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<title>GRDVIEW</title>
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<h1 align="center">GRDVIEW</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#OPTIONS">OPTIONS</a><br>
<a href="#GRID FILE FORMATS">GRID FILE FORMATS</a><br>
<a href="#EXAMPLES">EXAMPLES</a><br>
<a href="#REMARKS">REMARKS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">grdview −
Create 3-D perspective grayshaded/colored image or mesh from
a 2-D grid file</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>grdview</b>
<i>relief_file</i> <b>−J</b><i>parameters</i> [
<b>−B</b>[<b>p</b>|<b>s</b>]<i>parameters</i> ] [
<b>−C</b><i>cptfile</i> ] [
<b>−E</b><i>azim</i>/<i>elev</i>[<b>+w</b><i>lon</i>/<i>lat</i>[/<i>z</i>]][<b>+v</b><i>x0</i>/<i>y0</i>]
] [ <b>−G</b><i>drapefile</i> |
<b>−G</b><i>grd_r</i>,<i>grd_g</i>,<i>grd_b</i> ] [
<b>−I</b><i>intensfile</i> ] [
<b>−Jz</b>|<b>Z</b><i>parameters</i> ] [
<b>−K</b> ] [ <b>−L</b>[<i>flags</i>] ] [
<b>−N</b><i>level</i>[/<i>color</i>] ] [
<b>−O</b> ] [ <b>−P</b> ] [
<b>−Q</b><i>type</i>[<b>g</b>] ] [
<b>−R</b><i>west</i>/<i>east</i>/<i>south</i>/<i>north</i>[/<i>zmin</i>/<i>zmax</i>][<b>r</b>]
] [ <b>−S</b><i>smooth</i> ] [
<b>−T</b>[<b>s</b>][<b>o</b>[<i>pen</i>]] ] [
<b>−U</b>[<i>just</i>/<i>dx</i>/<i>dy</i>/][<b>c</b>|<i>label</i>]
] [ <b>−V</b> ] [ <b>−W</b><i>type/pen</i> ] [
<b>−X</b>[<b>a</b>|<b>c</b>|<b>r</b>][<i>x-shift</i>[<b>u</b>]]
] [
<b>−Y</b>[<b>a</b>|<b>c</b>|<b>r</b>][<i>y-shift</i>[<b>u</b>]]
] [ <b>−Z</b><i>zlevel</i> ] [
<b>−c</b><i>copies</i> ]</p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>grdview</b>
reads a 2-D grid file and produces a 3-D perspective plot by
drawing a mesh, painting a colored/grayshaded surface made
up of polygons, or by scanline conversion of these polygons
to a rasterimage. Options include draping a data set on top
of a surface, plotting of contours on top of the surface,
and apply artificial illumination based on intensities
provided in a separate grid file. <i><br>
relief_file</i></p>
<p style="margin-left:22%;">2-D gridded data set to be
imaged (the relief of the surface). (See GRID FILE FORMAT
below.)</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−J</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Selects the map projection. Scale is UNIT/degree,
1:xxxxx, or width in UNIT (upper case modifier). UNIT is cm,
inch, or m, depending on the <b><A HREF="gmtdefaults.html#MEASURE_UNIT">MEASURE_UNIT</A></b> setting in
.gmtdefaults4, but this can be overridden on the command
line by appending <b>c</b>, <b>i</b>, or <b>m</b> to the
scale/width value. When central meridian is optional,
default is center of longitude range on <b>−R</b>
option. Default standard parallel is the equator. For map
height, max dimension, or min dimension, append <b>h</b>,
<b>+</b>, or <b>-</b> to the width, respectively.</p></td></tr>
</table>
<p style="margin-left:22%;">More details can be found in
the <b><A HREF="psbasemap.html">psbasemap</A></b> man pages.</p>
<p style="margin-left:22%; margin-top: 1em"><b>CYLINDRICAL
PROJECTIONS:</b></p>
<p style="margin-left:22%; margin-top: 1em"><b>−Jc</b><i>lon0/lat0/scale</i>
(Cassini) <b><br>
−Jcyl_stere</b>/[<i>lon0/</i>[<i>lat0/</i>]]<i>scale</i>
