[Qgis-developer] Snapping tolerance

Andrea Peri aperi2007 at gmail.com
Sat Dec 13 00:39:03 PST 2014

perhaps I dont understand well what this mean.
Infact we usually editing always in native reference system, never
editing in reprojected SRS.

But I guess that using the project reference system instead of the
layer srs for snap operations
could cause the snap will affect from an error due to the reprojection
If this is true, this could mean that the editing result could change
moving from a PC where the precision in due to some local NTv2 data
(more precision in reporjection), to another pc where the NTv2 are not
And also it could depend from the trasformation choose for the reprojection.

Im worng the mean of the snap question ?



2014-12-13 7:02 GMT+01:00 Martin Dobias <wonder.sk at gmail.com>:
> Hi
> Recently I have been working on some snapping improvements (more about that
> later) and I have found one slightly surprising thing about the
> configuration of tolerances: if the tolerance unit is set to "map units", it
> actually means "layer units" - i.e. units in layer's CRS and not in
> project's CRS. Recently there was even a bug report filed for that:
> https://hub.qgis.org/issues/11634
> I would like to change the behavior so that the "map units" in snapping
> config dialog would mean units in project's CRS. Would there be any
> objections?
> Alternatively we could just rename "map units" to "layer units" to make it
> less surprising (and eventually add a third option to use project's units).
> Cheers
> Martin
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Andrea Peri
. . . . . . . . .
qwerty àèìòù

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