OGC Simple Features Acces 1.21

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OGC Simple Features Acces 1.21

Ivan Santiago-2

Hello all


This is not directly related to Postgis but...

I was reading the PDF document:

http://portal.opengeospatial.org/files/?artifact_id=25355


Am I wrong or there is a contradiction in this?

"The Overlaps relationship is defined for A/A, L/L and P/P situations. (p.38)

... so they must have the same dimension ...


... but in figure 12a, page 39 ...

  it shows an 'overlap' example using geometries of different dimensions (L/A)

???


Iván Santiago
GIS Specialist
Information Technologies
PR Office of Management and Budget
787.725.9420 x 2409
http://gis.pr.gov/

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Re: OGC Simple Features Acces 1.21

Paul Ramsey
An inconsistency in an OGC specification!?!?!? 
Could be. Fact remains, they do provide examples of mixed dimensional inputs to the predicates, and they are the most confusing examples imaginable, since what does it mean for polygons (or points) to "cross"? Or for points to "overlap" vs "intersect". 
If you're looking for precisely defined semantics of interaction, go with the Relate() functions and DE9IM patterns, I'd recommend.
P

On Thu, Sep 15, 2016 at 6:15 AM, Ivan Santiago <[hidden email]> wrote:

Hello all


This is not directly related to Postgis but...

I was reading the PDF document:

http://portal.opengeospatial.org/files/?artifact_id=25355


Am I wrong or there is a contradiction in this?

"The Overlaps relationship is defined for A/A, L/L and P/P situations. (p.38)

... so they must have the same dimension ...


... but in figure 12a, page 39 ...

  it shows an 'overlap' example using geometries of different dimensions (L/A)

???


Iván Santiago
GIS Specialist
Information Technologies
PR Office of Management and Budget
<a href="tel:787.725.9420%C2%A0x%202409" value="+17877259420" target="_blank">787.725.9420 x 2409
http://gis.pr.gov/

_______________________________________________
postgis-users mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/postgis-users


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