[postgis-users] [Partially solved] Re: Upgrade from Postgis 1.5.1-5 to 2.3.1

Thu Jul 18 10:22:10 PDT 2019

Привет Darafei

Sorry for the delay. I pushed my pull request in order to suggest a
modification of the documentation, as we talked about previously.

You asked me :

- what is IGN  <== I putted a link in the text I proposed.

- why it produces invalid SRIDs <== I'm not expert of cartography and
cannot explain the technical reason why in old databases using french IGN
we have SRID out of range. It seems that French IGN had specific system
about 10 years ago. I putted in my pull request an example of an issue. As
I seemed to me, these SRID correspond mostly to french islands which are
far from France (but not only islands also few parts of France itself). The
warnings I had on my screen mentionned these ones for example : 310024140,
310642254, ..., 110600000, 110013000, 110013000, and many others.

- what do you lose by removing them <== I had no more problems when doing
my hard upgrade of my database :-)  As I could understand, the old SRIDs
which have been out of range correspond to new SRID which are inside the
right range ; it seems that the IGN cartography data are still there but
with another format :

*OLD database :* SELECT srtext FROM spatial_ref_sys where srid=*310423221*;
returns :
PROJCS["St Pierre et Miquelon 1950",GEOGCS["St Pierre et Miquelon 1950
",DATUM["St Pierre et Miquelon 1950",SPHEROID["Clarke
1866",6378206.4000,294.9786982000000,AUTHORITY["IGNF","ELG004"]],TOWGS84[-95.5930,573.7630,173.4420,-0.9602,1.2510,-1.3918,42.626500],AUTHORITY["IGNF","REG423"]],PRIMEM["Greenwich",0.000000000,AUTHORITY["IGNF","LGO01"]],UNIT["degree",0.01745329251994330],AXIS["Longitude",EAST],AXIS["Latitude",NORTH],AUTHORITY["IGNF","STPM50GEO"]],PROJECTION["Transverse_Mercator",AUTHORITY["IGNF","PRC0221"]],PARAMETER["semi_major",6378206.4000],PARAMETER["semi_minor",6356583.8000],PARAMETER["latitude_of_origin",0.000000000],PARAMETER["central_meridian",-57.000000000],PARAMETER["scale_factor",0.99960000],PARAMETER["false_easting",500000.000],PARAMETER["false_northing",0.000],UNIT["metre",1],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["IGNF","STPM50UTM21"]]

*New database after hard upgrade :* SELECT srtext FROM spatial_ref_sys
where srid=*911423*;
returns :
GEOCCS["St Pierre et Miquelon 1950",DATUM["St Pierre et Miquelon
1950",SPHEROID["Clarke
1866",6378206.4000,294.9786982000000,AUTHORITY["IGNF","ELG004"]],TOWGS84[-95.5930,573.7630,173.4420,-0.9602,1.2510,-1.3918,42.626500],AUTHORITY["IGNF","REG423"]],PRIMEM["Greenwich",0.000000000,AUTHORITY["IGNF","LGO01"]],UNIT["metre",1],AXIS["X",OTHER],AXIS["Y",EAST],AXIS["Z",NORTH],AUTHORITY["IGNF","STPM50"]]

Thank you for your attention,
with best regards,
Mikhael

Le sam. 10 nov. 2018 à 19:11, Darafei "Komяpa" Praliaskouski <me at komzpa.net>
a écrit :

> Привет,
>
> That chapter is part of PostGIS documentation which is part of PostGIS
> itself. You can edit here:
> https://github.com/postgis/postgis/blob/svn-trunk/doc/installation.xml
>
> (just push [Edit], do your changes and [Save] -> [New pull request]).
>
> Please also mention what is IGN and why it produces invalid SRIDs, and
> what do you lose by removing them. :)
>
> пт, 9 нояб. 2018 г. в 19:24, Michel Philippenko <michel.ing93 at gmail.com>:
>
>> Hello,
>> I have managed to avoid errors in relation with
>> spatial_ref_sys_srid_check and I asked the administrators of the website
>> postgis.net to add some information in this page :
>> https://postgis.net/docs/postgis_installation.html#hard_upgrade
>> in the chapter :
>> "Some custom records of spatial_ref_sys in dump file have an invalid SRID
>> value"
>>
>> Information to insert :
>> "Typically, if you use the french system IGN, you will have problems with
>> SRID values out of range. You need first to throw out completely the IGN
>> from the sql which is resulting from postgis_restore.pl. So, first run :
>> perl utils/postgis_restore.pl "/somepath/olddb.backup" > oldbb.sql
>> then
>> grep -v IGNF olddb.sql > olddb-without-IGN.sql
>> then create your newdb, activate the required Postgis extensions, and
>> insert properly the french system IGN with this script :
>>
>> https://raw.githubusercontent.com/Remi-C/IGN_spatial_ref_for_PostGIS/master/Put_IGN_SRS_into_Postgis.sql
>> then, to finish, run :
>> psql -h localhost -p 5432 -U postgres -d newdb -f olddb-without-IGN.sql
>> 2> errors.txt
>> "
>> Thank you very much for you attention,
>> With best regards,
>> Mikhael Philippenko.
>>
>> Le jeu. 8 nov. 2018 à 14:55, Michel Philippenko <michel.ing93 at gmail.com>
>> a écrit :
>>
>>> Hello,
>>> I'm new with Postgis.
>>> I'm upgrading a database from Postgis 1.5.1-5 to 2.3.1 following the
>>> instructions given on this web page :
>>> https://postgis.net/docs/postgis_installation.html#hard_upgrade.
>>> The errors below are displayed when importing my dump. Will my DB work
>>> well ? Should I fight more to have no errors at all ?
>>> Thank you for your help and your attention.
>>> With best regards,
>>> Mikhael.
>>>
>>> ERREUR:  la famille d'opérateur « btree_geography_ops » existe déjà pour
>>> la méthode d'accès « btree »
>>> ERREUR:  la famille d'opérateur « btree_geometry_ops » existe déjà pour
>>> la méthode d'accès « btree »
>>> ERREUR:  la famille d'opérateur « gist_geography_ops » existe déjà pour
>>> la méthode d'accès « gist »
>>> ERREUR:  la contrainte de vérification « spatial_ref_sys_srid_check »
>>> est rompue par une ligne
>>> ERREUR:  n'a pas pu créer l'index unique « spatial_ref_sys_pkey »
>>> DÉTAIL : La clé (srid)=(999954) est dupliquée.
>>>
>>> My translation in English :
>>> ERROR:  the operator family « btree_geography_ops » already exists for
>>> the access method « btree »
>>> ERROR:  the operator family « btree_geometry_ops »already exists for the
>>> access method « btree »
>>> ERROR:  the operator family « gist_geography_ops » already exists for
>>> the access method « gist »
>>> ERROR:  the constraint check « spatial_ref_sys_srid_check » is broken
>>> for one line
>>> ERROR:  could not create the uniq index « spatial_ref_sys_pkey »
>>> DETAIL : The key (srid)=(999954) is duplicated.
>>>
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>
> --
> Darafei Praliaskouski
> Support me: http://patreon.com/komzpa
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