I have derived contours from QL1 LIDAR data.
In my experience it is necessary to smooth the LIDAR data, generally
using a Gaussian filter.
The optimum amount of filtering depended on the desired contour
resolution - lighter filtering for 1' contour intervals, heavier
filtering for 10' contours. Heavier smoothing makes the contour lines
smoother, lighter filtering results in jagged lines following to much
local detail.
See QGIS manual, also:
<https://www.geodose.com/2018/05/how-to-create-contour-lines-in-qgis.html>
I have used several different contouring tools with good results, including:
Raster > Contour
Processing > GRASS > Raster > r.contour
Processing > SAGA > Features > Contour Lines from Raster
Processing > WhiteboxTools > Geomorphometric Analysis >
ContoursFromRaster
Garth Fletcher
On 1/19/26 10:02 AM, [email protected] wrote:
From:<[email protected]>
Subject: [Qgis-user] DEM to contours
I am trying to get a contour(s) line(s) derived from a DEM. I am using the
Raster Extractor (from Raster Processing Tool).
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