(Cylindrical Stereographic) <b><br>
−Jj</b>[<i>lon0/</i>]<i>scale</i> (Miller) <b><br>
−Jm</b>[<i>lon0</i>/[<i>lat0/</i>]]<i>scale</i>
(Mercator) <b><br>
−Jm</b><i>lon0/lat0/scale</i> (Mercator - Give
meridian and standard parallel) <b><br>
−Jo</b>[<b>a</b>]<i>lon0/lat0/azimuth/scale</i>
(Oblique Mercator - point and azimuth) <b><br>
−Jo</b>[<b>b</b>]<i>lon0/lat0/lon1/lat1/scale</i>
(Oblique Mercator - two points) <b><br>
−Joc</b><i>lon0/lat0/lonp/latp/scale</i> (Oblique
Mercator - point and pole) <b><br>
−Jq</b>[<i>lon0/</i>[<i>lat0/</i>]]<i>scale</i>
(Cylindrical Equidistant) <b><br>
−Jt</b><i>lon0/</i>[<i>lat0/</i>]<i>scale</i> (TM -
Transverse Mercator) <b><br>
−Ju</b><i>zone/scale</i> (UTM - Universal Transverse
Mercator) <b><br>
−Jy</b>[<i>lon0/</i>[<i>lat0/</i>]]<i>scale</i>
(Cylindrical Equal-Area)</p>
<p style="margin-left:22%; margin-top: 1em"><b>CONIC
PROJECTIONS:</b></p>
<p style="margin-left:22%; margin-top: 1em"><b>−Jb</b><i>lon0/lat0/lat1/lat2/scale</i>
(Albers) <b><br>
−Jd</b><i>lon0/lat0/lat1/lat2/scale</i> (Conic
Equidistant) <b><br>
−Jl</b><i>lon0/lat0/lat1/lat2/scale</i> (Lambert Conic
Conformal) <b><br>
−Jpoly</b>/[<i>lon0/</i>[<i>lat0/</i>]]<i>scale</i>
((American) Polyconic)</p>
<p style="margin-left:22%; margin-top: 1em"><b>AZIMUTHAL
PROJECTIONS:</b></p>
<p style="margin-left:22%; margin-top: 1em"><b>−Ja</b><i>lon0/lat0</i>[<i>/horizon</i>]<i>/scale</i>
(Lambert Azimuthal Equal-Area) <b><br>
−Je</b><i>lon0/lat0</i>[<i>/horizon</i>]<i>/scale</i>
(Azimuthal Equidistant) <b><br>
−Jf</b><i>lon0/lat0</i>[<i>/horizon</i>]<i>/scale</i>
(Gnomonic) <b><br>
−Jg</b><i>lon0/lat0</i>[<i>/horizon</i>]<i>/scale</i>
(Orthographic) <b><br>
−Jg</b><i>lon0/lat0/altitude/azimuth/tilt/twist/Width/Height/scale</i>
(General Perspective). <b><br>
−Js</b><i>lon0/lat0</i>[<i>/horizon</i>]<i>/scale</i>
(General Stereographic)</p>
<p style="margin-left:22%; margin-top: 1em"><b>MISCELLANEOUS
PROJECTIONS:</b></p>
<p style="margin-left:22%; margin-top: 1em"><b>−Jh</b>[<i>lon0/</i>]<i>scale</i>
(Hammer) <b><br>
−Ji</b>[<i>lon0/</i>]<i>scale</i> (Sinusoidal) <b><br>
−Jkf</b>[<i>lon0/</i>]<i>scale</i> (Eckert IV) <b><br>
−Jk</b>[<b>s</b>][<i>lon0/</i>]<i>scale</i> (Eckert
VI) <b><br>
−Jn</b>[<i>lon0/</i>]<i>scale</i> (Robinson) <b><br>
−Jr</b>[<i>lon0/</i>]<i>scale</i> (Winkel Tripel)
<b><br>
−Jv</b>[<i>lon0/</i>]<i>scale</i> (Van der Grinten)
<b><br>
−Jw</b>[<i>lon0/</i>]<i>scale</i> (Mollweide)</p>
<p style="margin-left:22%; margin-top: 1em"><b>NON-GEOGRAPHICAL
PROJECTIONS:</b></p>
<p style="margin-left:22%; margin-top: 1em"><b>−Jp</b>[<b>a</b>]<i>scale</i>[<i>/origin</i>][<b>r</b>|<b>z</b>]
(Polar coordinates (theta,r)) <b><br>
−Jx</b><i>x-scale</i>[<b>d</b>|<b>l</b>|<b>p</b><i>pow</i>|<b>t</b>|<b>T</b>][<i>/y-scale</i>[<b>d</b>|<b>l</b>|<b>p</b><i>pow</i>|<b>t</b>|<b>T</b>]]
(Linear, log, and power scaling)</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em"><b>−Jz</b></p></td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em">Sets the vertical scaling (for
3-D maps). Same syntax as <b>−Jx</b>.</p></td></tr>
</table>
<h2>OPTIONS
<a name="OPTIONS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">No space
