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<br>Hi<br><div style="text-align: left;" id="result_box" dir="ltr">The code corresponds to Perú<br>Fernando<br></div><br><br><br><br><br><hr id="stopSpelling">Date: Tue, 31 Mar 2009 16:17:29 -0500<br>From: cjmce@lsu.edu<br>To: proj@lists.maptools.org; proj@lists.maptools.org<br>Subject: Re: [Proj] Error during the coordinate transformation?<br><br>
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<div dir="ltr"><font size="2" color="#000000" face="Times New Roman">Dear Fernando:</font></div>
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<div dir="ltr"><font face="Times New Roman">What country is this, and what parameters did you use. I suspect you're in Venezuela ... please confirm.</font></div>
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<div dir="ltr"><font face="Times New Roman">Estan usted en la Republica de Venezuela? Esta verdad?</font></div>
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<div dir="ltr"><font face="Times New Roman">C. Mugnier</font></div>
<div dir="ltr"><font face="Times New Roman">Louisiana State University</font></div></div>
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<font size="2" face="Tahoma"><b>From:</b> proj-bounces@lists.maptools.org on behalf of Fernando Javier Luyo Zegarra<br><b>Sent:</b> Tue 31-Mar-09 16:11<br><b>To:</b> proj@lists.maptools.org<br><b>Subject:</b> [Proj] Error during the coordinate transformation<br></font><br></div>
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<br>Hello,<br><br>I'm developed a routine for transforming coordinates of points which are in PSAD56 Zone 18S (srid = 24878) to Wgs84 Zone 18s (srid = 32718)<br><br>The items are stored in the fields "geom" the table "MyTable" (srid = 24878).<br><br>To perform the operation using the following syntax:<br><br><br> select Transform (geom, 32718) from MyTable<br><br><br>Reviewing the results found that there is an error:<br><br><br>Example:<br><br>Point in Psad56 Zn 18s<br><br> X = 264365.2955 Y = 8665287.3660 Z = 0.0000<br><br>The result of the transformation is:<br><br> X = 264366.1196 Y = 8665292.17 Z = 0.0000<br><br>However, the same point in cartografia WGS84 Zone 18S has the following coordinates:<br><br> X = 264143.0640 Y = 8664919.0231 Z = 0.0000<br><br>Apparently the SRID of the parameters are not properly used or applied incorrectly the function Transform ()<br><br>While waiting for your help<br><br><br>Fernando Luyo<br>pd: Sorry for my bad English<b><br>**************************************************<br><br>Hola<br><br>Estoy elaborando una rutina para transformar coordenadas de puntos que estan en PSAD56 Zona 18S (srid=24878) a Wgs84 Zona 18s (srid=32718)<br><br>Los puntos estan almacenados en el campo "geom" de la tabla "MyTable" (srid=24878).<br><br><br>Para realizar la operacion estoy usando la siguiente sintaxis:<br><br><br>select Transform(geom,32718) from MyTable<br><br>Al revisar los resultados encontre que hay un error :<br><br>Ejemplo : <br><br>Punto en Psad56 Zn 18s<br><br>X = 264365.2955 Y = 8665287.3660 Z = 0.0000<br><br>El resultado de la transformacion es: <br><br>X = 264366.1196 Y = 8665292.17 Z = 0.0000<br><br>Sin embargo, el mismo punto en cartografia en WGS84 Zona 18S tiene las siguientes coordenadas:<br><br>X = 264143.0640 Y = 8664919.0231 Z = 0.0000<br><br>Al parecer los parametros de los SRID usado no estan correctos o estoy aplicando mal la funcion Transform()<br><br>A la espera de su ayuda< br><br>saludos<br><br>Fernando Luyo<br><br>**************************************************<br><br><br><br>
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