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<p>Hi Eddisson?</p>
<p>Which z value? In your example you have different z-values
attached to vertices, but you can only hold a single z-value per
record.</p>
<p>There are expressions like z(feature) that work on points, and
there are expressions like point_n(LineStringGeom) to access a
certain node. With this, you could say extract the z-values of the
first node of a feature.</p>
<p>Getting an aggregate (say mean z-value) of all nodes would be
more complex and I am not sure if it can be done without Python.</p>
<p>Andreas<br>
</p>
<br>
<div class="moz-cite-prefix">On 15.09.2017 16:37, Eddison Araya
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAC-LqCmbmm5iZojLtzN0AstZ=n99-ypemRRjXTukKU84VQ_fqA@mail.gmail.com">
<div dir="ltr">
<div>Hello! a pleasure to greet Do you know how to convert a 3d
polyline shapefile to a 2D and keep the Z value in your
attribute table? Thank you</div>
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<div><img src="cid:part1.B5627249.4FBF8E47@carto.net"
alt="Imágenes integradas 1" class="" width="535"
height="262"><br>
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