sql server - combining Geography data -

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using works:

declare @shape geography  = 'polygon empty' set @shape.stsrid = 4326;  select @shape = @shape.stunion([polygondata])   [bla].[polygon]  select @shape.stastext();

on table this:

create table [space].[polygon](     [id] [uniqueidentifier] not null,     [polygondata] [geography] null)

unfortunately, slow. not think can index wonder if there alternative approaches can used merge polygons obtain outer points of combined polygon. thanks.


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