[Qgis-user] different buffer for the same field

[Marco Grisolia]

Don't worry for the delay...
Your goal is to generate the buffer a priori (i.e. by assigning a
specific value of radius for each feature, without any preliminary
edit on the layer) or by searching for it in a field of the layer
(i.e. as Randal Hale suggested)?
Marco

2016-11-27 18:54 GMT+01:00 Azzurra Lentini <azzurralentini at gmail.com>:
> Dear Marco, apologies to write you only now.
> Yes with variable distance buffer is fine. Thanks a lot.
>
> If you can, could you please write me the PyQgis script for the other
> option?
>
> all regards, Azzurra
>
> 2016-11-16 9:22 GMT+01:00 Marco Grisolia <marco.grisolia5 at gmail.com>:
>>
>> If you want to assign a specified buffer for each kind of feature, you
>> may use a simple PyQGIS script using a call of buffer() from
>> QgsGeometry(). Are you able to do it? Otherwise I may try to write it
>> for you if my understanding of the problem was right.
>> Therefore, if your buffer distances are inside a field, you may use
>> the "Variable Distance Buffer" algorithm from Processing.
>> Best regards,
>> Marco
>>
>> 2016-11-16 1:26 GMT+01:00 Azzurra Lentini <azzurralentini at gmail.com>:
>> > Dear all,
>> >
>> > I have a shape file with a field called “type”.  In the “type”  field I
>> > have
>> > 4 kinds of samples ( 19 records).
>> >
>> > See in the attachment.
>> >
>> > The 4 samples are: normal fault, inverse fault, overthrust, syncline.
>> >
>> > I would like to create a buffer with different distance for each sample
>> > (the
>> > best it would be to obtain a shape with 5 different buffer distances).
>> >
>> > For example  the buffer distance for the sample “ normal fault” is 30 m,
>> > for
>> > the “inverse fault “ is 20 m, for the “overthrust” is 50 m and for the
>> > “syncline” is 20 m.
>> >
>> >
>> >
>> > How I can do this kind of buffer??
>> >
>> >
>> >
>> > Thanks A.L.
>> >
>> >
>> >
>> >
>> > --
>> > Dr. Hydrogeologist
>> > AZZURRA LENTINI
>> > Expert of evaluation environmental hazards
>> > GIS application
>> > Haity Mobile Tel: 0050946057393
>> > ++++++++++++++++++++++++++
>> > Italy Mobile Tel.: **(39) 338 24 40 676
>> > ++++++++++++++++++++++++++
>> > SKYPE azzurrahydro
>> > ++++++++++++++++++++++++++
>> > azzurralentini at gmail.com
>> > ++++++++++++++++++++++++++
>> > *Par respect pour l'environnement,*
>> >
>> > *n'imprimez ce mail qu'en cas d'absolue nécessité*
>> >
>> >
>> >
>> >
>> >
>> >
>> >
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>
>
>
>
> --
> Dr. Hydrogeologist
> AZZURRA LENTINI
> Expert of evaluation environmental hazards
> GIS application
> Haity Mobile Tel: 0050946057393
> ++++++++++++++++++++++++++
> Italy Mobile Tel.: **(39) 338 24 40 676
> ++++++++++++++++++++++++++
> SKYPE azzurrahydro
> ++++++++++++++++++++++++++
> azzurralentini at gmail.com
> ++++++++++++++++++++++++++
> *Par respect pour l'environnement,*
>
> *n'imprimez ce mail qu'en cas d'absolue nécessité*
>
>
>
>
>
>