[Qgis-user] After deleting points, attribute rows persist
Havard Tveite
havard.tveite at nmbu.no
Tue Jan 8 00:45:08 PST 2019
We have a tool ("Move Features") for moving a geometry.
For consistency, that tool should be used also for moving points.
A new tool ("Move feature part") would eliminate the need for
overloading the "Vertex Tool". The "Vertex Tool" would then be
used only for modifying the shape of lines (including polygon
outlines).
Overloading the vertex tool may be convenient for many users and
perhaps developers, but will probably be confusing for most
users (even if it is renamed to "Vertex / Point Tool"). So
overloading should be avoided.
A side note: To raise the awareness of the distinction between
multi and non-multi geometry layers, could it be an idea to
indicate that a layer is a multi-geometry layer in the Layers
panel. Either by adding a multi-symbol, or by making new
symbols for multi-points, multi-lines and multi-polygons.
Håvard
On 08. jan. 2019 09:21, Matthias Kuhn wrote:
> On point layers, I was always thinking of points being composed of a
> single node. On multi point layers, I was thinking of each part being
> composed of a single node, so I wasn't thinking of "either a node or a
> point" but both. With this concept in mind, the whole set of available
> tools works fine and predictable for me.
>
> Moving parts is supported now via the node tool by selecting all nodes
> of a part. It's also possible to delete a part on a
> multiline/multipolygon layer with the node tool. So also with respect to
> this it doesn't do anything special for point layers.
>
> I can see, that it may lead to confusion sometimes as described in the
> original email here. I am not able to say how often this happens in
> comparison to how often the node tool is used consciously.
>
> The node tool even gives a hint on the message bar, that "the geometry
> has been cleared, please use the add part tool to set the geometry for
> this feature". So it's trying to not be too obscure. Maybe the whole
> confusion can be ironed out by polishing this text a bit?
>
> Considering the separate tool for moving parts of multi-geometries, I
> agree it sounds like a valid tool to have, but I am a bit concerned of
> the clutter to benefit ratio. Does anyone have an idea how often this
> would be useful in reality?
>
> Thanks
>
> Matthias
>
> On 1/8/19 9:02 AM, Havard Tveite wrote:
>> I agree that disabling the vertex tool for point layers is a good
>> idea. It will improve consistency and avoid confusion.
>> A separate tool for moving a part of a multi-geometry would be
>> useful.
>>
>> Håvard
>>
>> On 08. jan. 2019 07:53, Bernhard Ströbl wrote:
>>> Hi Saber,
>>>
>>> Delete a single point (part) in a multi-point layer with remove part
>>> tool (as you would with e.g. a multi-polygon layer).
>>> Move single point in a multi-point layer: There is no option to move
>>> a part in a multi-line or multi-polygon layer either (or I am not
>>> aware of it). Why is it different for multi-point? If there is a need
>>> to move parts in a multi-* layer, a dedicated tool should be
>>> established IMHO covering all cases.
>>>
>>> Do not misunderstand me, I really do not bother but I started
>>> thinking about the tool's behaviour for point layers during this
>>> thread and IMHO the behaviour is not consistent:
>>> 1) the tool is called _node_ but it works on _points_, too
>>> 2) It can be used to move/delete single point geometries or parts of
>>> multi-points, but it cannot be used to move parts when editing lines
>>> or polygons (neither single nor multi), furthermore for deleting
>>> parts there is another tool that does exactly the same.
>>>
>>> Bernhard
>>>
>>> Am 07.01.2019 um 16:59 schrieb Saber Razmjooei:
>>>> Hi Bernhard,
>>>>
>>>> How about multi-point layer? All the features will move/delete with
>>>> the other tools.
>>>>
>>>> Regards
>>>> Saber
>>>>
>>>> On Mon, 7 Jan 2019 at 15:55, Bernhard Ströbl
>>>> <bernhard.stroebl at jena.de <mailto:bernhard.stroebl at jena.de>> wrote:
>>>>
>>>> Maybe the node tool shouldn't be available when editing a point
>>>> layer?
>>>> Anything one may want to do with points can be done using the other
>>>> tools (move, delete part). I was always wondering why it is there
>>>> because AFAIU nodes are not individual features, they only exist as
>>>> part
>>>> of a line or polygon boundary, but points in a point layer are
>>>> individual features themselves.
