[postgis-users] could not find function "centroid" in file "/usr/lib/postgresql/postgis.dll"

[Chapman, Martin]

Rudolf,
 
This is a wild guess, but a centroid sounds like it could be a class/struct in the geos library.  And since PostGIS uses geos for it's geometric calculations it probably needs geos installed.  http://geos.refractions.net/
 
Martin
 
-----Original Message----- 
From: Rudolf Nottrott [mailto:rnott at alexandria.UCSB.edu] 
Sent: Sat 6/26/2004 8:57 AM 
To: PostGIS Users Discussion 
Cc: 
Subject: [postgis-users] could not find function "centroid" in file "/usr/lib/postgresql/postgis.dll"



	I installed PostGIS with PostgreSQL on Windows XP / Cygwin, after switching
	off proj4 and geos in the Makefile (USE_PROJ=0 and
	USE_GEOS=0).  I switched off proj4 and geos because I was getting PostGIS
	compilition errors without them installed, and I felt a bit daunted
	about  two more installs.
	
	WIth
	USE_PROJ=0 and USE_GEOS=0
	PostGIS  compiles and installes ok -- I just wanted to get the basic
	PostGIS going first.
	
	Unfortunatley, now when loading the postgis.sql definitions file
	psql    -d   drg_usgs   -f   postgis.sql
	I get an error
	
	could not find function "centroid" in file "/usr/lib/postgresql/postgis.dll"
	
	Any idea what that means, and what to do?
	
	Thanks,
	
	Rudolf
	
	P.S.  I thought that perhaps it relates to the uninstalled geos, so I
	downloaded and unpacked geos, but then found no installation instructions
	for it (only an empty README file).
	
	>Subject: RE: Using/Compiling PostGIS on WindowsXP/Cygwin for use with
	>PostgreSQL
	>Date: Fri, 25 Jun 2004 17:45:25 -0600
	>From: "Chapman, Martin" <MChapman at sanz.com>
	>To: "PostGIS Users Discussion" <postgis-users at postgis.refractions.net>
	>
	>That is correct, fortunately the builds for these projects are really
	>good and work on both linux and windows.  Just download them and follow
	>the build instructions.  It's easier than you might think.
	>
	>Martin
	>
	>-----Original Message-----
	>From: Rudolf Nottrott [mailto:rnott at alexandria.UCSB.edu]
	>Sent: Friday, June 25, 2004 5:25 PM
	>To: PostGIS Users Discussion
	>Subject: RE: [postgis-users] Using/Compiling PostGIS on WindowsXP/Cygwin
	>for use with PostgreSQL
	>
	>Are you saying that proj4 and geos are required to run
	>PostGIS with PostgreSQL on Windows/Cygwin?
	>
	>Are they also required to run PostGIS with PostgreSQL on other
	>platforms, in particular Linux?
	>
	>If so, that adds up to quite an installation chore, mostly because of
	>the potential errors that can occur.
	>I feel a bit daunted!
	>
	>Rudolf
	>
	>At 05:01 PM 6/25/2004 -0600, you wrote:
	> >You need to download and install proj4.  It's the projection library
	> >used by postgis to handle projecting lat/lons into x,y and the inverse.
	>
	> >The zip can be found at http://www.remotesensing.org:16080/proj/ .
	> >Follow the build instructions for windows using the vc compiler.  Let
	> >me know if you have problems.  You also need geos which can be found at
	>
	> >http://geos.refractions.net .
	> >
	> >Martin Chapman
	
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