[Qgis-user] How to specify buffer distance in Metres when Using WGS84 (EPSG:4326) geometry.

[Bernie Connors]

Thanks for the advice. Creating the buffers in a projected coordinate
system and the reprojecting to 4326 was the answer I was looking for.

Bernie.

On Tue., Mar. 22, 2022, 7:51 a.m. Andrea Giudiceandrea via Qgis-user, <
qgis-user at lists.osgeo.org> wrote:

> *Bernie Connors* bernie.connors at unb.ca
> <qgis-user%40lists.osgeo.org?Subject=Re%3A%20%5BQgis-user%5D%20How%20to%20specify%20buffer%20distance%20in%20Metres%20when%20Using%0A%20WGS84%20%28EPSG%3A4326%29%20geometry.&In-Reply-To=%3CCAHRK%3DgCgcpb1FCcG3%3DACKJW%3DFWPaKTojurfxqUpdnRtQYbgrDQ%40mail.gmail.com%3E>
> *Mon Mar 21 12:44:58 PDT 2022*
> ------------------------------
>
>         I am using QGIS 3.20.0-Odense and I have a small set of points in
> EPSG 4326, a geographic projection.  I am trying to use the Multi Ring
> Buffer tool and the units for the buffer distance is in "degrees" but I
> want to specify a buffer of 5 metres.
>
>
> Hi Bernie,
> if you are using the "Multi-ring buffer (constant distance)" QGIS
> processing algorithm, then AFAIK the unit for the "distance" parameter
> depends on the unit of the CRS of the input layer and not of the CRS set
> for the project.
>
> So, in order to specify the distance in metres, you need to reproject the
> layer in a projected coordinate system whose unit is metres and use such
> projected layer as the input of the algorithm. Pay attention to to
> reproject your layer to a projected CRS (usually an UTM one) that is
> adequate for your study area in order to minimize the projection distortion.
>
> Regards.
>
> Andrea
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