[Qgis-user] Buffer by Attribute Issue

[chris hermansen]

Peter and list

On Thu, Dec 16, 2021 at 7:08 AM Peter Devanney <peter at devanney.ca> wrote:

> Chris
>
> The buffer input is a point the lat and long are Doubles. The buffer
> distance variable is a Double. Using EPSG 3857 for all.
>

I just created a point shapefile in EPSG:3857, added a field called
"bufferdist", added three points with bufferdist set to 1000, 2000 and 5000
respectively.

EPSG:3857 is in metres, are readily visible and as far as I can tell from
measuring the buffers were correctly created in the correct size.

In the buffer dialogue did you click on the button next to the distance /
units pair and next to "field type >" select your field, which would
deactivate the distance / units pair?

Your mention of "lat and long" troubles me.  EPSG:3857 is a projected
coordinate system, not a lat/lon system.

>
> Not sure what the protocol on the list is or if it will accept a small 2
> MB .mp4 but I can show what I am doing for workflow if that might help?
>
> thanks Chris
>
> Peter
>
> On Wed, Dec 15, 2021 at 6:42 PM chris hermansen <clhermansen at gmail.com>
> wrote:
>
>> Peter and list,
>>
>> On Wed, Dec 15, 2021 at 7:26 AM Peter Devanney <peter at devanney.ca> wrote:
>>
>>> Hi Folks
>>>
>>> Have a table full of points that I want to buffer by a variable
>>> distance. The distance is an attribute in the input table in km.
>>>
>>> Using Vector>Geoprocessing>Buffer It works fine if I specify a fixed
>>> buffer.
>>>
>>> When I run it with the attribute selected it runs fine but it will not
>>> paint the buffers. At first I thought I had a unit issue so added an
>>> expression to multiply the attribute by 1000 to get to km from m as I
>>> wasn't sure if the default was m.
>>>
>>> The buffered output behaves totally normally so I can label, and zoom to
>>> features... All looks fine except no actual buffers draw. Symbology panel
>>> looks normal.
>>>
>>> Just wondering if anyone has seen this or knows of a workaround or
>>> thoughts on what I am doing wrong.
>>>
>>> What is the type of your buffer item?  What are the typical values?
>>
>> What is your CRS?
>>
>>
>> --
>> Chris Hermansen · clhermansen "at" gmail "dot" com
>>
>> C'est ma façon de parler.
>>
>

-- 
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.
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