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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am using postgis 1.4 and following the instructions in
PostGis in Action, I am trying to use real coordinates data (longitude and
latitude) that they fetched from a google android mobile device to construct a
polygon (I am going to use it as a query box).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Particularly, the loaded coordinates (lon,lat), which are
translated as mobile user absolute position will be used as the origin of a
circle, having as radius the positional_accuracy of gps device in meters.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>So, having the user position in decimal degrees, the radius
of a circle in meters, the yaw angle of mobile device embeded compass showing
the direction of the user, I want to construct a geometry polygon. Namely, I
want to find the four point cartesian coordinates of the polygon. I have some
formulas but I cant get true results. I tried transforming WGS84 (EPSG:4326
coordinate reference system of lon lat coordinates) to a planar reference
system as Tranverse UTM EPSG:32636 but till now I did not find the solution.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>It seems that transformations create a huge polygon.
Normally, I must create a polygon that depends from the distance between user
position and a real world object that the user is observing. Increasing that
distance the query window (polygon) must increase too.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If anyone can help I will really appreciate becuase I am
stuck here and I have to deliver very soon my master of thesis LBS & GIS application.
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank u very much.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Miltos Miltiadous<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Postgraduating Information Systmes student in Open
University <st1:place w:st="on"><st1:country-region w:st="on">Cyprus</st1:country-region></st1:place>.
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <o:p></o:p></span></font></p>
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