[Proj] Error during the coordinate transformation?
Fernando Javier Luyo Zegarra
fluyoz at hotmail.com
Wed Apr 1 14:32:47 EST 2009
Hi
The code corresponds to Perú
Fernando
Date: Tue, 31 Mar 2009 16:17:29 -0500
From: cjmce at lsu.edu
To: proj at lists.maptools.org; proj at lists.maptools.org
Subject: Re: [Proj] Error during the coordinate transformation?
Dear Fernando:
What country is this, and what parameters did you use. I suspect you're in Venezuela ... please confirm.
Estan usted en la Republica de Venezuela? Esta verdad?
C. Mugnier
Louisiana State University
From: proj-bounces at lists.maptools.org on behalf of Fernando Javier Luyo Zegarra
Sent: Tue 31-Mar-09 16:11
To: proj at lists.maptools.org
Subject: [Proj] Error during the coordinate transformation
Hello,
I'm developed a routine for transforming coordinates of points which are in PSAD56 Zone 18S (srid = 24878) to Wgs84 Zone 18s (srid = 32718)
The items are stored in the fields "geom" the table "MyTable" (srid = 24878).
To perform the operation using the following syntax:
select Transform (geom, 32718) from MyTable
Reviewing the results found that there is an error:
Example:
Point in Psad56 Zn 18s
X = 264365.2955 Y = 8665287.3660 Z = 0.0000
The result of the transformation is:
X = 264366.1196 Y = 8665292.17 Z = 0.0000
However, the same point in cartografia WGS84 Zone 18S has the following coordinates:
X = 264143.0640 Y = 8664919.0231 Z = 0.0000
Apparently the SRID of the parameters are not properly used or applied incorrectly the function Transform ()
While waiting for your help
Fernando Luyo
pd: Sorry for my bad English
**************************************************
Hola
Estoy elaborando una rutina para transformar coordenadas de puntos que estan en PSAD56 Zona 18S (srid=24878) a Wgs84 Zona 18s (srid=32718)
Los puntos estan almacenados en el campo "geom" de la tabla "MyTable" (srid=24878).
Para realizar la operacion estoy usando la siguiente sintaxis:
select Transform(geom,32718) from MyTable
Al revisar los resultados encontre que hay un error :
Ejemplo :
Punto en Psad56 Zn 18s
X = 264365.2955 Y = 8665287.3660 Z = 0.0000
El resultado de la transformacion es:
X = 264366.1196 Y = 8665292.17 Z = 0.0000
Sin embargo, el mismo punto en cartografia en WGS84 Zona 18S tiene las siguientes coordenadas:
X = 264143.0640 Y = 8664919.0231 Z = 0.0000
Al parecer los parametros de los SRID usado no estan correctos o estoy aplicando mal la funcion Transform()
A la espera de su ayuda< br>
saludos
Fernando Luyo
**************************************************
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