Hello everyone,
I finally found out what was wrong, in PostGis 1.4 the EPSG 3763 srid
is ill defined or incomplete. Basically it is missing the
'towgs84=0,0,0' parameter, though in my understanding it isn't used
during a grids transformation. Please see the attached log.
This is bewildering. I
Hello everyone,
I have tried to sort this issue in several ways, checking the correct
projection settings, trying other installations of PostGis but the
problem remains: PostGis seems unable to use the proj files for the
grid transformation method.
Is this a bug that should be reported? How can
The problem is probably with the grid files and proj.4. Is there any way to
download the GSB files for testing?
You can test with cs2cs to see if the proj4 string works or not. For
example, with Canada's NTv2 grid file, I can test to see if I installed it
correctly:
cs2cs -v +proj=latlong
Hello again,
I have tested this procedure in another PostGIS 1.4 install on Debian.
The results are exactly the same as on Ubuntu.
Is there any way I can test the usage of grid files? Some sort of
standard test procedure?
Thank you,
Luís
2010/6/9 Luís de Sousa luis.a.de.so...@gmail.com:
Dear Frank,
Thank you for your message, please read my comments below:
A few suggestions:
* The +nadgrids= directive can include a full path if you want to be
certain that path issues are not coming into play.
I tried this first, the result is exactly the same.
* If you can ensure that
Hi,
just a note: we have no problem using the same grids in OS Windows. (tested
with Postgres 8.4 and Postgis 1.4 or 1.5)
HTH,
Fred.
2010/6/9 Luís de Sousa luis.a.de.so...@gmail.com
Dear Frank,
Thank you for your message, please read my comments below:
A few suggestions:
* The
Luís de Sousa wrote:
Before I go, I just want to make sure that in principle PostGis should
be able to use the grid files simply by the indication of its
location, no additional configurations needed. Is this correct?
Luís,
I believe it should work fine with no special configuration.
Best
Dear all,
I'm having the same results with the GISVM. It can provide an easy way
to reproduce this behaviour, here's how:
1. Download the latest GISVM from:
http://sourceforge.net/projects/gisvm/files/GISVM_Release_2/GISVM_Base_Release_2/gisvm2base_20100601.7z/download
2. Run it either with
2010/6/9 Luís de Sousa luis.a.de.so...@gmail.com:
template_postgis=# UPDATE spatial_ref_sys
template_postgis-# SET proj4text = '+proj=tmerc
+lat_0=39.66 +lon_0=1 +k=1 +x_0=0 +y_0=0 +ellps=intl
+pm=lisbon +units=m +no_defs +nadgrids=ptLX_e89.gsb'
template_postgis-# WHERE srid =
Hello everyone,
I'm trying to convert a series of spatial features from one SRS to
another within PostGIS. Both are local systems for continental
Portugal, for which a set of grid definition files have been made
available by the University of Oporto. I downloaded these grid files
and copied them
I would also be interested in the answer to this question. Currently I
export PostGIS data to shapefiles and use ogr2ogr to transform, if a grid
shift is required. Perhaps the solution to this problem could be documented
on the ST_Transform() page in the PostGIS manual?
Cheers,
Francis
Luís de Sousa wrote:
Hello everyone,
I'm trying to convert a series of spatial features from one SRS to
another within PostGIS. Both are local systems for continental
Portugal, for which a set of grid definition files have been made
available by the University of Oporto. I downloaded these grid
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