<span style="font-size: 11pt; font-family: Arial;">Hi all,<br>
I'm a fairly new user to grass and am trying to <span id="misp_compose_1">classify imagery using&nbsp; unsupervised and supervised
classification techniques, however I'm looking for some <span id="misp_compose_2">clarification in grouping imagery
using i.group.&nbsp; My basic understanding is that a group is a set of imagery
i.e <span id="misp_compose_3">RGB</span>, PAN, <span id="misp_compose_4">NIR</span> ... what then is the
subgroup?<br>
<br>
The data that I'm <span id="misp_compose_5">analyzing</span>
is <span id="misp_compose_6">digital</span> <span id="misp_compose_7">orthophoto</span> <span id="misp_compose_8">acquired</span> using <span id="misp_compose_9">vexcel</span>&nbsp; <span id="misp_compose_10">ultracam</span>
and has the following spectral resolution:<br>
<br>
PAN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 390-690nm<br>
BLUE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 390-470nm<br>
GREEN&nbsp;&nbsp; 420-580nm<br>
RED&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 620-690nm<br>
<span id="misp_compose_11">NIR</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
690-900nm<br clear="all">
<br>
<br>
Any information would be much <span id="misp_compose_12">appreciated<br>
<br>
Cheers</span></span></span></span><br><br>Toronto, Canada<br>------------------------------------------------------------<br>&quot;She knows there's no success like failure<br>And that failure's no success at all.&quot;<br>
-Bob Dylan-<br>------------------------------------------------------------