(resending with correct title)
There's only two approaches to buffering in JTS currently - using the
buffer algorithm, or union buffers of a partitioned geometry.
A couple of ideas about the second approach:
- you should use Cascaded Union to make the union process as fast as
possible
- if partitioning by segment creates too many sub-buffers, is it possible
to partition into smaller pieces, keeping them small enough to keep the
projection distortion within limits?
---------- Forwarded message ----------
From: Alexander Parshin <[email protected]>
To: [email protected]
Cc:
Date: Thu, 30 Jan 2014 18:24:53 +0400
Subject: Calculation of geometry buffer on ellipsoid
Dear all,
I want to calculate buffer of geometry, which is located on ellipsoid (e.g.
WGS 84 Earth reference ellipsoid). Geometry is too extensive to select
projection without significant distance distortions. So, it isn't possible
to use buffer algorithm from JST directly.
Can you advise me the best way to solve this task? Is it reasonable to
modify implemented in JST buffer algorithm to work with geometry on
ellipsoid? Or is it more promising to split original geometry into small
parts, calculate buffer for them using projections and union them back?
Thanks in advance for any comments or suggestions!
Alexander.
PS. Our first variant was to calculate buffer for each line segment of the
geometry (rather simple task) and union them using JST. This method has
acceptable precision, but works too slow :(
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