<p>Would not there be isolines of the same signal strength? In that case there is no unique x,y for a given signal strength...</p>
<div class="gmail_quote">On 2011-06-21 9:54 PM, "Saka Royban" <<a href="mailto:sakaroyban@yahoo.com">sakaroyban@yahoo.com</a>> wrote:<br type="attribution">> 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 <br>> distance less RSS value.<br>> <br>> <br>> <br>> <br>> <br>> ________________________________<br>> From: Chris Hermansen <<a href="mailto:chris.hermansen@tecogroup.ca">chris.hermansen@tecogroup.ca</a>><br>
> To: PostGIS Users Discussion <<a href="mailto:postgis-users@postgis.refractions.net">postgis-users@postgis.refractions.net</a>><br>> Sent: Wed, June 22, 2011 8:35:05 AM<br>> Subject: Re: [postgis-users] Interpolation problem<br>
> <br>> <br>> What are the three measurements? Is it reasonable to assume that knowing three <br>> measurement values tells you the location ie is there a unique x,y for each <br>> triple of measurements?<br>
> On 2011-06-21 8:54 PM, "Saka Royban" <<a 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 <br>>>way <br>>><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>>><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>
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