On 2015-10-10 17:56, Hermann Peifer wrote:
On 2015-10-10 14:06, Even Rouault wrote:The implementation of ExportToWKT() in GDAL uses 15 decimal figures ("%.15f" printf formatting) whatever the source precision was, and as you point, whatever the intrinsic precision of the double value is.Does "%.15f" have any added value over "%.15g" (in the usual real-life GIS situations, I mean). I also vaguely remember some posting/ticket about "%.15f" versus "%.15g", including a request to partially revert a changeset. This was years ago, and I can't find at the moment.
The earlier issue was related to some change in the AAIGrid writer, http://trac.osgeo.org/gdal/ticket/3732. As hamish (from the GRASS community) wrote at the end of the ticket: "I'd point out that for IEEE double precision floating point you don't gain anything by going past %.17g."
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