[postgis-users] Custom st_simplify function

Alexander Gataric gataric at usa.net
Sat Feb 15 11:24:38 PST 2020


I tried to use st_segmentize but found that the m coordinate gets corrupted.

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On Feb 15, 2020, 12:50 PM, at 12:50 PM, Phil Bartie <philbartie at gmail.com> wrote:
>Would ST_Segmentize() do what you are after?
> Run it after the simplify.
>
>https://postgis.net/docs/ST_Segmentize
>
>Might need to use in conjunction with ST_Union()
>
>
>
>
>
>On Sat, 15 Feb 2020 at 18:44, Alexander Gataric <gataric at usa.net>
>wrote:
>
>> I mean if a line is one mile long and is simplified into five 1000
>foot
>> segments, I want the longest segment to be 500 feet instead of 1000
>feet.
>>
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>> On Feb 15, 2020, at 11:47 AM, Martin Davis <mtnclimb at gmail.com>
>wrote:
>>>
>>> You mean you want to keep simplifying until there are no segments of
>>> length greater than the maximum?  (Presumably excluding input
>segments
>>> already longer?)
>>>
>>> On Fri, Feb 14, 2020, 1:57 PM Alexander Gataric <gataric at usa.net>
>wrote:
>>>
>>>> Is there a way to modify st_simplify to have a maximum segment
>length? I
>>>> want to be able to limit it to 500 feet.
>>>>
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