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Numbers in any programming language does not have "absolute" precision. As they must be represented as bits in the computer hardware its precision is limited. Anyway review this links, because maybe they can help you: http://comments.gmane.org/gmane.comp.gis.gdal.devel/19331 http://lists.osgeo.org/pipermail/gdal-dev/2011-August/029793.html


GDAL supports two SQL dialects: the default OGR dialect and an alternative SQLite (Spatialite) dialect. Both dialect support selecting geometries by geometry type. Ogrinfo tool is recommended for experiments because by using it the possible troubles with writing the result out can be avoided. If output from ogrinfo is good then the reading side is OK too. ...


If you look inside http://trac.osgeo.org/gdal/browser/branches/1.11/gdal/ogr/ogrsf_frmts/mitab/mitab_spatialref.cpp you see: { 6277, 79, "OSGB_1936", 9, 375, -111, 431, 0, 0, 0, 0, 0}, The shift values were replaced in GDAL some time ago, but obviously not in the mitab driver. Keep in mind that EPSG:27700 in the original EPSG definition does not obey any ...

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