between the option flag and the associated arguments.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p style="margin-top: 1em"><b>−B</b></p></td>
<td width="4%"></td>
<td width="78%">
<p style="margin-top: 1em">Sets map boundary annotation and
tickmark intervals; see the <b><A HREF="psbasemap.html">psbasemap</A></b> man page for
all the details.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−C</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>name of the color palette file. Must be present if you
want (1) mesh plot with contours (<b>−Qm</b>), or (2)
shaded/colored perspective image (<b>−Qs</b> or
<b>−Qi</b>). For <b>−Qs</b>: You can specify
that you want to skip a z-slice by setting red = -; to use a
pattern give red =
<b>P|p</b><i>dpi/pattern</i>[:<b>F</b><i>r/g/b</i>[<b>B</b><i>r/g/b</i>]].</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−E</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Sets the viewpoint’s azimuth and elevation (for
perspective view) [180/90]. For frames used for animation,
you may want to append <b>+</b> to fix the center of your
data domain (or specify a particular world coordinate point
with <b>+w</b><i>lon0</i>/<i>lat</i>[/<i>z</i>]) which will
project to the center of your page size (or specify the
coordinates of the projected view point with
<b>+v</b><i>x0</i>/<i>y0).</i></p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−G</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Drape the image in <i>drapefile</i> on top of the relief
provided by <i>relief_file</i>. [Default is
<i>relief_file</i>]. Note that <b>−Jz</b> and
<b>−N</b> always refers to the <i>relief_file</i>. The
<i>drapefile</i> only provides the information pertaining to
colors, which is looked-up via the cpt file (see
<b>−C</b>). Alternatively, give three grid files
separated by commas. These files must contain the red,
green, and blue colors directly (in 0-255 range) and no cpt
file is needed. The <i>drapefile</i> may be of higher
resolution than the <i>relief_file</i>.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−I</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Gives the name of a grid file with intensities in the
(-1,+1) range. [Default is no illumination].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−K</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>More <i>PostScript</i> code will be appended later
[Default terminates the plot system].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−L</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Boundary condition <i>flags</i> may be <i>x</i> or
<i>y</i> or <i>xy</i> indicating data is periodic in range
of x or y or both, or <i>flags</i> may be <i>g</i>
indicating geographical conditions (x and y are lon and
lat). [Default uses "natural" conditions (second
partial derivative normal to edge is zero).] If no
<i>flags</i> are set, use bilinear rather than the default
bicubic resampling when draping is required.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−N</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Draws a plane at this z-level. If the optional
<i>color</i> is provided, the frontal facade between the
plane and the data perimeter is colored. See
<b>−Wf</b> for setting the pen used for the outline.
