[postgis-users] Error: "Precision reduction requires GEOS-3.9 or higher"

[Paul Ramsey]

It's curious, but the implication is that the postgis on your machine was built against an earlier GEOS. The version number that postgis reports for GEOS is generated at run-time, while the test of whether to include support for various functions is determined at compile-time. Hence you can see a "GEOS 3.9" version in your postgis, but still not have access to functions that are 3.9+ only.

P

> On Apr 16, 2021, at 2:53 PM, Marco Boeringa <marco at boeringa.demon.nl> wrote:
> 
> Hi all,
> 
> I upgraded my Ubuntu 20.04 instance with "libgeos-3.9.0" from the ubuntugis repository.
> 
> When I use:
> 
> "SELECT PostGIS_Full_Version();"
> 
> I get back:
> 
> POSTGIS="3.1.1 aaf4c79" [EXTENSION] PGSQL="130" GEOS="3.9.0-CAPI-1.16.2" PROJ="6.3.1" LIBXML="2.9.10" LIBJSON="0.13.1" LIBPROTOBUF="1.3.3" WAGYU="0.5.0 (Internal)"
> 
> which at least suggests I am now correctly using GEOS 3.9.0 (note: I updated the PostGIS extension's functions using "ALTER EXTENSION postgis UPDATE")
> 
> However, after adjusting some existing code to include the new "ST_ReducePrecision" PostGIS function (https://postgis.net/docs/ST_ReducePrecision.html), which is new in 3.9.0, I get back an error:
> 
> "Precision reduction requires GEOS-3.9 or higher"
> 
> which seems weird given the "PostGIS_Full_Version" result. Anyone have a clue as to what I missed?
> 
> Marco
> 
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