[postgis-users] ST_OffsetCurve

[Paul Ramsey]

No, there's no simple set of instructions, because there are multiple operating systems PostGIS runs on, and within those multiple operating systems there are multiple builds and packaging options. And that's not counting the many cloud and container options. I did not create this world, but I do live in it.

P

> On May 5, 2022, at 2:34 PM, Simon Greener <simon at spdba.com.au> wrote:
> 
> Thanks Paul.
> I assume there are a simple set of instructions on how to do this. Our IT Dept took 3 months to add PostGIS to an existing DB! So being able to provide them with the accompanying request will be key.
> Simon
> 
> 39 Cliff View Drive
> Allens Rivulet Tas 7150
> (W) 0418 396 391
> On 6 May 2022, at 04:44, Paul Ramsey <pramsey at cleverelephant.ca> wrote:
> Hi Simon,
> This is going to be one of those annoying "you should upgrade!" answers. You should upgrade! 
> In particular, the new offset curve in the latest GEOS (3.10+) does not have this behaviour.
> ATB,
> P
> 
>> On May 4, 2022, at 11:32 PM, Simon Greener <simon at spdba.com.au> wrote:
>> 
>> I have a simple linestring that when i put it into st_offsetcurve a segment goes missing.
>> 
>> It must be something simple that I can't see... Help.
>> 
>> select ST_GeomFromEWKT('SRID=28356;LINESTRING(500307.696019595 6976743.9186081,500308.071454138 6976743.93737982,500308.409115531 6976743.97994064,500309.18401595 6976743.94236971,500309.644736808 6976743.81057794,500310.659151902 6976743.82466703,500311.203930379 6976743.92798709,500311.603 6976743.93)') as geom
>> 
>> 
>> union all
>> 
>> 
>> select ST_OffsetCurve(ST_GeomFromEWKT('SRID=28356;LINESTRING(500307.696019595 6976743.9186081,500308.071454138 6976743.93737982,500308.409115531 6976743.97994064,500309.18401595 6976743.94236971,500309.644736808 6976743.81057794,500310.659151902 6976743.82466703,500311.203930379 6976743.92798709,500311.603 6976743.93)'),0.02) as g
>> 
>> 
>> Regards
>> Simon
>> 39 Cliff View Drive
>> Allens Rivulet Tas 7150
>> (W) 0418 396 391
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