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<H2><A NAME="SECTION00321000000000000000">
1.2.1 Input data</A>
</H2>
A <A NAME="tex2html55"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> program may or may not take input files. Three different
types of input are recognized (more details can be found in Appendix
B in the Technical Reference):
<A NAME="154"></A>
<A NAME="155"></A>
<P>
<OL>
<LI>Data tables.
These are ``spreadsheet'' tables with a fixed number of columns and
unlimited number of rows. We distinguish between two groups:
<P>
<UL>
<LI>ASCII (Preferred unless files are huge)
<P>
<DL>
<DT><STRONG>-</STRONG></DT>
<DD>Single segment [Default]
<P>
</DD>
<DT><STRONG>-</STRONG></DT>
<DD>Multi-segment with internal header records (<B>-M</B>)
</DD>
</DL>
<P>
</LI>
<LI>Binary (to speed up input/output)
<P>
<DL>
<DT><STRONG>-</STRONG></DT>
<DD>Single segment [Default]
<P>
</DD>
<DT><STRONG>-</STRONG></DT>
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</DD>
</DL>
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</LI>
</UL>
<P>
</LI>
<LI>Gridded dated sets.
These are data matrices (evenly spaced in two coordinates) that come
in two flavors:
<P>
<UL>
<LI>Grid-line registration
<P>
</LI>
<LI>Pixel registration
<P>
</LI>
</UL>
<P>
You may choose among several file formats (even define your own format),
but the <A NAME="tex2html56"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> default is netCDF.
<P>
</LI>
<LI>Color palette table (For imaging, color plots, and contour maps).
We will discuss these later.
<P>
</LI>
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<ADDRESS>
Paul Wessel
2001-04-18
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