[Qgis-user] Preparation of road network layer
Nicolas Cadieux
njacadieux.gitlab at gmail.com
Thu Sep 2 19:18:28 PDT 2021
Hi,
Just realized I did not not do a "reply all" so I am resending this
answer. BTW I figured out today how to identify all those segments so
I will be modifying my model and posting them up soon.
Nicolas
On 2021-09-02 1:18 p.m., Nicolas Cadieux wrote:
>
> Hi,
>
> I am currently working on 3 models that will find many of the problems
> that you will have. (Disconnected line end, parallel edges,
> intersecting none connected lines...) This would be the perfect tool
> for you but I was having problems with the line merge issues that you
> are talking about here. I will send you a link to my models if you
> them. I will be adding them to the QGIS hub also and to my gitlab
> page https://gitlab.com/njacadieux.
>
> Be careful with applying the merge and then multipart to singlepart
> functions. That will fix your problems but it will also destroy the
> data as it will be deleted by the merge function. I will implement a
> fix to this in a future models. Keep in mind that merging these lines
> together will not affect the outcome of a shortest path analysis. It
> will only speed things up as the layer will be smaller and simplified.
>
> As for the length of the road segment, just use the field calculator,
> add a length float field and use $length expression. Only do that once
> all of you intersections are split and snapped.
>
> https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/attribute_table.html#editing-attribute-values
>
> Nicolas
>
>
> On 2021-09-02 3:46 a.m., Roland Spielhofer wrote:
>> Hi,
>> I have a road network layer (Multi Line String) I would like to
>> prepare so that each segment is a single line between intersections.
>> This would mean to connect consecutive lines without intersections
>> and split longer line segments at interesctions.
>> In the end I need statistics of the length of the road segments
>> between to junctions.
>> I remember a plugin capable of this but have not found anything useful.
>> BTW: Is there a way to make a fulltext search of the qgis-user
>> mailing list archive? Nabble is not available for this anymore.
>> Regards,
>> Roland
>>
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> --
> Nicolas Cadieux
> https://gitlab.com/njacadieux
--
Nicolas Cadieux
https://gitlab.com/njacadieux
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