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<HTML>
<HEAD>
<TITLE>grdedit</TITLE>
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<BODY>
<H1>grdedit</H1>
<HR>
<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
grdedit - Modifying the header in a 2-D grdfile
</PRE>
<H2>SYNOPSIS</H2><PRE>
<B>grdedit</B> <I>grdfile</I> [ <B>-A</B> ] [ <B>-D</B><I>xunit/yunit/zunit/scale/off</I>
<I>set/title/remark</I> ] [ <B>-R</B><I>west/east/south/north</I>[<B>r</B>] ] [ <B>-S</B> ] [
<B>-V</B> ]
</PRE>
<H2>DESCRIPTION</H2><PRE>
<B>grdedit</B> reads the header information in a binary 2-D grd
file and replaces the information with values provided on
the command line [if any]. As an option, global, geograph
ical grids (with 360 degrees longitude range) can be
rotated in the east-west direction. <B>grdedit</B> only operates
on files containing a grdheader.
No space between the option flag and the associ
ated arguments. Use upper case for the option flags and
lower case for modifiers.
<I>grdfile</I>
Name of the 2-D grdfile to modify
</PRE>
<H2>OPTIONS</H2><PRE>
<B>-A</B> If necessary, adjust the file's <I>x</I><B>_</B><I>inc,</I> <I>y</I><B>_</B><I>inc</I> to be
compatible with its domain (or a new domain set
with <B>-R</B>). Older gridfiles (i.e., created prior to
GMT 3.1) often had excessive slop in' <I>x</I><B>_</B><I>inc,</I> <I>y</I><B>_</B><I>inc</I>
and an adjustment is necessary. Newer files are
created correctly.
<B>-D</B> Give new values for <I>xunit,</I> <I>yunit,</I> <I>zunit,</I> <I>scale,</I>
<I>offset,</I> <I>title,</I> and <I>remark</I>. To leave some of the
values untouched, specify = as the new value.
<B>-R</B> <I>west,</I> <I>east,</I> <I>south,</I> and <I>north</I> specify the Region of
interest. To specify boundaries in degrees and min
utes [and seconds], use the dd:mm[:ss] format.
Append <B>r</B> if lower left and upper right map coordi
nates are given instead of wesn. The new w/e/s/n
values will replace those in the grid, and the
<I>x</I><B>_</B><I>inc,</I> <I>y</I><B>_</B><I>inc</I> values are adjusted, if necessary.
<B>-S</B> For global, geographical grids only. Grid values
will be shifted laterally according to the new bor
ders given in <B>-R</B>.
<B>-V</B> Selects verbose mode, which will send progress
reports to stderr [Default runs "silently"].
</PRE>
<H2>EXAMPLES</H2><PRE>
Let us assume the file data.grd covers the area
300/310/10/30. We want to change the boundaries from
grdedit data.grd <B>-R</B>-60/-50/10/30 <B>-D</B>=/=/=/=/=/"Gravity
Anomalies"/=
The grid world.grd has the limits 0/360/-72/72. To shift
the data so that the limits would be -180/180/-72/72, use
grdedit world.grd <B>-R</B>-180/180/-72/72 <B>-S</B>
The file junk.grd was created prior to GMT 3.1 with incom
patible <B>-R</B> and <B>-I</B> arguments. To reset the x- and y-incre
ments we run
grdedit junk.grd <B>-A</B>
</PRE>
<H2>SEE ALSO</H2><PRE>
<I>gmt</I>(l), <I><A HREF="grd2xyz.html">grd2xyz</A></I>(l), <I><A HREF="xyz2grd.html">xyz2grd</A></I>(l)
</PRE>
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