(See SPECIFYING COLOR below).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−O</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects Overlay plot mode [Default initializes a new
plot system].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−P</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects Portrait plotting mode [Default is Landscape,
see <b><A HREF="gmtdefaults.html">gmtdefaults</A></b> to change this].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−Q</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Select one of four settings: 1. Specify <b>m</b> for
mesh plot [Default], and optionally append /<i>color</i> for
a different mesh paint [white]. 2. Specify <b>s</b> for
surface plot, and optionally append <b>m</b> to have mesh
lines drawn on top of surface. 3. Specify <b>i</b> for image
plot, and optionally append the effective dpi resolution for
the rasterization [100]. 4. Specify <b>c</b>. Same as
<b>−Qi</b> but will make nodes with z = NaN
transparent, using the colormasking feature in
<i>PostScript</i> Level 3 (the PS device must support PS
Level 3). For any of these choices, you may force a
monochrome image by appending <b>g</b>. Colors are then
converted to shades of gray using the (television) YIQ
transformation.</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−R</b></p></td>
<td width="4%"></td>
<td width="78%">
<p><i>xmin</i>, <i>xmax</i>, <i>ymin</i>, and <i>ymax</i>
specify the Region of interest. For geographic regions,
these limits correspond to <i>west, east, south,</i> and
<i>north</i> and you may specify them in decimal degrees or
in [+-]dd:mm[:ss.xxx][W|E|S|N] format. Append <b>r</b> if
lower left and upper right map coordinates are given instead
of w/e/s/n. The two shorthands <b>−Rg</b> and
<b>−Rd</b> stand for global domain (0/360 and
-180/+180 in longitude respectively, with -90/+90 in
latitude). Alternatively, specify the name of an existing
grid file and the <b>−R</b> settings (and grid
spacing, if applicable) are copied from the grid. For
calendar time coordinates you may either give (a) relative
time (relative to the selected <b><A HREF="gmtdefaults.html#TIME_EPOCH">TIME_EPOCH</A></b> and in the
selected <b><A HREF="gmtdefaults.html#TIME_UNIT">TIME_UNIT</A></b>; append <b>t</b> to
<b>−JX</b>|<b>x</b>), or (b) absolute time of the form
[<i>date</i>]<b>T</b>[<i>clock</i>] (append <b>T</b> to
<b>−JX</b>|<b>x</b>). At least one of <i>date</i> and
<i>clock</i> must be present; the <b>T</b> is always
required. The <i>date</i> string must be of the form
[-]yyyy[-mm[-dd]] (Gregorian calendar) or yyyy[-Www[-d]]
(ISO week calendar), while the <i>clock</i> string must be
of the form hh:mm:ss[.xxx]. The use of delimiters and their
type and positions must be exactly as indicated (however,
input, output and plot formats are customizable; see
<b><A HREF="gmtdefaults.html">gmtdefaults</A></b>). This option may be used to indicate the
range used for the 3-D axes [Default is region given by the
<i>relief_file</i>]. You may ask for a larger <i>w/e/s/n</i>
region to have more room between the image and the axes. A
smaller region than specified in the <i>relief_file</i> will
result in a subset of the grid.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−S</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Smooth the contours before plotting (see
<b><A HREF="grdcontour.html">grdcontour</A></b>) [Default is no smoothing].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−T</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Plot image without any interpolation. This involves
converting each node-centered bin into a polygon which is
then painted separately. Append <b>s</b> to skip nodes with
z = NaN. This option is useful for categorical data where
interpolating between values is meaningless. Optionally,
append <b>o</b> to draw the tile outlines, and specify a
custom pen if the default pen is not to your liking. As this
option produces a flat surface it cannot be combined with
<b>−JZ</b> or <b>−Jz</b>. (See SPECIFYING PENS
below).</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−U</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Draw Unix System time stamp on plot. By adding
<i>just/dx/dy/</i>, the user may specify the justification
of the stamp and where the stamp should fall on the page
relative to lower left corner of the plot. For example,
BL/0/0 will align the lower left corner of the time stamp
with the lower left corner of the plot. Optionally, append a
<i>label</i>, or <b>c</b> (which will plot the command
string.). The <b><A HREF="GMT.html">GMT</A></b> parameters <b><A HREF="gmtdefaults.html#UNIX_TIME">UNIX_TIME</A></b>,
<b><A HREF="gmtdefaults.html#UNIX_TIME_POS">UNIX_TIME_POS</A></b>, and <b><A HREF="gmtdefaults.html#UNIX_TIME_FORMAT">UNIX_TIME_FORMAT</A></b> can affect
the appearance; see the <b><A HREF="gmtdefaults.html">gmtdefaults</A></b> man page for
details. The time string will be in the locale set by the
environment variable <b>TZ</b> (generally local time).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−V</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects verbose mode, which will send progress reports
to stderr [Default runs "silently"].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−Wc</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Draw contour lines on top of surface or mesh (not
image). Append pen attributes used for the contours.
[Default: width = 0.75p, color = black, texture = solid].
