Ernst Meier wrote:
> Hello,
>
> I have created an SHP-File (polygon) with ArcGIS 9.2. I let ogrinfo show the coordinates of the vertexes and got decimals like .123000005 instead of
> .123 or .129999999999 instead of .130
>
> Any Ideas? What causes this change? Maybe a bug in ArcGIS or FWTools?
Ernst,
Shapefile coordinates are stored in double precision IEEE floating point
and in that representation there are numbers that cannot be exactly
represented - perhaps including values like .123. In these cases the
internal representation is very close and whether you see 0.123 or
0.12999999999999 will depend on the precision displayed. So I believe
ogrinfo is just reporting so much precision that you see these small
inaccuracies.
There isn't really much to do about this.
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam,
warmerdam@...
light and sound - activate the windows |
http://pobox.com/~warmerdamand watch the world go round - Rush | Geospatial Programmer for Rent
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