Sophie: GMT-doc-4.5.3-3.fc14 noarch

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>4.5 Perspective views</TITLE>
<META NAME="description" CONTENT="4.5 Perspective views">
<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="previous" HREF="node55.html">
<LINK REL="up" HREF="node49.html">
<LINK REL="next" HREF="node58.html">
</HEAD>

<BODY  bgcolor="#ffffff">
<!--Navigation Panel-->
<A NAME="tex2html1204"
  HREF="node58.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> 
<A NAME="tex2html1198"
  HREF="node49.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> 
<A NAME="tex2html1194"
  HREF="node56.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> 
<A NAME="tex2html1200"
  HREF="node1.html">
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> 
<A NAME="tex2html1202"
  HREF="node63.html">
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="index.png"></A> 
<BR>
<B> Next:</B> <A NAME="tex2html1205"
  HREF="node58.html">4.5.1 Mesh-plot</A>
<B> Up:</B> <A NAME="tex2html1199"
  HREF="node49.html">4. SESSION FOUR</A>
<B> Previous:</B> <A NAME="tex2html1195"
  HREF="node56.html">4.4.1 Exercises</A>
 &nbsp; <B>  <A NAME="tex2html1201"
  HREF="node1.html">Contents</A></B> 
 &nbsp; <B>  <A NAME="tex2html1203"
  HREF="node63.html">Index</A></B> 
<BR>
<BR>
<!--End of Navigation Panel-->

<H1><A NAME="SECTION00650000000000000000"></A>
<A NAME="1452"></A>
<BR>
4.5 Perspective views
</H1>

<P>
Our final undertaking in this tutorial is to examine three-dimensional
perspective views.  <A NAME="tex2html238"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> is currently limited to vantage points at
infinity; thus we are unable to do fly-by's through canyons etc.  The
<A NAME="tex2html239"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> module that produces perspective views of gridded data files is
<A NAME="tex2html240"
  HREF="../man/grdview.html"><I><B>grdview</B></I></A><A NAME="2601"></A>.  It can make two kinds of plots:

<P>

<OL>
<LI>Mesh or wire-frame plot (with or without superimposed contours)

<P>
</LI>
<LI>Color-coded surface (with optional shading, contours, or draping).

<P>
</LI>
</OL>

<P>
Regardless of plot type, some arguments must be specified; these are

<P>

<OL>
<LI><I>relief_file</I>; a gridded data set of the surface.

<P>
</LI>
<LI><B>-J</B> for the desired map projection.

<P>
</LI>
<LI><B>-JZ</B><I>height</I> for the vertical scaling.

<P>
</LI>
<LI><B>-E</B><I>azimuth</I>/<I>elevation</I> for vantage point.

<P>
</LI>
</OL>

<P>
In addition, some options may be required:

<P>
<BR><P></P>
<DIV ALIGN="CENTER"><A NAME="1645"></A>
<TABLE>
<CAPTION><STRONG>Table 4.5:</STRONG>
The most useful options in <A NAME="tex2html235"
  HREF="../man/grdview.html"><I><B>grdview</B></I></A><A NAME="2619"></A>.</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>-C</B></FONT><FONT SIZE="-1"><I>cptfile</I> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> The </FONT><FONT SIZE="-1"><I>cptfile</I> is required for color -coded surfaces and for contoured mesh plots </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-G</B></FONT><FONT SIZE="-1"><I>drape_file</I> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Assign colors using </FONT><FONT SIZE="-1"><I>drape_file</I> instead of </FONT><FONT SIZE="-1"><I>relief_file</I> </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-I</B></FONT><FONT SIZE="-1"><I>intens_file</I> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> File with illumination intensities </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-Qm</B> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Selects mesh plot </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-Qs</B>[</FONT><FONT SIZE="-1"><B>m</B>] </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Surface plot using polygons; append </FONT><FONT SIZE="-1"><B>m</B> to show mesh.  This option allows for <B>-W</B> </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-Qi</B></FONT><FONT SIZE="-1"><I>dpi</I>[</FONT><FONT SIZE="-1"><B>g</B>] </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Image by scan-line conversion.  Specify </FONT><FONT SIZE="-1"><I>dpi</I>; append </FONT><FONT SIZE="-1"><B>g</B> to force gray-shade image.  <B>-B</B> is disabled. </FONT></TD>
</TR>
<TR><TH ALIGN="LEFT"><FONT SIZE="-1">  
<B>-W</B></FONT><FONT SIZE="-1"><I>pen</I> </FONT></TH>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Draw contours on top of surface (except with <B>-Qi</B>) </FONT></TD>
</TR>
</TABLE><FONT SIZE="-1">

<A NAME="tbl:grdview"></A></FONT></DIV></TD></TR>
</TABLE>
</DIV><P></P>
<BR>

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

<UL>
<LI><A NAME="tex2html1206"
  HREF="node58.html">4.5.1 Mesh-plot</A>
<UL>
<LI><A NAME="tex2html1207"
  HREF="node59.html">4.5.1.1 Exercises</A>
</UL>
<BR>
<LI><A NAME="tex2html1208"
  HREF="node60.html">4.5.2 Color-coded view</A>
<UL>
<LI><A NAME="tex2html1209"
  HREF="node61.html">4.5.2.1 Exercises</A>
</UL></UL>
<!--End of Table of Child-Links-->
<HR>
<!--Navigation Panel-->
<A NAME="tex2html1204"
  HREF="node58.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> 
<A NAME="tex2html1198"
  HREF="node49.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> 
<A NAME="tex2html1194"
  HREF="node56.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> 
<A NAME="tex2html1200"
  HREF="node1.html">
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> 
<A NAME="tex2html1202"
  HREF="node63.html">
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="index.png"></A> 
<BR>
<B> Next:</B> <A NAME="tex2html1205"
  HREF="node58.html">4.5.1 Mesh-plot</A>
<B> Up:</B> <A NAME="tex2html1199"
  HREF="node49.html">4. SESSION FOUR</A>
<B> Previous:</B> <A NAME="tex2html1195"
  HREF="node56.html">4.4.1 Exercises</A>
 &nbsp; <B>  <A NAME="tex2html1201"
  HREF="node1.html">Contents</A></B> 
 &nbsp; <B>  <A NAME="tex2html1203"
  HREF="node63.html">Index</A></B> 
<!--End of Navigation Panel-->
<ADDRESS>
Paul Wessel
2010-07-14
</ADDRESS>
</BODY>
</HTML>