Wikipedia:Graphics Lab/Resources/QGIS/Shaded reliefs: Difference between revisions
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Bourrichon (talk | contribs) m →Creating a shaded relief: orth |
Bourrichon (talk | contribs) →Creating a shaded relief: +test de "Raster Terrain Analysis plugin" => very usefully plug-in (but please corrige mon bad anglais, Yug ;) |
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== Creating a shaded relief ==
=== Using
:{{in progress}} Need QGIS 1.8.
According to [http://www.sourcepole.com/2012/1/16/shaded-relief-maps-with-qgis this recent post and its comments] :<br />▼
or
:> QGIS 1.8 > Raster > Terrain Analysis > Shaded relief (the raster will be only the shade)
It is necessary to enter a number as a "z factor". "z factor" may be 1 or a big number, like 10000 or 100000, in order to make a smooth relief. So, you have to try different numbers as "z factor".
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=== Using Gdaldem hillshade (very good) (only Linux)===
* Tutorial: [http://developmentseed.org/blog/2009/jul/30/using-open-source-tools-make-elevation-maps-afghanistan-and-pakistan Using Gdaldem hillshade]
On Ubuntu, the install of QGis *seems* to also install Gdaldem hillshape. Its [http://www.gdal.org/gdaldem.html command] [http://www.gdal.org/gdaldem.html#gdaldem_hillshade is]:
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Then, load into QGis, apply an opacity of 30%, and it will look great. ; )
=== Using the plugin "Shaded relief plugin" (medium) (Windows + Linux)===
:Forum page: [http://forum.qgis.org/viewtopic.php?f=2&t=8747&p=19646 Using QGis Shaded relief plugin (forum question)]
:Warning: this way request a lot of memory and failed for middle size tiles.
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The operation can be applied to a serie of SRTM .tif files by selecting the containing folder.
▲According to [http://www.sourcepole.com/2012/1/16/shaded-relief-maps-with-qgis this recent post and its comments] :<br />
▲:>> QGIS > Raster >Terrain Analysis->Relief
▲:>>> Follow the tutorials [http://www.sourcepole.com/2012/1/16/shaded-relief-maps-with-qgis n⁰1] and [http://underdark.wordpress.com/2012/01/19/a-guide-to-beautiful-reliefs-in-qgis/# n⁰2]
== Optimizing a shaded relief ==
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