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qgis_contours [2021/02/17 09:12]
bushwalking created
qgis_contours [2021/03/19 12:12]
bushwalking
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   * GDAL : Raster Extraction : Contour (same as Raster -> Extraction -> Contour...)   * GDAL : Raster Extraction : Contour (same as Raster -> Extraction -> Contour...)
  
-Below is an example of contours created without and with [[depressionless_dem|sink removal]]. The contours on the right have been derived from a DEM where the sinks (in yellow on the left) have been filled.+Below is an example of contours created without and with [[qgis_depressionless_dem|sink removal]]. The contours on the right have been derived from a DEM where the sinks (in yellow on the left) have been filled.
 {{:2019_02_08_12_17_09_untitled_project_qgis.png?300|}} {{:2019_02_08_12_17_09_untitled_project_qgis.png?300|}}
 {{:2019_02_08_12_17_57_untitled_project_qgis.png?300|}} {{:2019_02_08_12_17_57_untitled_project_qgis.png?300|}}
 +
 +It is worth noting that a [[qgis_depressionless_dem|depressionless DEM]] does not guarantee that there will be no contour sinks. A deep diagonal channel combined with a small contour interval can still cause sinks. {{::qgis_raw_contours.png?nolink&600|}}
 +
 +See [[https://gis.stackexchange.com/questions/390221/fix-unwanted-sink-contours-from-hydrologically-correct-dem/|GIS Stack Exchange]] for options of how to deal with this.
  
 ===== Simplifying ===== ===== Simplifying =====
qgis_contours.txt ยท Last modified: 2021/03/19 12:12 by bushwalking