Subject: [ggl] Point/Box in Box Test (Border Cases - 3D)
From: Barend Gehrels (barend)
Date: 2011-07-09 12:17:00
On 9-7-2011 2:53, Adam Wulkiewicz wrote:
> Barend Gehrels wrote:
>> It stays in namespace detail until there is complete agreement on the
>> interface (parameter, strategy, function name), so maybe you will have
>> to rename something in the future, but the functionality is there. I now
>> believe that it is the best to adapt to PostGIS and Oracle here, they
>> call it "coveredBy". See
>> http://postgis.refractions.net/documentation/manual-1.5/ST_CoveredBy.html,
>>
>> defining it as "Returns 1 (TRUE) if no point in Geometry A is outside
>> GeometryB", which is what I described. So covered_by would be a
>> convenient and (I think) intuitive name.
>
> If there are some functions which gives almost the same results, users
> may be confused. Then there are sentences in the documentation like
> the one in postgis docs: "There are certain subtleties to ST_Contains
> and ST_Within that are not intuitively obvious. For details check out
> Subtleties of OGC Covers, Contains, Within" plus some external pages
> describing these subtleties. I'd rather have one function with
> parameters, preferably compile-time ones and eventually a version with
> run-time parameters which calls compile-time version.
The compile-time parameters are a passed station: we cannot add them to
within anymore, without changing the interface.
The contains/within issue is well explained on that link, thanks. The
postgis documentation phrase "OGC Covers, Contains, Within" is incorrect
because Covers is not an OGC function.
Regards, Barend