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

[Andrea Giudiceandrea]

> *Bernie Connors* bernie.connors at unb.ca 
> <mailto: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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