[Qgis-user] Snapping points and lines in 3D

Wed Oct 31 00:19:37 PDT 2018

Hi,

Following your feedback I realize that the issue in its full extent is more complicated, than I anticipated. However for a start a behaviour similar to the snapping of nodes in linestrings would be far better than just ignoring the Z value. You might argue that this isn't true snapping in 3D, but merely a transfer of the Z value when points snap in the 2D plane. Nonetheless it is what I and my users are looking for, and it would be a big improvement compared to the current state of things!

Entering the Z value manually in the vertex editor is cumbersome, error prone and not desirable at all! So if better work arounds exist, I'm all ears! :-)

Best regards,

Morten Storm

Fra: Régis Haubourg [mailto:regis.haubourg at gmail.com] 
Sendt: 30. oktober 2018 18:30
Til: DelazJ
Cc: Morten Storm; Saber Razmjooei; QGIS list
Emne: Re: [Qgis-user] Snapping points and lines in 3D

Hi, 

much more than that in fact. The idea xould be to have interactive modifiers to list all available features at a possible snapping location. Z snapping tolerance would only be only here to help in not snapping a 2D point if the Z value is too far away from the existing one (for instance). 

The default Z value has been added as an answer to the fact that most providers can't handle Null Z values, so that you can set it to 9999 if you want and consider it is a no data information. 

In the meantime, I realized that PostgGIS is totally able to store NaN values for Z, M (even XY too). Shapefile definitely cannot. 

Le mar. 30 oct. 2018 à 17:44, DelazJ <delazj at gmail.com> a écrit :

	Hi,

	Do you mean something like Settings --> Options --> Digitizing --> Default Z value?

	This is the Z-related option I can remember for digitizing (not really a snapping one though).

	Harrissou

	Le mar. 30 oct. 2018 à 16:27, Morten Storm <morten.storm at artogis.dk> a écrit :

		Hi Saber and Régis,

		Thanks for your prompt replies! I am not trying to digitize in 3D view - but was merely hoping to snap in all 3 dimensions when doing ordinary editing with snap to points containing this information. I understand that this may be a bigger issue, than I originally anticipated - but I also think that I (and the other users, I know) would prefer "unconditional" snapping to Z, if the information is there and until the whole topic had been resolved.

		Do you by any chance have a work around for this?

		Best regards,

		Morten Storm

		Fra: Régis Haubourg [mailto:regis.haubourg at gmail.com] 
		Sendt: 30. oktober 2018 16:16
		Til: Saber Razmjooei
		Cc: Morten Storm; QGIS list
		Emne: Re: [Qgis-user] Snapping points and lines in 3D

		Hi, It's not by chance, we have been working a lot to try to make the digitizing maptools catch with the 3D API for geometries, because before 2.18, it was just destroying Z and M values for all operations. 

		I think some use cases are still missing probably, and some are not easy to solve by one default behavior, because choosing if you want to snap Z value or not should be a user choice. 

		We have been discussing a lot about going towards some interactive snapping widget to be able to choose which feature to grab, which to snap to, use Z or not, use a Z snapping tolerance or not. It's a big topic! 

		Best regards

		Régis

		Le mar. 30 oct. 2018 à 15:29, Saber Razmjooei <saber.razmjooei at lutraconsulting.co.uk> a écrit :

			Hi Morten,

			This is probably by chance that the line works! Have you tried to move the point using the node tool?

			Proper 3D digitizing from within the 3D map is in our to-do list for future, but if you'd be interested in sponsoring the feature, feel free to contact us.

			Regards

			Saber

			On Tue, 30 Oct 2018 at 08:08, Morten Storm <morten.storm at artogis.dk> wrote:

				Hi,

				I have a 3D point layer from a GPS device (with x, y AND z coordinates).

				I want to digitize new features in 3D point and 3D line layers with snapping in all 3 dimensions to these GPS points.

				This works great for line features - every node gets 3D coordinates when snapped to my GPS points. However point features only get 2D coordinates (zero for z)!? Do I do something wrong - or is this by design?

				I have tried this in QGIS 2.18.21 and QGIS 3.4.0.

				Best regards,

				Morten Storm
				Chefkonsulent 

				Fejl! Filnavn er ikke anført. <http://www.artogis.dk/> 

				Fejl! Filnavn er ikke anført.

				_______________________________________________
				Qgis-user mailing list
				Qgis-user at lists.osgeo.org
				List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
				Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

			-- 

			Saber Razmjooei

			www.lutraconsulting.co.uk
			+44 (0)7568 129733

			_______________________________________________
			Qgis-user mailing list
			Qgis-user at lists.osgeo.org
			List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
			Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

		_______________________________________________
		Qgis-user mailing list
		Qgis-user at lists.osgeo.org
		List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
		Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20181031/833919c3/attachment-0001.html>