Sophie

Sophie

distrib > Fedora > 14 > x86_64 > media > os > by-pkgid > 4b194777eaf705e440bb2ce282d32772 > files > 849

GMT-doc-4.5.3-3.fc14.noarch.rpm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">

<!--Converted with LaTeX2HTML 2002-2-1 (1.71)
original version by:  Nikos Drakos, CBLU, University of Leeds
* revised and updated by:  Marcus Hennecke, Ross Moore, Herb Swan
* with significant contributions from:
  Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
<HTML>
<HEAD>
<TITLE>1.4.3 Mercator projection</TITLE>
<META NAME="description" CONTENT="1.4.3 Mercator projection">
<META NAME="keywords" CONTENT="GMT_Tutorial">
<META NAME="resource-type" CONTENT="document">
<META NAME="distribution" CONTENT="global">

<META NAME="Generator" CONTENT="LaTeX2HTML v2002-2-1">
<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">

<LINK REL="STYLESHEET" HREF="GMT_Tutorial.css">

<LINK REL="next" HREF="node27.html">
<LINK REL="previous" HREF="node23.html">
<LINK REL="up" HREF="node20.html">
<LINK REL="next" HREF="node26.html">
</HEAD>

<BODY  bgcolor="#ffffff">
<!--Navigation Panel-->
<A NAME="tex2html744"
  HREF="node26.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> 
<A NAME="tex2html738"
  HREF="node20.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> 
<A NAME="tex2html732"
  HREF="node24.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> 
<A NAME="tex2html740"
  HREF="node1.html">
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> 
<A NAME="tex2html742"
  HREF="node63.html">
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="index.png"></A> 
<BR>
<B> Next:</B> <A NAME="tex2html745"
  HREF="node26.html">1.4.3.1 Exercises</A>
<B> Up:</B> <A NAME="tex2html739"
  HREF="node20.html">1.4 Laboratory Exercises</A>
<B> Previous:</B> <A NAME="tex2html733"
  HREF="node24.html">1.4.2.1 Exercises</A>
 &nbsp; <B>  <A NAME="tex2html741"
  HREF="node1.html">Contents</A></B> 
 &nbsp; <B>  <A NAME="tex2html743"
  HREF="node63.html">Index</A></B> 
<BR>
<BR>
<!--End of Navigation Panel-->

<H2><A NAME="SECTION00343000000000000000">
1.4.3 Mercator projection</A>
</H2>
<A NAME="1552"></A>
<A NAME="521"></A>

<P>
Despite the problems of extreme horizontal exaggeration at high
latitudes, the conformal Mercator projection (<B>-JM</B>) remains
the stalwart of location maps used by scientists.  It is one
of several cylindrical projections offered by <A NAME="tex2html94"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A>; here we
will only have time to focus on one such projection.  The
complete syntax is simply 
<BR>
<P>
<B>-JM</B><I>width</I> 
<BR>
<P>
To make coastline maps we use <A NAME="tex2html95"
  HREF="../man/pscoast.html"><I><B>pscoast</B></I></A><A NAME="1935"></A> which automatically will
access the <A NAME="tex2html96"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> coastline data base derived from the GSHHS
database<A NAME="tex2html92"
  HREF="footnode.html#foot1553"><SUP>1.1</SUP></A>.  In addition
to the common switches we may need to use some of several <A NAME="tex2html97"
  HREF="../man/pscoast.html"><I><B>pscoast</B></I></A><A NAME="1943"></A>
-specific options (see Table&nbsp;<A HREF="#tbl:pscoast">1.2</A>).

<P>
<BR><P></P>
<DIV ALIGN="CENTER"><A NAME="552"></A>
<TABLE>
<CAPTION><STRONG>Table 1.2:</STRONG>
Main options when making coastline plots or overlays.</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER"><TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1">
<I>Option</I></FONT></TD>
<TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1"> <I>Purpose</I></FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">   
<B>-A</B> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Exclude small features or those of high hierarchical levels (see Appendix K)</FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-D</B> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Select data resolution (</FONT><FONT SIZE="-1"><B>f</B>ull, </FONT><FONT SIZE="-1"><B>h</B>igh, </FONT><FONT SIZE="-1"><B>i</B>ntermediate, </FONT><FONT SIZE="-1"><B>l</B>ow, or </FONT><FONT SIZE="-1"><B>c</B>rude) </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-G</B> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Set color of dry areas (default does not paint) </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-I</B> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Draw rivers (chose features from one or more hierarchical categories) </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-L</B> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Plot map scale (length scale can be km, miles, or nautical miles) </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-N</B> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Draw political borders (including US state borders) </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-S</B> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Set color for wet areas (default does not paint) </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-W</B> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Draw coastlines and set pen thickness </FONT></TD>
</TR>
</TABLE><FONT SIZE="-1">
 <A NAME="tbl:pscoast"></A></FONT></DIV></TD></TR>
</TABLE>
</DIV><P></P>
<BR>

<P>
One of <B>-W</B>, <B>-G</B>, <B>-S</B> must be selected.  Our first coastline
example is from Latin America:

<P>
<PRE>
pscoast -R-90/-70/0/20 -JM6i -P -B5g5 -Gchocolate &gt; map.ps
</PRE>

<P>
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>

<UL>
<LI><A NAME="tex2html746"
  HREF="node26.html">1.4.3.1 Exercises</A>
</UL>
<!--End of Table of Child-Links-->
<HR>
<!--Navigation Panel-->
<A NAME="tex2html744"
  HREF="node26.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> 
<A NAME="tex2html738"
  HREF="node20.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> 
<A NAME="tex2html732"
  HREF="node24.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> 
<A NAME="tex2html740"
  HREF="node1.html">
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> 
<A NAME="tex2html742"
  HREF="node63.html">
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="index.png"></A> 
<BR>
<B> Next:</B> <A NAME="tex2html745"
  HREF="node26.html">1.4.3.1 Exercises</A>
<B> Up:</B> <A NAME="tex2html739"
  HREF="node20.html">1.4 Laboratory Exercises</A>
<B> Previous:</B> <A NAME="tex2html733"
  HREF="node24.html">1.4.2.1 Exercises</A>
 &nbsp; <B>  <A NAME="tex2html741"
  HREF="node1.html">Contents</A></B> 
 &nbsp; <B>  <A NAME="tex2html743"
  HREF="node63.html">Index</A></B> 
<!--End of Navigation Panel-->
<ADDRESS>
Paul Wessel
2010-07-14
</ADDRESS>
</BODY>
</HTML>

Perl :: Catalyst :: PostgreSQL :: RPM Valid HTML 4.01 Transitional