Re: [SQL] line datatype

From: Thomas Lockhart <lockhart(at)fourpalms(dot)org>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: Tim Hart <tjhart(at)mac(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [SQL] line datatype
Date: 2002-07-16 06:10:29
Message-ID: 3D33B8D5.D8A2E1CE@fourpalms.org
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> It would be nice to get the line type working 100%. Thomas says the
> problem is input/output format. I don't completely understand.

The issue is in choosing an external format for LINE which does not lose
precision during dump/reload. Internally, LINE is described by a formula
which is likely subject to problems with limited precision for some line
orientations.

Does anyone have a suggestion (perhaps drawn from another GIS package)
for representing lines? We already have this implemented internally, and
the algorithms are used to support other data types; the only unresolved
issue is in how to input the values.

- Thomas

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