[postgis-users] where 2.98023223876953e-08 comes from ?

[karpi.lists at email.cz]

Hello, me again ,)
A little better formulation of my question:
How is possible, that this totally different polygons has exactly "the same" area:

0103000020110800000100000004000000CDCCCC4C5AFD24C1C3F5289CB72830C19A9999195DFD24C19A999919BA2830C113D067985AFD24C1AB1865DFB72830C1CDCCCC4C5AFD24C1C3F5289CB72830C1

01030000201108000001000000040000000AD7A3F0B4FA24C1F6285CCFE72830C11F85EB51C1FA24C1C3F5289CED2830C1F1B5B21AB5FA24C1AF6910E3E72830C10AD7A3F0B4FA24C1F6285CCFE72830C1

0103000020110800000100000004000000E17A14AE84FA24C1B81E85EBE32830C148E17A149DFA24C17B14AE47ED2830C1B46E579F88FA24C15DE9AD6EE52830C1E17A14AE84FA24C1B81E85EBE32830C1

0103000020110800000100000004000000C41272E8A80325C1E59543B0582930C1295304CEFE0325C17B8BFD8F2B2930C11574FEADB00325C187CF0C9B542930C1C41272E8A80325C1E59543B0582930C1

010300002011080000010000000500000033333333700425C1D7A370FDEF2830C1295304CEFE0325C17B8BFD8F2B2930C13418BA2B240425C1B8339FEE172930C1D787A7992E0425C1B018F873122930C133333333700425C1D7A370FDEF2830C1

There is no problem about this, I would like only understand and avoid this in the future. Is there some reading about internal postgis manipulations, which explain that issue, plz? Thanks for any response,
pk






> ------------ Původní zpráva ------------
> Od:  <karpi.lists at email.cz>
> Předmět: [postgis-users] where 2.98023223876953e-08 comes from ?
> Datum: 13.8.2011 21:27:13
> ----------------------------------------
> 
> Hello postgisers,
> 
> I'm fighting with points lying (more exactly not lying) on lines. There is some
> entities imported from cad project, which makes microscopic slivers and gaps..
> But only two kinds of area appeas:
> 
> Zero areas like this:
> '01030000201108000001000000040000009A9999992FF924C17B14AE47782930C114AE476118F924C1AE47E17A6C2930C1E12088471CF924C188962C766E2930C19A9999992FF924C17B14AE47782930C1'
> 
> and not zero areas like this:
> '0103000020110800000100000004000000E17A14AE84FA24C1B81E85EBE32830C148E17A149DFA24C17B14AE47ED2830C1B46E579F88FA24C15DE9AD6EE52830C1E17A14AE84FA24C1B81E85EBE32830C1'
> 
> The not zero area is in most of cases exactly 2.98023223876953e-08. Why right
> this number? Do you someone know why just this area? I'm only curious..
> 
>                                                                thx, pk
> 
> 
> 
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> 

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