1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<!--Converted with LaTeX2HTML 99.2beta8 (1.46)
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>5.3.1.1 Rectangular map</TITLE>
<META NAME="description" CONTENT="5.3.1.1 Rectangular map">
<META NAME="keywords" CONTENT="GMT_Docs">
<META NAME="resource-type" CONTENT="document">
<META NAME="distribution" CONTENT="global">
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="LaTeX2HTML v99.2beta8">
<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">
<LINK REL="STYLESHEET" HREF="GMT_Docs.css">
<LINK REL="next" HREF="node48.html">
<LINK REL="previous" HREF="node46.html">
<LINK REL="up" HREF="node46.html">
<LINK REL="next" HREF="node48.html">
</HEAD>
<BODY bgcolor="#ffffff">
<!--Navigation Panel-->
<A NAME="tex2html1662"
HREF="node48.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.gif"></A>
<A NAME="tex2html1656"
HREF="node46.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.gif"></A>
<A NAME="tex2html1650"
HREF="node46.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.gif"></A>
<A NAME="tex2html1658"
HREF="node1.html">
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.gif"></A>
<A NAME="tex2html1660"
HREF="node149.html">
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="index.gif"></A>
<BR>
<B> Next:</B> <A NAME="tex2html1663"
HREF="node48.html">5.3.1.2 Hemisphere map</A>
<B> Up:</B> <A NAME="tex2html1657"
HREF="node46.html">5.3.1 Lambert Azimuthal Equal-Area</A>
<B> Previous:</B> <A NAME="tex2html1651"
HREF="node46.html">5.3.1 Lambert Azimuthal Equal-Area</A>
  <B> <A NAME="tex2html1659"
HREF="node1.html">Contents</A></B>
  <B> <A NAME="tex2html1661"
HREF="node149.html">Index</A></B>
<BR>
<BR>
<!--End of Navigation Panel-->
<H3><A NAME="SECTION001331100000000000000">
5.3.1.1 Rectangular map</A>
</H3>
<P>
<A NAME="6773"></A>
<A NAME="6774"></A>
<P>
In this mode we define our region by specifying the
longitude/latitude of the lower left and upper right corners
instead of the usual <I>west, east, south, north</I> boundaries.
The reason for specifying our area this way is that for this
and many other projections, lines of equal longitude and
latitude are not straight lines and are thus poor choices for
map boundaries. Instead we require that the map boundaries be
rectangular by defining the corners of a rectangular map boundary.
Using 0<IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img61.gif"
ALT="$^{o}$">E/40<IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img61.gif"
ALT="$^{o}$">S (lower left) and 60<IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img61.gif"
ALT="$^{o}$">E/10<IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img61.gif"
ALT="$^{o}$">S
(upper right) as our corners we try
<P>
<P>
<BR>
<P>
<BR CLEAR="ALL">
<HR>
<BR>
<PRE>
#!/bin/sh
# $Id: GMT_lambert_az_rect.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
#
gmtset DEGREE_FORMAT 0 GRID_CROSS_SIZE 0
pscoast -R0/-40/60/-10r -JA30/-30/4.5i -B30g30/15g15 -Dl -A500 -G200 -W0.25p -P > \
GMT_lambert_az_rect.ps
</PRE>
<P>
<BR>
<BR>
<P>
<BR CLEAR="ALL">
<HR>
<P>
<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_lambert_az_rect"></A><A NAME="6858"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5.9:</STRONG>
Rectangular map using the Lambert
azimuthal equal-area projection.</CAPTION>
<TR><TD><IMG
WIDTH="607" HEIGHT="374" BORDER="0"
SRC="img71.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_lambert_az_rect.eps}\end{figure}"></TD></TR>
</TABLE>
</DIV><P></P>
<P>
Note that an ``r'' is appended to the <B>-R</B> option to inform
<A NAME="tex2html312"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> that the region has been selected using the rectangle
technique, otherwise it would try to decode the values as
<I>west, east, south, north</I> and report an error since
<I>'east'</I> <IMG
WIDTH="16" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img42.gif"
ALT="$<$"> <I>'west'</I>.
<P>
<HR>
<!--Navigation Panel-->
<A NAME="tex2html1662"
HREF="node48.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.gif"></A>
<A NAME="tex2html1656"
HREF="node46.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.gif"></A>
<A NAME="tex2html1650"
HREF="node46.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.gif"></A>
<A NAME="tex2html1658"
HREF="node1.html">
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.gif"></A>
<A NAME="tex2html1660"
HREF="node149.html">
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="index.gif"></A>
<BR>
<B> Next:</B> <A NAME="tex2html1663"
HREF="node48.html">5.3.1.2 Hemisphere map</A>
<B> Up:</B> <A NAME="tex2html1657"
HREF="node46.html">5.3.1 Lambert Azimuthal Equal-Area</A>
<B> Previous:</B> <A NAME="tex2html1651"
HREF="node46.html">5.3.1 Lambert Azimuthal Equal-Area</A>
  <B> <A NAME="tex2html1659"
HREF="node1.html">Contents</A></B>
  <B> <A NAME="tex2html1661"
HREF="node149.html">Index</A></B>
<!--End of Navigation Panel-->
<ADDRESS>
Paul Wessel
2001-04-18
</ADDRESS>
</BODY>
</HTML>
|
