[postgis-users] Are there script examples for determine where vertices run clockwise or anti-clockwise?

[Shaozhong SHI]

The problem now is that I can not find anything for lines.

Anything like ST_IsPolygonCW|ST_IsPolygonCCW for lines for instance,
something like ST_IsLineCW|ST_IsLineCCW.

Regards,

David

On Wed, 16 Feb 2022 at 19:43, Marcin Mionskowski <
mionskowskimarcin at gmail.com> wrote:

> Assuming simple polygons, composed from exterior ring only (i.e. no
> multipolygons), I think that you are looking for a function
> {ST_IsPolygonCW|ST_IsPolygonCCW}.
>
> Greetings,
> Marcin
>
> śr., 16 lut 2022 o 19:55 Imre Samu <pella.samu at gmail.com> napisał(a):
>
>> > how vertices run?  clockwise or anti-clockwise?
>>
>> maybe the:
>> https://postgis.net/docs/ST_Angle.html  *"Computes the clockwise angle
>> between two vectors."*
>> or https://postgis.net/docs/ST_Azimuth.html
>>
>> regards,
>>  Imre
>>
>>
>> Shaozhong SHI <shishaozhong at gmail.com> ezt írta (időpont: 2022. febr.
>> 16., Sze, 17:06):
>>
>>> Can we use PostGIS to find out how vertices run?  clockwise or
>>> anti-clockwise?
>>>
>>> Regards,
>>>
>>> David
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