
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<P>
Geographic basemaps may differ from regular plot axis in that some projections support a
``fancy'' form of axis and is selected by the <B>BASEMAP_TYPE</B> setting. The annotations
will be formatted according to the <B>PLOT_DEGREE_FORMAT</B> template and <B>DEGREE_SYMBOL</B>
setting. A simple example of part of a basemap is shown in Figure <A HREF="#fig:GMT_-B_geo_1">4.6</A>.
<P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_-B_geo_1"></A><A NAME="18976"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
Geographic map border using separate selections for annotation,
frame, and grid intervals. Formatting of the annotation is controlled by
the parameter <B>PLOT_DEGREE_FORMAT</B> in your <U>.gmtdefaults4</U> file.</CAPTION>
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The machinery for primary and secondary annotations introduced for time-series axes can
also be utilized for geographic basemaps. This may be used to separate
degree annotations from minutes- and seconds-annotations. For a more complicated basemap
example using several sets of intervals, including different intervals and pen attributes
for grid lines and grid crosses, see Figure <A HREF="#fig:GMT_-B_geo_2">4.7</A>.
<P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_-B_geo_2"></A><A NAME="18984"></A>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 4.7:</STRONG>
Geographic map border with both primary (P) and secondary (S) components.</CAPTION>
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<ADDRESS>
Paul Wessel
2010-07-14
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