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Re: sdo_geom.sdo_area gives negative areas
comp.databases.oracle.misc comp.databases.oracle.misc
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#1
 
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Re: sdo_geom.sdo_area gives negative areas -
05-09-2008
, 01:40 AM
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Hi, I used the sdo_geom.sdo_area function on some polygons in my database. The result is a negative number, the absolute value seems to be right. At a first glance, I did not find anything on this in the docs. Is this maybe due to a wrong direction (clockwise vs. counter-clockwise) of the points? If so, is this "bad" apart from the negative area values? |
direction, it is a 'hole' or a 'donut'. You will encounter problems
calculating overlaps etc. About the negative area: I can't recall this has
anything to do with the direction. What tolerance do you use?
Shakespeare
#2
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Hi, I used the sdo_geom.sdo_area function on some polygons in my database. The result is a negative number, the absolute value seems to be right. At a first glance, I did not find anything on this in the docs. Is this maybe due to a wrong direction (clockwise vs. counter-clockwise) of the points? If so, is this "bad" apart from the negative area values? |
direction, it is a 'hole' or a 'donut'. You will encounter problems
calculating overlaps etc. About the negative area: I can't recall this has
anything to do with the direction. What tolerance do you use?
Shakespeare
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