On Mon, Nov 23, 2015 at 6:00 PM, Régis Haubourg <[email protected]> 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. > 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. > _______________________________________________ > Qgis-developer mailing list > [email protected] > List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer _______________________________________________ Qgis-developer mailing list [email protected] List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer
