[CITE-Forum] reopnened: BBOX with zero extent (was: Re: Solved)
arnulf.christl at metaspatial.net
Tue Apr 9 15:47:00 EDT 2013
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instead I would suggest to modify the standard and add an informative
1. "A Bounding Box should not have zero area."
Reasoning: A point geometry has by definition a zero extent (area),
anything else would be an arbitrary.
Then add something like this:
Point geometries have by definition a zero extent and software has to
make sure this does not lead to division by zero (or whatever else
tech note might help to clarify the point).
Reasoning: This will make sure that implementers look into the problem
and make sure their software handles the problem correctly by at least
producing a sensible error message.
On 04/09/2013 07:05 PM, Richard Martell wrote:
> Hi all,
> Clause 6.7.4 in ISO 19128 (WMS 1.3) states that:
> "A Bounding Box shall not have zero area."
> This constraints applies to both service metadata and requests. If
> the current test suite does not verify this for the capabilities
> document (getcapabilities.xml doesn't appear to), then a new test
> is warranted.
> -- Richard
>> -----Original Message----- From:
>> cite-forum-bounces+rmartell=galdosinc.com at lists.opengeospatial
>> [mailto:cite-forum-bounces+rmartell=galdosinc.com at lists.openge
>> ospatial.org] On Behalf Of Sebastian Goerke Sent: Tuesday, 02
>> April, 2013 01:02 To: cite-forum at lists.opengeospatial.org
>> Subject: Re: [CITE-Forum] Solved
> Hi Arnulf,
> the WMS spec says in 126.96.36.199 BBOX:
> If a request contains an invalid BBOX (e.g. one whose minimum X is
> greater than or equal to the maximum X, or whose minimum Y is
> greater than or equal to the maximum Y) the server shall throw a
> service exception.
> This implicates, that requesting a bbox with equal ll and ur is
> impossible for compliant WMS implementations. As a consequence,
> there is somehow an implicit requirement for WMS servers, not to
> advertise such bounding boxes as they are not useable. Maybe this
> is something for a change request.
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