Hi Denis
>Regarding Marco’s use case, using the 50cm limit should be equivalent
in map units, no?
The map units can be degrees and the layer units meters. Morover, the
distortion is not equal in x- and y- direction. So converting the 50cm
to degrees will be a different number depending where you are on the map
and in which direction. The same holds for conversions between meter
systems (e.g. google mercator <-> swiss grid). So the only more or less
accurate thing is to use layer units.
Regards,
Marco
On 14.12.2014 14:20, Rouzaud Denis wrote:
Hi,
I would say +1 for map units.
Regarding Marco’s use case, using the 50cm limit should be equivalent
in map units, no?
From my point of view, the settings of snapping are far too advanced
for 95% of the usage. Let’s not make them even more complicated, just
for a very specific use case.
My 2 ct.
Denis
On 13 Dec 2014, at 07:02, Martin Dobias <[email protected]
<mailto:[email protected]>> wrote:
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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Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
[email protected] http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee
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