[Qgis-user] Buffer with qgis : wgs84/mercator world?

[Jo]

If you store in a geography the unit is meters. If you store WGS84 in a
geometry it's radians/degrees. Try casting to ::GEOGRAPHY.

Jo

2013/5/10 image <lcelati at latitude-geosystems.com>

> Hello,
>
> i would like generate a buffer (20kms) around my shapefile (line).
>
> In a 1st time, i tied to do that with wgs84 parameters (for the layer &
> project). But the result was a big circle.
>
> In 2 2nd time, i converted my raw shapefile into wgs 84 mercator world. I
> entered this value for buffer-distance : 20000. i think the unity is meter.
> Could you confirm to me that the unity is meter?
>
> I succeed in generating a buffer. But when i measure the value of the
> buffer
> with the measurement tool, the value is 15 kms, no 20 kms.
>
> Could you throw light for me ?
>
> Thanks.
>
>
>
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