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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I want to provide a geometry that was
input from Google Maps (SRID 3857) for GPS units (SRID 4326). How should I do
that?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I hated to post this, frankly. I know it’s
a “thinko;” I’m not understanding the concept. If I describe a geometry in SRID
3857, then it seems to me that that point would have a slightly different
description in SRID 4326. Instead, they’re wildly different. So, I know I am
misunderstanding in some basic way. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ron<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
postgis-users-bounces@postgis.refractions.net
[mailto:postgis-users-bounces@postgis.refractions.net] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Emilie Laffray<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, May 20, 2010 12:48
PM<br>
<b><span style='font-weight:bold'>To:</span></b> PostGIS Users Discussion<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [postgis-users] I
can't make sense of this.</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Why would
you expect them to be similar? There are different sets of coordinates.<br>
Your first set of coordinates looks like wgs84 but you set the srid to Google
srid. <br>
It doesn't make sense.<o:p></o:p></span></font></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>On 20 May 2010 17:38,
"Ronald Phillips" <<a href="mailto:rphillips@summitengineer.net">rphillips@summitengineer.net</a>>
wrote:<o:p></o:p></span></font></p>
<div link=blue vlink=purple>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>SELECT
</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>
ST_AsText(</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>
ST_GeomFromText('POINT(-81.064544 40.28787)', 3857)</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>
) </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>AS goog, </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>
ST_AsText(</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>
ST_Transform(</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>
ST_GeomFromText('POINT(-81.064544 40.28787)', 3857)</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>
, 4326)</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>
) </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>AS gcs</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>3857 is
“Google’s” SRID, and 4326 is a fairly standard GPS SRID. I’m getting this:</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Goog:
"POINT(-81.064544 40.28787)";</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Gcs:
"POINT(-0.000728215188753794 0.000361912093851508)"</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>What am I
doing wrong, that they’re so different?</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font><o:p></o:p></p>
<p><font size=3 face="Lucida Sans"><span style='font-size:12.0pt;font-family:
"Lucida Sans"'>Ronald Phillips, B.S., M.S.</span></font><o:p></o:p></p>
<p><font size=3 face="Lucida Sans"><span style='font-size:12.0pt;font-family:
"Lucida Sans"'>Programmer/Analyst</span></font><o:p></o:p></p>
<p><font size=1 face="Lucida Sans"><span style='font-size:8.0pt;font-family:
"Lucida Sans"'> </span></font><o:p></o:p></p>
<p><st1:City w:st="on"><font size=1 face="Lucida Sans"><span style='font-size:
8.0pt;font-family:"Lucida Sans"'>Summit</span></font></st1:City><font size=1
face="Lucida Sans"><span style='font-size:8.0pt;font-family:"Lucida Sans"'> <st1:place
w:st="on"><st1:PlaceType w:st="on">County</st1:PlaceType> <st1:PlaceName w:st="on">Engineer</st1:PlaceName></st1:place></span></font><o:p></o:p></p>
<p><st1:Street w:st="on"><st1:address w:st="on"><font size=1 face="Lucida Sans"><span
style='font-size:8.0pt;font-family:"Lucida Sans"'>538 E. South St</span></font></st1:address></st1:Street><font
size=1 face="Lucida Sans"><span style='font-size:8.0pt;font-family:"Lucida Sans"'>.</span></font><o:p></o:p></p>
<p><st1:place w:st="on"><st1:City w:st="on"><font size=1 face="Lucida Sans"><span
style='font-size:8.0pt;font-family:"Lucida Sans"'>Akron</span></font></st1:City><font
size=1 face="Lucida Sans"><span style='font-size:8.0pt;font-family:"Lucida Sans"'>
<st1:State w:st="on">OH</st1:State> <st1:PostalCode w:st="on">44311</st1:PostalCode></span></font></st1:place><o:p></o:p></p>
<p><font size=1 face="Lucida Sans"><span style='font-size:8.0pt;font-family:
"Lucida Sans"'>330.643.8061</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><a
name="128b694e7d91a3d1_webProfileURL"></a><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><a href="http://www.linkedin.com/in/rwphillips"
target="_blank" title="View public
profile">http://www.linkedin.com/in/rwphillips</a><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
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face="Times New Roman"><span style='font-size:12.0pt'><br>
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