(See SPECIFYING PENS below).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−Wm</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Sets the pen attributes used for the mesh. [Default:
width = 0.25p, color = black, texture = solid]. You must
also select <b>−Qm</b> or <b>−Qsm</b> for
meshlines to be drawn.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−Wf</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Sets the pen attributes used for the facade. [Default:
width = 0.25p, color = black, texture = solid]. You must
also select <b>−N</b> for the facade outline to be
drawn. (See SPECIFYING PENS below).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−X −Y</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Shift plot origin relative to the current origin by
(<i>x-shift,y-shift</i>) and optionally append the length
unit (<b>c</b>, <b>i</b>, <b>m</b>, <b>p</b>). You can
prepend <b>a</b> to shift the origin back to the original
position after plotting, or prepend <b>r</b> [Default] to
reset the current origin to the new location. If
<b>−O</b> is used then the default
(<i>x-shift,y-shift</i>) is (0,0), otherwise it is (r1i,
r1i) or (r2.5c, r2.5c). Alternatively, give <b>c</b> to
align the center coordinate (x or y) of the plot with the
center of the page based on current page size.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−Z</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Sets the z-level of the basemap [Default is the bottom
of the z-axis].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−c</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Specifies the number of plot copies. [Default is 1].</p></td></tr>
</table>
<p style="margin-left:11%; margin-top: 1em"><b>SPECIFYING
PENS</b></p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em"><i>pen</i></p></td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em">The attributes of lines and
symbol outlines as defined by <i>pen</i> is a comma
delimetered list of <i>width</i>, <i>color</i> and
<i>texture</i>, each of which is optional. <i>width</i> can
be indicated as a measure (points, centimeters, inches) or
as <b>faint</b>, <b>thin</b>[<b>ner</b>|<b>nest</b>],
<b>thick</b>[<b>er</b>|<b>est</b>],
<b>fat</b>[<b>ter</b>|<b>test</b>], or <b>obese</b>.
<i>color</i> specifies a gray shade or color (see SPECIFYING
COLOR below). <i>texture</i> is a combination of dashes
‘-’ and dots ‘.’.</p></td></tr>
</table>
<p style="margin-left:11%; margin-top: 1em"><b>SPECIFYING
COLOR</b></p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p style="margin-top: 1em"><i>color</i></p></td>
<td width="4%"></td>
<td width="78%">
<p style="margin-top: 1em">The <i>color</i> of lines, areas
and patterns can be specified by a valid color name; by a
gray shade (in the range 0−255); by a decimal color
code (r/g/b, each in range 0−255; h-s-v, ranges
0−360, 0−1, 0−1; or c/m/y/k, each in range
0−1); or by a hexadecimal color code (#rrggbb, as used
in HTML). See the <b><A HREF="gmtcolors.html">gmtcolors</A></b> manpage for more
information and a full list of color names.</p></td></tr>
</table>
<h2>GRID FILE FORMATS
<a name="GRID FILE FORMATS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b><A HREF="GMT.html">GMT</A></b> is
able to recognize many of the commonly used grid file
formats, as well as the precision, scale and offset of the
values contained in the grid file. When <b><A HREF="GMT.html">GMT</A></b> needs a
little help with that, you can add the suffix
<b>=</b><i>id</i>[<b>/</b><i>scale</i><b>/</b><i>offset</i>[<b>/</b><i>nan</i>]],
where <i>id</i> is a two-letter identifier of the grid type
and precision, and <i>scale</i> and <i>offset</i> are
optional scale factor and offset to be applied to all grid
values, and <i>nan</i> is the value used to indicate missing
data. See <b><A HREF="grdreformat.html">grdreformat</A></b>(1) and Section 4.17 of the GMT
Technical Reference and Cookbook for more information.</p>
<p style="margin-left:11%; margin-top: 1em">When reading a
netCDF file that contains multiple grids, <b><A HREF="GMT.html">GMT</A></b> will
read, by default, the first 2-dimensional grid that can find
in that file. To coax <b><A HREF="GMT.html">GMT</A></b> into reading another
multi-dimensional variable in the grid file, append
<b>?</b><i>varname</i> to the file name, where
