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

[Régis Haubourg]

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.*
>>
>>
>>
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>>
>>
>>
>> --
>>
>> Saber Razmjooei
>>
>> www.lutraconsulting.co.uk
>> +44 (0)7568 129733
>>
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