<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-2" http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
Witek,<br>
<br>
From: <a class="moz-txt-link-freetext" href="http://grads.iges.org/grads/gadoc/script.html#commands">http://grads.iges.org/grads/gadoc/script.html#commands</a><br>
<p><b><code><a
href="http://grads.iges.org/grads/gadoc/gradcomdquery.html">q</a> <i>transform
coord1 coord2</i></code></b> -- Coordinate transformations </p>
<ul>
<p>where <code><i>transform</i></code> is one of: <br>
<code>xy2w </code>XY coords to world coords <br>
<code>xy2gr </code>XY coords to grid coords <br>
<code>w2xy </code>world coords to XY coords <br>
<code>w2gr </code>world coords to grid coords <br>
<code>gr2w </code>grid coords to world coords <br>
<code>gr2xy </code>grid coords to XY coords <br>
</p>
</ul>
<p><i>XY coords</i> are inches on the page (screen) where the page is
11x8.5 inches or 8.5x11 inches, depending on how GrADS was started.
</p>
<p><i>World coords</i> are lat, lon, lev, time or val, depending on
what
the dimension environment is when the grid was displayed. Note that
time is displayed (and must be specified) in GrADS absolute date/time
format. val is the value coordinate for a 1-D plot (linegraph).
</p>
<p><i>Grid coordinates</i> are the i,j indices the grid being
displayed. For station data sets, grid and world coordinates are
equivalent except for the time dimension. Note that if you display a
grid from a 'wrapped' data set, the grid numbers may be out of range
of the actual file grid numbers. (A 'wrapped' data set is a data set
that covers the earth in the longitude direction. Wrapping takes place
automatically). The conversions are done consistently, but you may
want to be sure you can handle the wrapping case if your data set is
global.
</p>
<p>N.B. Coordinate transform queries are only valid after something has
been displayed, and the transformations apply only to the most recent
item that has been displayed.
</p>
<b><code><a name="scriptfindstn"></a><br>
<br>
</code></b><b><code></code></b>
<p>I hope this helps,<br>
Chuck<br>
</p>
Witold Interewicz wrote:
<blockquote cite="mid442ab91900ea5@wp.pl" type="cite">
<pre wrap="">Hello,
I'm trying to convert some geographical coordinates to virtual page coordinates.
Unfortunately command
'query gr2xy La Fi'
returns
'No scaling environment'
error message.
What is the proper way of use and context of calling for 'query gr2xy' command?
Greetings
Witek
----------------------------------------------------
Bezpieczeństwo dla wszystkich - gry i zabawy edukacyjne!
<a class="moz-txt-link-freetext" href="http://klik.wp.pl/?adr=http%3A%2F%2Fadv.reklama.wp.pl%2Fas%2Fdroga.html&sid=711">http://klik.wp.pl/?adr=http%3A%2F%2Fadv.reklama.wp.pl%2Fas%2Fdroga.html&sid=711</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
********************************************************************
Charles Seman <a class="moz-txt-link-abbreviated" href="mailto:charles.seman@noaa.gov">charles.seman@noaa.gov</a>
U.S. Department of Commerce / NOAA / OAR
Geophysical Fluid Dynamics Laboratory voice: (609) 452-6547
201 Forrestal Road fax: (609) 987-5063
Princeton, NJ 08540-6649 <a class="moz-txt-link-freetext" href="http://www.gfdl.noaa.gov/~cjs/">http://www.gfdl.noaa.gov/~cjs/</a>
********************************************************************
"The contents of this message are mine personally and do not reflect
any position of the Government or NOAA."
</pre>
</body>
</html>