>>>>
>>>> Bernhard
>>>>
>>>> Am 07.01.2019 um 16:25 schrieb DelazJ:
>>>> > Hi Micha,
>>>> >
>>>> > The Node Tool is not meant to remove features, but to
>>>> edit/remove
>>>> their
>>>> > geometries. Your feature persists in your dataset through their
>>>> > attributes and you can later use the "Add part" tool to
>>>> create a new
>>>> > geometry.
>>>> >
>>>> https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html#vertex-tool
>>>>
>>>> > For full deletion (data + geometry), you should use the the
>>>> "Delele
>>>> > selected" tool, with a red bin.
>>>> >
>>>> > Regards,
>>>> > Harrissou
>>>> >
>>>> > Le lun. 7 janv. 2019 à 16:15, Micha Silver <tsvibar at gmail.com
>>>> <mailto:tsvibar at gmail.com>
>>>> > <mailto:tsvibar at gmail.com <mailto:tsvibar at gmail.com>>> a écrit :
>>>> >
>>>> > Hi Alex:
>>>> >
>>>> > Linux Mint 19
>>>> >
>>>> > gdal 2.2.3
>>>> >
>>>> > QGIS 3.4.3
>>>> >
>>>> >
>>>> > Just out of curiosity, I did the same on a debian buster
>>>> machine
>>>> > (QGIS 2.18) and found the same: deleting vertices (with
>>>> the node
>>>> > tool) on a point vector layer does not delete the
>>>> attribute rows.
>>>> >
>>>> >
>>>> > On 1/6/19 11:38 PM, Alexandre Neto wrote:
>>>> >> What's your platform?
>>>> >> What's the version of gdal?
>>>> >>
>>>> >> Thanks,
>>>> >>
>>>> >> Alex Neto
>>>> >>
>>>> >> A dom, 6/01/2019, 12:55, Micha Silver <tsvibar at gmail.com
>>>> <mailto:tsvibar at gmail.com>
>>>> >> <mailto:tsvibar at gmail.com <mailto:tsvibar at gmail.com>>>
>>>> escreveu:
>>>> >>
>>>> >> I have found that after deleting some points in both a
>>>> >> shapefile and a geopackage layer, the attribute rows
>>>> remain in
>>>> >> the table (with null geometry). Is this expected?
>>>> I'm using
>>>> >> 3.4.3, and I don't remember that being so in earlier
>>>> versions.
>>>> >>
>>>> >>
>>>> >> I removed the "phantom" rows by selecting by
>>>> expression:
>>>> >> '$geometry is null' and then deleting. Still the
>>>> behavior was
>>>> >> surprising. I hope this is not a resurrection of
>>>> >> https://issues.qgis.org/issues/11007 ??
>>>> >>
>>>> >>
>>>> >> Thanks
>>>> >>
>>>> >> --
>>>> >> Micha Silver
>>>> >> Ben Gurion Univ.
>>>> >> Sde Boker, Remote Sensing Lab
>>>> >> cell: +972-523-665918
>>>> >>
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>>>> >> --
>>>> >> Alexandre Neto
>>>> >> ---------------------
>>>> >> @AlexNetoGeo
>>>> >> http://sigsemgrilhetas.wordpress.com
>>>> >> http://gisunchained.wordpress.com
>>>> >
>>>> > --
>>>> > Micha Silver
>>>> > Ben Gurion Univ.
>>>> > Sde Boker, Remote Sensing Lab
>>>> > cell: +972-523-665918
>>>> >
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>>>>
>>>>
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>>>>
>>>>
>>>> --
>>>> Saber Razmjooei
>>>> www.lutraconsulting.co.uk <http://www.lutraconsulting.co.uk>
>>>> +44 (0)7568 129733
>>>
>>>
>>
> --
> Matthias Kuhn
> matthias at opengis.ch <mailto:matthias at opengis.ch>
> +41 (0)76 435 67 63 <tel:+41764356763>
> OPENGIS.ch Logo <http://www.opengis.ch>
--
Håvard Tveite
Faculty of Science and Technology, NMBU
Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY
Phone: +47 67231548 Web: http://www.nmbu.no
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