qgis_contours
Differences
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qgis_contours [2021/02/17 09:12] – created bushwalking | qgis_contours [2023/03/06 08:01] (current) – 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. |
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+ | 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. {{:: | ||
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+ | See [[https:// | ||
===== Simplifying ===== | ===== Simplifying ===== | ||
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- | Here is one approach, which involves adding a length attribute to each contour, and removing those that fall below a certain length. It may cause issues if you have short sections of contour near the edge of the map that you need. | + | Here is one approach, which involves adding a length attribute to each contour, and removing those that fall below a certain length. It may cause issues if you have short sections of contour near the edge of the map that you need. However, that shouldn' |
* Open Attribute Table (F6) | * Open Attribute Table (F6) |
qgis_contours.1613513573.txt.gz · Last modified: 2021/02/17 09:12 by bushwalking