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You need to vary the size of the processing window ("size" argument). A tiny window will identify tiny features (e.g. peaks within a 3x3 cell window); a big window will find very large features.
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<div>Michael<br>
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____________________</div>
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<font face="Helvetica" size="3">C. Michael Barton</font></div>
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<font face="Helvetica" size="3">Director, Center for Social Dynamics & Complexity </font></div>
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<font face="Helvetica" size="3">Professor of Anthropology, School of Human Evolution & Social Change</font></div>
<div><font face="Helvetica" size="3">Head, Graduate Faculty in Complex Adaptive Systems Science</font></div>
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<font face="Helvetica" size="3">Arizona State University</font></div>
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<font face="Helvetica" size="3"><font>voice: </font><font>480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)</font><br>
<font>fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC)</font><br>
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<font face="Helvetica" size="3">www: <a href="http://www.public.asu.edu/~cmbarton">
http://www.public.asu.edu/~cmbarton</a>, <a href="http://csdc.asu.edu">http://csdc.asu.edu</a></font></div>
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<div>On Apr 16, 2014, at 12:00 PM, <<a href="mailto:grass-user-request@lists.osgeo.org">grass-user-request@lists.osgeo.org</a>> <<a href="mailto:grass-user-request@lists.osgeo.org">grass-user-request@lists.osgeo.org</a>> wrote:</div>
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<span style="font-family: Helvetica; color: rgb(127, 127, 127);"><b>From:<span class="Apple-converted-space"> </span></b></span><span style="font-family: Helvetica;">Patrick S. <<a href="mailto:patrick_GIS@gmx.ch">patrick_GIS@gmx.ch</a>><br>
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<span style="font-family: Helvetica; color: rgb(127, 127, 127);"><b>Subject:<span class="Apple-converted-space"> </span></b></span><span style="font-family: Helvetica;"><b>[GRASS-user] r.param.scale->high plane as peaks?</b><br>
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<span style="font-family: Helvetica; color: rgb(127, 127, 127);"><b>Date:<span class="Apple-converted-space"> </span></b></span><span style="font-family: Helvetica;">April 15, 2014 at 11:38:12 PM MST<br>
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<span style="font-family: Helvetica; color: rgb(127, 127, 127);"><b>To:<span class="Apple-converted-space"> </span></b></span><span style="font-family: Helvetica;">grass mailing list <<a href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a>><br>
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<br style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
<span style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">Dear
List,</span><br style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
<br style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
<span style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">In
my test of r.param.scale on GRASS64 peaks are evaluated on basis of single cells and do not form areas. High plains, i.e. neighboring "peaks" with the same value get ignored, while the example picture shows such areas<span class="Apple-converted-space"> </span></span><a href="http://grass.osgeo.org/grass65/manuals/r.param.scale.html" style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">http://grass.osgeo.org/grass65/manuals/r.param.scale.html</a><span style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;"><span class="Apple-converted-space"> </span>(only
for GRASS65?).</span><br style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
<span style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">What
would be the best way to find such grid cells and define peak-areas when needed?</span><br style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
<br style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
<span style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">Thank
you for your feedback,</span><br style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
<span style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;">Patrick</span><br style="font-family: BitstreamVeraSerif-Roman; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
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