<i>varname</i> is the name of the variable. Note that you
may need to escape the special meaning of <b>?</b> in your
shell program by putting a backslash in front of it, or by
placing the filename and suffix between quotes or double
quotes. See <b><A HREF="grdreformat.html">grdreformat</A></b>(1) and Section 4.18 of the
GMT Technical Reference and Cookbook for more information,
particularly on how to read splices of 3-, 4-, or
5-dimensional grids.</p>
<h2>EXAMPLES
<a name="EXAMPLES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">To make a mesh
plot from the file hawaii_grav.grd and drawing the contours
given in the color palette file hawaii.cpt on a Lambert map
at 1.5 cm/degree along the standard parallels 18 and 24,
with vertical scale 20 mgal/cm, and looking at the surface
from SW at 30 degree elevation, run</p>
<p style="margin-left:11%; margin-top: 1em"><b>grdview</b>
hawaii_grav.grd <b>−Jl</b> 18/24/1.5<b>c −C</b>
hawaii.cpt <b>−Jz</b> 0.05<b>c −Qm
−N</b>-100 <b>−E</b> 225/30 <b>−Wc</b>
> hawaii_grav_image.ps</p>
<p style="margin-left:11%; margin-top: 1em">To create a
illuminated color perspective plot of the gridded data set
image.grd, using the color palette file color.rgb, with
linear scaling at 10 cm/x-unit and tickmarks every 5 units,
with intensities provided by the file intens.grd, and
looking from the SE, use</p>
<p style="margin-left:11%; margin-top: 1em"><b>grdview</b>
image.grd <b>−Jx</b> 10.0<b>c −C</b> color.rgb
<b>−Qs −E</b> 135/30 <b>−I</b> intens.grd
> image3D.ps</p>
<p style="margin-left:11%; margin-top: 1em">To make the
same plot using the rastering option with dpi = 50, use</p>
<p style="margin-left:11%; margin-top: 1em"><b>grdview</b>
image.grd <b>−Jx</b> 10.0<b>c −C</b> color.rgb
<b>−Qi</b> 50 <b>−E</b> 135/30 <b>−I</b>
intens.grd > image3D.ps</p>
<p style="margin-left:11%; margin-top: 1em">To create a
color <i>PostScript</i> perspective plot of the gridded data
set magnetics.grd, using the color palette file
mag_intens.cpt, draped over the relief given by the file
topography.grd, with Mercator map width of 6 inch and
tickmarks every 1 degree, with intensities provided by the
file topo_intens.grd, and looking from the SE, run</p>
<p style="margin-left:11%; margin-top: 1em"><b>grdview</b>
topography.grd <b>−JM</b> 6<b>i −G</b>
magnetics.grd <b>−C</b> mag_intens.cpt <b>−Qs
−E</b> 140/30 <b>−I</b> topo_intens.grd >
draped3D.ps</p>
<p style="margin-left:11%; margin-top: 1em">Given topo.grd
and the Landsat image veggies.ras, first run <b><A HREF="gmt2rgb.html">gmt2rgb</A></b>
to get the red, green, and blue grids, and then drape this
image over the topography and shade the result for good
measure. The commands are</p>
<p style="margin-left:11%; margin-top: 1em"><b><A HREF="gmt2rgb.html">gmt2rgb</A></b>
veggies.ras <b>−G</b> layer_%c.grd <b><br>
grdview</b> topo.grd <b>−JM</b> 6<b>i −Qi
−E</b> 140/30 <b>−I</b> topo_intens.grd
<b>−G</b> layer_r.grd,layer_g.grd,layer_b.grd >
image.ps</p>
<h2>REMARKS
<a name="REMARKS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">For the
<b>−Qs</b> option: <i>PostScript</i> provides no way
of smoothly varying colors within a polygon, so colors can
only vary from polygon to polygon. To obtain smooth images
this way you may resample the grid file(s) using
<b><A HREF="grdsample.html">grdsample</A></b> or use a finer grid size when running
gridding programs like <b><A HREF="surface.html">surface</A></b> or
<b><A HREF="nearneighbor.html">nearneighbor</A></b>. Unfortunately, this produces huge
<i>PostScript</i> files. The alternative is to use the
<b>−Qi</b> option, which computes bilinear or bicubic
continuous color variations within polygons by using
scanline conversion to image the polygons.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><i><A HREF="GMT.html">GMT</A></i>(1),
<i><A HREF="gmt2rgb.html">gmt2rgb</A></i>(1), <i><A HREF="gmtcolors.html">gmtcolors</A></i>(5),
<i><A HREF="grdcontour.html">grdcontour</A></i>(1), <i><A HREF="grdimage.html">grdimage</A></i>(1),
<i><A HREF="nearneighbor.html">nearneighbor</A></i>(1), <i><A HREF="psbasemap.html">psbasemap</A></i>(1),
<i><A HREF="pscontour.html">pscontour</A></i>(1), <i><A HREF="pstext.html">pstext</A></i>(1), <i><A HREF="surface.html">surface</A></i>(1)</p>
<hr>
</body>
</html>
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