[Qgis-developer] Tool to pick up linear referencing measure from mouse

[Nyall Dawson]

On 25 Nov 2015 1:39 AM, "Radim Blazek" <radim.blazek at gmail.com> wrote:
>
> On Mon, Nov 23, 2015 at 6:00 PM, Régis Haubourg
> <regis.haubourg at eau-adour-garonne.fr> wrote:
> > Hi,
> > I'm having a classical use case here. Before starting a new plugin, and
> > since it is a very common task in GIS, I would like to know if anyone
has
> > made something alike:
> >
> > - I have a postgis db with LINESTRINGM routes (watercourses already
> > calibrated with measures).
> >
> > - I have a non geometric table registering events with start and end
> > measures + identifier of my routes (watercours ID).
> >
> > - I create my event in the attribute table, with one ID and two manually
> > typed measures, then a view cast it to spatial view using
> > locate_beetween_measure function.
> >
> > I would like to create a form with two tools dedicated to "pick up" my
route
> > and the measure. i've done it in Arcview 3.2 once in the old past..
> > What could be the current better and simpler approach in QGIS?
>
> I think that now (>=2.8), when QGIS geometry supports M (measure), the
> measure calculated for the nearest point on the identified line
> could/should be added to derived attributes in standard identify
> results.

And as of 2 days ago, it does: ;)

https://github.com/qgis/QGIS/commit/1f0d24a0c7a6555ced117ecfc08a73afb1f31b46

Nyall

>
> > LRS plugin does not have that feature, and requires to recalibrate
layers
> > from scratch.
>
> Similarly Locate, Create events and Calculate measures tools in the
> LRS plugin should be extended  to support existing layers with
> measure.
>
> Radim
>
> > Could we dream for the future of a new generic form widget with custom
> > expressions to get attributes or geometric information from a layer
(with
> > snapping options )?
> >
> > Cheers
> >
> > Régis
> >
> >
> >
> > --
> > View this message in context:
http://osgeo-org.1560.x6.nabble.com/Tool-to-pick-up-linear-referencing-measure-from-mouse-tp5238110.html
> > Sent from the Quantum GIS - Developer mailing list archive at
Nabble.com.
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