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List: grass-commit
Subject: [GRASS-SVN] r71293 - grass-addons/grass7/imagery/i.superpixels.slic
From: svn_grass () osgeo ! org
Date: 2017-07-22 11:34:36
Message-ID: 20170722113436.8A64D390122 () trac ! osgeo ! org
[Download RAW message or body]
Author: wenzeslaus
Date: 2017-07-22 04:34:36 -0700 (Sat, 22 Jul 2017)
New Revision: 71293
Modified:
grass-addons/grass7/imagery/i.superpixels.slic/i.superpixels.slic.html
Log:
i.superpixels.slic: example: use landsat only from PERMANENT (full NC), use v.vi for \
NDVI, typo
Modified: grass-addons/grass7/imagery/i.superpixels.slic/i.superpixels.slic.html
===================================================================
--- grass-addons/grass7/imagery/i.superpixels.slic/i.superpixels.slic.html 2017-07-22 \
11:01:21 UTC (rev 71292)
+++ grass-addons/grass7/imagery/i.superpixels.slic/i.superpixels.slic.html 2017-07-22 \
11:34:36 UTC (rev 71293) @@ -124,7 +124,7 @@
List Landsat imagery in the full NC sample dataset:
<div class="code"><pre>
-g.list type=raster pattern='lsat*' sep=comma
+g.list type=raster pattern='lsat*' sep=comma mapset=PERMANENT
</pre></div>
Set the computation region to one of the rasters (all have the same
@@ -137,7 +137,7 @@
Use the list to create an imagery group:
<div class="code"><pre>
-i.group group=lsat subgroup=lsat input=`g.list type=raster pattern='lsat*' \
sep=comma` +i.group group=lsat subgroup=lsat input=`g.list type=raster \
pattern='lsat*' sep=comma mapset=PERMANENT` </pre></div>
Perform the segmentation:
@@ -164,8 +164,7 @@
and assign average NDVI to each of the vector areas:
<div class="code"><pre>
-r.mapcalc "ndvi = float(lsat7_2002_40 - lsat7_2002_30) / float(lsat7_2002_40 + \
lsat7_2002_30)"
-r.colors map=ndvi color=ndvi
+i.vi red=lsat7_2002_30 nir=lsat7_2002_40 viname=ndvi output=ndvi
v.rast.stats map=segments raster=ndvi column_prefix=ndvi method=average
</pre></div>
@@ -182,7 +181,7 @@
<center>
<img src="i_superpixels_slic.png" alt="Average NDVI in superpixel">
-<p><em>Average NVDI in each superpixel area (segment)</em>
+<p><em>Average NDVI in each superpixel area (segment)</em>
</center>
<h2>REFERENCES</h2>
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