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<TITLE>5. GMT Projections</TITLE>
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<B> Next:</B> <A NAME="tex2html1427"
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<H1><A NAME="SECTION001300000000000000000">
5. </A><A NAME="tex2html289"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> Projections
</H1>
<P>
<A NAME="tex2html290"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> programs that read position data will need to know how
to convert the input coordinates to positions on the map.
This is achieved by selecting one of several projections.
The purpose of this section is to summarize the properties
of map projections available in <A NAME="tex2html291"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A>, what parameters define
them, and demonstrate how they are used to create simple
basemaps. We will mostly be using the <A NAME="tex2html292"
HREF="../pscoast.html"><I><B>pscoast</B></I></A><A NAME="5727"></A>
command and occasionally <A NAME="tex2html293"
HREF="../psxy.html"><I><B>psxy</B></I></A><A NAME="5736"></A>. (Our illustrations
may differ from yours because of different settings in our
<U>.gmtdefaults</U> file.) Note that while we will
specify dimensions in inches (by appending <B>i</B>), you may
want to use cm (<B>c</B>), meters (<B>m</B>), or points (<B>p</B>)
as unit instead (see <A NAME="tex2html294"
HREF="../gmtdefaults.html"><I><B>gmtdefaults</B></I></A><A NAME="5746"></A> man page).
<P>
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<UL>
<LI><A NAME="tex2html1428"
HREF="node35.html">5.1 Non-map Projections</A>
<UL>
<LI><A NAME="tex2html1429"
HREF="node36.html">5.1.1 Cartesian Linear Projection (<B>-Jx</B> <B>-JX</B>)</A>
<LI><A NAME="tex2html1430"
HREF="node37.html">5.1.2 Logarithmic projection</A>
<LI><A NAME="tex2html1431"
HREF="node38.html">5.1.3 Power projection</A>
<LI><A NAME="tex2html1432"
HREF="node39.html">5.1.4 Geographical linear projection</A>
<LI><A NAME="tex2html1433"
HREF="node40.html">5.1.5 Linear Projection with Polar (<IMG
WIDTH="25" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img2.gif"
ALT="$\theta , r$">)
Coordinates (<B>-Jp </B> <B>-JP</B>)</A>
</UL>
<LI><A NAME="tex2html1434"
HREF="node41.html">5.2 Conic Projections</A>
<UL>
<LI><A NAME="tex2html1435"
HREF="node42.html">5.2.1 Albers Conic Equal-Area Projection (<B>-Jb</B> <B>-JB</B>)</A>
<LI><A NAME="tex2html1436"
HREF="node43.html">5.2.2 Lambert Conic Conformal Projection (<B>-Jl</B> <B>-JL</B>)</A>
<LI><A NAME="tex2html1437"
HREF="node44.html">5.2.3 Equidistant Conic Projection (<B>-Jd</B> <B>-JD</B>)</A>
</UL>
<LI><A NAME="tex2html1438"
HREF="node45.html">5.3 Azimuthal Projections</A>
<UL>
<LI><A NAME="tex2html1439"
HREF="node46.html">5.3.1 Lambert Azimuthal Equal-Area (<B>-Ja </B> <B>-JA</B>)</A>
<UL>
<LI><A NAME="tex2html1440"
HREF="node47.html">5.3.1.1 Rectangular map</A>
<LI><A NAME="tex2html1441"
HREF="node48.html">5.3.1.2 Hemisphere map</A>
</UL>
<LI><A NAME="tex2html1442"
HREF="node49.html">5.3.2 Stereographic Equal-Angle Projection (<B>-Js</B> <B>-JS</B>)</A>
<UL>
<LI><A NAME="tex2html1443"
HREF="node50.html">5.3.2.1 Polar Stereographic Map</A>
<LI><A NAME="tex2html1444"
HREF="node51.html">5.3.2.2 Rectangular Stereographic Map</A>
<LI><A NAME="tex2html1445"
HREF="node52.html">5.3.2.3 General Stereographic Map</A>
</UL>
<LI><A NAME="tex2html1446"
HREF="node53.html">5.3.3 Orthographic Projection (<B>-Jg </B> <B>-JG</B>)</A>
<LI><A NAME="tex2html1447"
HREF="node54.html">5.3.4 Azimuthal Equidistant Projection (<B>-Je </B> <B>-JE</B>)</A>
<LI><A NAME="tex2html1448"
HREF="node55.html">5.3.5 Gnomonic Projection (<B>-Jf</B> <B>-JF</B>)</A>
</UL>
<LI><A NAME="tex2html1449"
HREF="node56.html">5.4 Cylindrical Projections</A>
<UL>
<LI><A NAME="tex2html1450"
HREF="node57.html">5.4.1 Mercator Projection (<B>-Jm</B> <B>-JM</B>)</A>
<LI><A NAME="tex2html1451"
HREF="node58.html">5.4.2 Transverse Mercator (<B>-Jt</B> <B>-JT</B>)</A>
<LI><A NAME="tex2html1452"
HREF="node59.html">5.4.3 Universal Transverse Mercator UTM (<B>-Ju</B> <B>-JU</B>)</A>
<LI><A NAME="tex2html1453"
HREF="node60.html">5.4.4 Oblique Mercator (<B>-Jo</B> <B>-JO</B>)</A>
<LI><A NAME="tex2html1454"
HREF="node61.html">5.4.5 Cassini Cylindrical Projection (<B>-Jc</B> <B>-JC</B>)</A>
<LI><A NAME="tex2html1455"
HREF="node62.html">5.4.6 Cylindrical Equidistant Projection (<B>-Jq</B> <B>-JQ</B>)</A>
<LI><A NAME="tex2html1456"
HREF="node63.html">5.4.7 General Cylindrical Projections (<B>-Jy</B> <B>-JY</B>)</A>
<LI><A NAME="tex2html1457"
HREF="node64.html">5.4.8 Miller Cylindrical Projections (<B>-Jj</B> <B>-JJ</B>)</A>
</UL>
<LI><A NAME="tex2html1458"
HREF="node65.html">5.5 Miscellaneous Projections</A>
<UL>
<LI><A NAME="tex2html1459"
HREF="node66.html">5.5.1 Hammer Projection (<B>-Jh</B> <B>-JH</B>)</A>
<LI><A NAME="tex2html1460"
HREF="node67.html">5.5.2 Mollweide Projection (<B>-Jw</B> <B>-JW</B>)</A>
<LI><A NAME="tex2html1461"
HREF="node68.html">5.5.3 Winkel Tripel Projection (<B>-Jr</B> <B>-JR</B>)</A>
<LI><A NAME="tex2html1462"
HREF="node69.html">5.5.4 Robinson Projection (<B>-Jn</B> <B>-JN</B>)</A>
<LI><A NAME="tex2html1463"
HREF="node70.html">5.5.5 Eckert IV and VI Projection (<B>-Jk</B> <B>-JK</B>)</A>
<LI><A NAME="tex2html1464"
HREF="node71.html">5.5.6 Sinusoidal Projection (<B>-Ji</B> <B>-JI</B>)</A>
<LI><A NAME="tex2html1465"
HREF="node72.html">5.5.7 Van der Grinten Projection (<B>-Jv</B> <B>-JV</B>)</A>
</UL></UL>
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<BR><HR>
<ADDRESS>
Paul Wessel
2001-04-18
</ADDRESS>
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