[postgis-users] Spurious Results using ST_Split

[Rémi Cura]

Hey,
it looks like a classical precision issue.
There are some workaround but they are a little bit annoying.

Cheers,
Rémi-C


2014-05-23 13:46 GMT+02:00 Jeff Adams - NOAA Affiliate <jeff.adams at noaa.gov>
:

> Greetings,
>
> I have been working with the st_split function and have been receiving
> strange results. Specifically, I have been using a polygon geometry to
> split a linestring geometry. After the split I have been using st_within to
> identify which of the resulting split linestring geometries are inside and
> which are outside. Sometimes the st_within results are as expected, other
> times, split linestring geometries that are clearly within the polygon
> feature (they were created using the polygon as the blade) are not
> identified as so. When checking in ArcGIS, the features that returned false
> using the st_within function in PostGIS (but by the nature of how they were
> created should be within the polygon) are being identified by ArcGIS as
> being within the polygon. Does anybody know why PostGIS' st_within is
> returning false with these features? Any workarounds? I am performing this
> analysis on a fairly large dataset.
>
> Thanks in advance...
> Jeff
>
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