1

I have used this PostGIS in different environments many times without issue:

update my_table set geom = ST_MakeValid(geom) where ST_IsValid(geom) = false;

However in Azure I keep seeing the following response:

ERROR:  GEOS isvalid() threw an error!

This is using PostGIS 2.3.2 r15302 and GEOS 3.6.1-CAPI-1.10.1 r4317

In case it was because geom was null I tried the following:

update my_table set geom = ST_MakeValid(geom) 
where geom is not null and ST_IsValid(geom) = false;

However I get the same error.

The above was in psql. I tried DBeaver as well (I have given up on PgAdmin4) and there I see the following slightly different output:

SQL Error [XX000]: ERROR: GEOS isvalid() threw an error!

Googling GEOS threw an error seems to point to invalid geometries and suggests the user use ST_IsValid() but in this case that is the function causing the issue.

How do I fix the issue when ST_IsValid() itself throws an error?

Update:

Through searching through hundreds of thousands of entries in the table, I found two with errors.

If I try

update my_table set geom = ST_MakeValid(geom) where id in (1234, 5678)

then I see the following error

ERROR: GEOSisValid(): IllegalArgumentException: Exponent out of bounds

How do I fix either error?

migrated from stackoverflow.com Mar 16 at 4:26

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  • could you post the WKB geometries of those two entries? – ThingumaBob Mar 16 at 11:28
  • And the OS version? Lots of people run Linux on Azure. – John Powell Mar 17 at 8:48
  • @ThingumaBob: This is one of them: SRID=4326;MULTIPOLYGON(((6.625539714341757E10 2.121995794E-314,-79.4405401677212 -8.483985467320476E12,4.2439915834E-314 8.487983176E-314,6.625539714341757E10 2.121995794E-314)),((-79.44054016772121 43.709715347456374,-79.4405401677212 43.70971534745637,-79.44054016772121 43.70971534745637,-79.44054016772121 43.709715347456374))) – Ask613 Mar 17 at 12:05
  • @JohnPowell It is a managed instance of PostgreSQL in Azure so I do not know the OS version. – Ask613 Mar 17 at 12:07
3

I am still not sure how/why the geometry has an issue, or why the GEOS functions are throwing errors, but I figured out how to clean up the bad data.

Given that both ST_IsValid() and ST_MakeValid() did not work, I cleaned the geometry as follows:

  • Convert it to GeoJSON with ST_AsGeoJSON()
  • Convert it back to a geometry with ST_GeomFromGeoJSON()
  • At this point it is still invalid, but ST_IsValid() works
  • Because it is invalid use ST_MakeValid()
  • Set the SRID back to the desired one with ST_SetSRID()

Which results in

update my_table 
set geom = ST_SetSRID(ST_MakeValid(ST_GeomFromGeoJSON(ST_AsGeoJSON(geom))), 4326)
where id in (1234, 5678)

The resulting geometry is valid.

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