<html><body><div style="color:#000; background-color:#fff; font-family:Courier New, courier, monaco, monospace, sans-serif;font-size:12pt"><div style="" class=""><span>The place where a point will fall depends on the arguments "distribution" and "parameters". In spatial simulated annealing we start allowing a point to be shifted (perturbed) to any location within the study area. As the iterations go on, we constrain the amount of shifting to shorter distances.</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;" class=""><br><span></span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;" class=""><span>Regarding v.random: could you please include a description in the help page on how the restriction is done? This is
an extremely important information.<br style=""></span></div><div style="" class=""> </div><div style="" class="">Alessandro Samuel-Rosa
<br style="" class="">---
<br style="" class="">Graduate School in Agronomy - Soil Science
<br style="" class="">Federal Rural University of Rio de Janeiro
<br style="" class="">Seropédica, Rio de Janeiro, Brazil
<br style="" class="">---
<br style="" class="">Guest Researcher at ISRIC - World Soil Information
<br style="" class="">Wageningen, the Netherlands
<br style="" class="">---
<br style="" class="">Homepage: soil-scientist.net Skype: alessandrosamuel</div> <div class="qtdSeparateBR"><br><br></div><div style="display: block;" class="yahoo_quoted"> <div class="" style="font-family: Courier New, courier, monaco, monospace, sans-serif; font-size: 12pt;"> <div class="" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div style="" class="" dir="ltr"> <font style="" class="" face="Arial" size="2"> Em Quinta-feira, 28 de Agosto de 2014 17:28, Markus Neteler <neteler@osgeo.org> escreveu:<br style="" class=""> </font> </div> <br style="" class=""><br style="" class=""> <div style="" class=""><div style="" class="" id="yiv2407734681"><div style="" class=""><div style="" class=""><br style="" class="" clear="none">
On Aug 27, 2014 12:12 AM, "Alessandro Samuel Rosa" <<a style="" class="" rel="nofollow" shape="rect" ymailto="mailto:alessandrosamuel@yahoo.com.br" target="_blank" href="mailto:alessandrosamuel@yahoo.com.br">alessandrosamuel@yahoo.com.br</a>> wrote:<br style="" class="" clear="none">
><br style="" class="" clear="none">
> Dear GRASS GIS developers,<br style="" class="" clear="none">
><br style="" class="" clear="none">
> I am planning to use v.perturb to run a spatial simulated annealing exercise. Two drawbacks with v.perturb exist. First, "output vector points are not guaranteed to be contained within the current geographic region".</div>
<div style="" class="">The command v.random got recently improved to optionally constrain points being generated to a restricted area. Not sure if this method could be implemented here as well.<br style="" class="" clear="none">
Did you test how far outside points may fall?</div>
<div style="" class="">> Second, all vector points are perturbed together.</div>
<div style="" class="">Here a "where" statement would help, to be implemented...</div>
<div style="" class="">Markus</div>
<div style="" class="" id="yiv2407734681yqtfd06950">> Is it very difficult to solve this issues?<br style="" class="" clear="none">
><br style="" class="" clear="none">
> Another option for perturbation would be v.edit, but in that case the direction and distance are not random.<br style="" class="" clear="none">
><br style="" class="" clear="none">
> Best,<br style="" class="" clear="none">
> <br style="" class="" clear="none">
> Alessandro Samuel-Rosa <br style="" class="" clear="none">
> --- <br style="" class="" clear="none">
> Graduate School in Agronomy - Soil Science <br style="" class="" clear="none">
> Federal Rural University of Rio de Janeiro <br style="" class="" clear="none">
> Seropédica, Rio de Janeiro, Brazil <br style="" class="" clear="none">
> --- <br style="" class="" clear="none">
> Guest Researcher at ISRIC - World Soil Information <br style="" class="" clear="none">
> Wageningen, the Netherlands <br style="" class="" clear="none">
> --- <br style="" class="" clear="none">
> Homepage: <a style="" class="" rel="nofollow" shape="rect" target="_blank" href="http://soil-scientist.net/">soil-scientist.net</a> Skype: alessandrosamuel</div><br style="" class="" clear="none">
><br style="" class="" clear="none">
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