Geografic-Information-System/raster/r.info/r.info.html

<h2>DESCRIPTION</h2>

<em>r.info</em> reports some basic information about a
user-specified raster map layer.  This map layer must exist
in the user's current mapset search path.  Information
about the map's boundaries, resolution, projection, data
type, category number, data base location and mapset, 
the timestamp and history are put into a table and written to standard
output. The types of information listed can also be found
in the <i>cats</i>, <i>cellhd</i>, and <i>hist</i>
directories under the mapset in which the named map is
stored.

<p>
The user can save the tabular output to a file 
by using the UNIX redirection mechanism (&gt;); for example, the user 
might save a report on the <em>soils</em> map layer in a file called 
<em>soil.rpt</em> by typing: 

<div class="code"><pre>
r.info map=soils &gt; soil.rpt
</pre></div> 

<h2>NOTES</h2>

On large maps, the total number of cells in the map may not be displayed 
with an accurate number. This is only cosmetic.

<p>
Some standards (ISO-C90) and compilers do not support the 'long long' type 
as a 64-bit type. In the case that GRASS was built with such a compiler, 
an accuracy message may be displayed in the output of <em>r.info</em> 
after Total Cells:

<p>
<h2>EXAMPLES</h2>

Below is a full report produced by <em>r.info</em> for the raster map 
<i>slope</i> in the Spearfish sample data base: 

<div class="code"><pre>
 +----------------------------------------------------------------------------+
 | Layer:    slope                          Date: Mon Nov  5 10:55:57 2001    |
 | Mapset:   PERMANENT                      Login of Creator: neteler         |
 | Location: spearfish60                                                      |
 | DataBase: /home/neteler/grassdaten                                         |
 | Title:    slope in degrees ( slope )                                       |
 | Timestamp: 20 Mar 1984 10:30 -0600 / 21 Mar 2020 10:30 -0600               |
 |----------------------------------------------------------------------------|
 |                                                                            |
 |   Type of Map:  raster               Number of Categories: 255             |
 |   Data Type:    FCELL                                                      |
 |   Rows:         477                                                        |
 |   Columns:      634                                                        |
 |   Total Cells:  302418                                                     |
 |        Projection: UTM (zone 13)                                           |
 |            N:    4928010    S:    4913700   Res:    30                     |
 |            E:     609000    W:     589980   Res:    30                     |
 |   Range of data:    min =  0.000000 max = 52.520164                        |
 |                                                                            |
 |   Data Source:                                                             |
 |    raster elevation file elevation.dem                                     |
 |                                                                            |
 |                                                                            |
 |   Data Description:                                                        |
 |    generated by r.slope.aspect                                             |
 |                                                                            |
 |   Comments:                                                                |
 |    slope map elev = elevation.dem                                          |
 |    zfactor = 1.00 format = degrees                                         |
 |    min_slp_allowed = 0.000000                                              |
 |                                                                            |
 +----------------------------------------------------------------------------+
</pre></div>

Alternatively, the output from <em>r.info</em> may be confined to a more terse
subset of the available information by passing various flags to the module:

<div class="code"><pre> 
GRASS> r.info -g slope
north=4928030
south=4913690
east=609000
west=589980
nsres=30
ewres=30
rows=477
cols=634
cells=302418
datatype=FCELL

GRASS> r.info -r slope
min=0.000000
max=52.520164

GRASS> r.info -e slope
title=slope in degrees (slope)
units="none"
vertical_datum="none"
timestamp="none"
</pre></div>


<h2>SEE ALSO</h2>

<em><a href="g.mapsets.html">g.mapsets</a>,</em>
<em><a href="r.coin.html">r.coin</a>,</em>
<em><a href="r.describe.html">r.describe</a>,</em>
<em><a href="r.report.html">r.report</a>,</em>
<em><a href="r.stats.html">r.stats</a>,</em>
<em><a href="r.support.html">r.support</a>,</em>
<em><a href="r.univar.html">r.univar</a>,</em>
<em><a href="r.what.html">r.what</a></em>


<h2>AUTHOR</h2>

Michael O'Shea, 
<a href="http://www.cecer.army.mil/">U.S. Army Construction Engineering Research Laboratory</a>

<p>
<i>Last changed: $Date$</i>