<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">yes, of course.there is a unique x,y for each triple measurements. <br>This measurements are, in fact, Received Signal Strength so it means more distance less RSS value.<br><div><br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Chris Hermansen <chris.hermansen@tecogroup.ca><br><b><span style="font-weight: bold;">To:</span></b> PostGIS Users Discussion <postgis-users@postgis.refractions.net><br><b><span style="font-weight: bold;">Sent:</span></b> Wed, June 22, 2011 8:35:05 AM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [postgis-users] Interpolation
problem<br></font><br>
<meta http-equiv="x-dns-prefetch-control" content="off"><p>What are the three measurements? Is it reasonable to assume that knowing three measurement values tells you the location ie is there a unique x,y for each triple of measurements?</p>
<div class="gmail_quote">On 2011-06-21 8:54 PM, "Saka Royban" <<a rel="nofollow" ymailto="mailto:sakaroyban@yahoo.com" target="_blank" href="mailto:sakaroyban@yahoo.com">sakaroyban@yahoo.com</a>> wrote:<br>> Hi all<br>> I'm not sure whether this can be done completely via PostGIS or it needs some <br>
> programming. Anyway, at this step no problem with programming if Knowing the way <br>> <br>> and algorithm.<br>> I have point shapefile (arranged like a grid) and for each point there is 3 <br>> similar measurements (obtained via 3 transmitters) and, of course, x and y <br>
> coordinates. The problem is that when i have a new point with these 3 measures, <br>> How can i interpolate its coordinates and specify its location?<br>> Maybe helpful to say, this type of measurement is distance dependent but <br>
> unfortunately i don't know the exact formula.<br>> <br>> Any help would be appreciated.<br>> Best Regards<br></div>
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