[postgis-devel] 2.5D TIN Operations

[Paul Ramsey]

Question that comes to mind: how big are these TINs of which you speak?

I mean, we have a TIN object now, but as with POLYGON and LINESTRING, the expectation is that the TIN fits in-memory. Which means the API is pretty simple, no? Just ST_Something(TIN) returns POLYGON. ST_Union(TIN, TIN) returns TIN? I mean, write out your list of functions, and what they do, I cannot imagine they’ll be too terrible. It only gets terrible when we need to model something larger than memory (ala topology)

P

> On Mar 27, 2019, at 10:02 AM, Darafei Komяpa Praliaskouski <me at komzpa.net> wrote:
> 
> Let's imagine I have a bunch 2.5D TINs representing some measurement - say, a travel time to a central point. I want to perform operations on top of these:
> 
>  - for each TIN in the group I would like to get a 2D polygon of bounds where it is the lowest in the group - "here is delivery area for this office" if you wish;
> 
>  - combine two TINs into a new one defining a lowest part of surface - "here is our delivery time map".
> 
> I understand the maths of this, but how an API for that can look like? Any examples to look at?
> 
> 
> -- 
> Darafei Praliaskouski
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