[Qgis-user] Buffer by Attribute Issue

Peter Devanney peter at devanney.ca
Thu Dec 16 10:56:01 PST 2021


Example point in the project CRS ( EPSG:3857) -11923424,5461258

I have had the buffer problem with a GCS like but just usually convert to a
UTM to do analysis.
I was using a pseudo mercator here because the web maps are in that CRS and
don't distort as a base map for a quick view of some data. Buffer works
with a fixed distance specified in the Buffer dialog; but not when I try to
use an attribute from the table as a buffer distance variable.

thanks
Peter


On Thu, Dec 16, 2021 at 10:19 AM Richard Duivenvoorde <rdmailings at duif.net>
wrote:

> On 12/16/21 16:08, Peter Devanney 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.
>
> So your data is in lat/lon so in degrees?
> Or in EPSG:3857 units (more or less meters)?
> Can you show the coordinates of your point layer (also EPSG:3857 ?)
>
> What if you select/copy one point, does it look like (a point in NL)
>
> wkt_geom
> Point (542953.32029126526322216 6792876.35233329329639673)
>
> or
>
> wkt_geom
> Point (5.50943334180317645 52.15814766031191851)
>
> ?
>
>
> > 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?
>
> Nope, I think attachments > 75kB are removed or held back
>
> Regards,
>
> Richard
>
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