[GRASS-SVN] r69792 - grass-addons/grass7/raster/r.basin
svn_grass at osgeo.org
svn_grass at osgeo.org
Tue Nov 8 12:24:21 PST 2016
Author: madi
Date: 2016-11-08 12:24:21 -0800 (Tue, 08 Nov 2016)
New Revision: 69792
Modified:
grass-addons/grass7/raster/r.basin/r.basin.html
Log:
closing more tags
Modified: grass-addons/grass7/raster/r.basin/r.basin.html
===================================================================
--- grass-addons/grass7/raster/r.basin/r.basin.html 2016-11-08 18:48:11 UTC (rev 69791)
+++ grass-addons/grass7/raster/r.basin/r.basin.html 2016-11-08 20:24:21 UTC (rev 69792)
@@ -1,123 +1,123 @@
-<h2>DESCRIPTION</h2>
+<h2>DESCRIPTION</h2>
-<em>r.basin</em> generates the main morphometric parameters of the
-basin starting from the digital elevation model and the coordinates
-of the basin's closing section (outlet).
+<em>r.basin</em> generates the main morphometric parameters of the
+basin starting from the digital elevation model and the coordinates
+of the basin's closing section (outlet).
<h3>Important:</h3>
<p>
-<em>r.basin</em> works in projected locations, geographic or
-xy-locations are not supported.
+<em>r.basin</em> works in projected locations, geographic or
+xy-locations are not supported.
</p>
<p>
-The closing section's coordinates must belong to the river network
-generated by <a href="r.stream.extract.html">r.stream.extract</a>.
+The closing section's coordinates must belong to the river network
+generated by <a href="r.stream.extract.html">r.stream.extract</a>.
It is suggested to run it beforehand.
-In G7, r.basin has been improved to take in input coordinates not
-exactly belonging to the river network (but not too far from it).
-It basically snaps to the closest point belonging to the network.
-This feature is experimental and might not produce the expected result.
-To check if the snapped outlet is acceptable, at the end of the
-computation, two outlet vector maps are produced: the one with the
-coordinates inserted by the user and the snapped one. If the user is
-not happy with this latter, should tweak the coordinates to match with
+In G7, r.basin has been improved to take in input coordinates not
+exactly belonging to the river network (but not too far from it).
+It basically snaps to the closest point belonging to the network.
+This feature is experimental and might not produce the expected result.
+To check if the snapped outlet is acceptable, at the end of the
+computation, two outlet vector maps are produced: the one with the
+coordinates inserted by the user and the snapped one. If the user is
+not happy with this latter, should tweak the coordinates to match with
the river network.
</p>
-<h3>Morphometric parameters of basin</h3>
+<h3>Morphometric parameters of basin</h3>
-The main parameters are:
+The main parameters are:
<ul>
-<li>The coordinates of the vertices of the rectangle containing
-the basin.</li>
-<li>The center of gravity of the basin: the
-coordinates of the pixel nearest to the center of gravity of the
-geometric figure resulting from the projection of the basin on the
-horizontal plane.</li>
-<li>The area of the basin: is the area of a single cell multiplied
+<li>The coordinates of the vertices of the rectangle containing
+the basin.</li>
+<li>The center of gravity of the basin: the
+coordinates of the pixel nearest to the center of gravity of the
+geometric figure resulting from the projection of the basin on the
+horizontal plane.</li>
+<li>The area of the basin: is the area of a single cell multiplied
by the number of cells belonging to the basin.</li>
-<li>The perimeter: is the length of the contour of the figure
+<li>The perimeter: is the length of the contour of the figure
resulting by the projection of the basin on the horizontal plane.</li>
-<li>Characteristic values of elevation: the highest and the
-lowest altitude, the difference between them and the mean elevation
-calculated as the sum of the values of the cells divided by the
-number of the cells.</li>
-<li>The mean slope, calculated averaging the slope map.</li>
-<li>The length of the directing vector: the length of the vector
+<li>Characteristic values of elevation: the highest and the
+lowest altitude, the difference between them and the mean elevation
+calculated as the sum of the values of the cells divided by the
+number of the cells.</li>
+<li>The mean slope, calculated averaging the slope map.</li>
+<li>The length of the directing vector: the length of the vector
linking the outlet to the center of gravity of the basin.</li>
-<li>The prevalent orientation: in GRASS GIS the
-aspect categories represent the number degrees of east and they
-increase counterclockwise: (90deg is North, 180 is West, 270 is
-South 360 is East). The aspect value 0 is used to indicate undefined
-aspect in flat areas with slope=0. We instead calculate the
-orientation as the number of degree from north, increasing
-counterclockwise.</li>
-<li>The length of main channel: is the length
-of the longest succession of segments that connect a source to the
-outlet of the basin.</li>
+<li>The prevalent orientation: in GRASS GIS the
+aspect categories represent the number degrees of east and they
+increase counterclockwise: (90deg is North, 180 is West, 270 is
+South 360 is East). The aspect value 0 is used to indicate undefined
+aspect in flat areas with slope=0. We instead calculate the
+orientation as the number of degree from north, increasing
+counterclockwise.</li>
+<li>The length of main channel: is the length
+of the longest succession of segments that connect a source to the
+outlet of the basin.</li>
<li>The mean slope of main channel: it is calculated as follows
<br>
<center>
<img src="r_basin1.png" border="0" alt="mean slope">
-</center>
+</center>
-<br> where N is the topological diameter, i.e. the number of links
-in which the main channel can be divided on the basis of the
-junctions.</li>
-<li>The circularity ratio: is the ratio between the area of the
-basin and the area of the circle having the same perimeter of the
-basin.</li>
-<li>The elongation ratio: is the ratio between the diameter of the
-circle having the same area of the basin and the length of the main
+<br> where N is the topological diameter, i.e. the number of links
+in which the main channel can be divided on the basis of the
+junctions.</li>
+<li>The circularity ratio: is the ratio between the area of the
+basin and the area of the circle having the same perimeter of the
+basin.</li>
+<li>The elongation ratio: is the ratio between the diameter of the
+circle having the same area of the basin and the length of the main
channel.
-</li>
-<li>The compactness coefficient: is the ratio between the perimeter
-of the basin and the diameter of the circle having the same area of
-the basin.</li>
-<li>The shape factor: is the ratio between the area of the basin and
-the square of the length of the main channel.</li>
+</li>
+<li>The compactness coefficient: is the ratio between the perimeter
+of the basin and the diameter of the circle having the same area of
+the basin.</li>
+<li>The shape factor: is the ratio between the area of the basin and
+the square of the length of the main channel.</li>
<li>The concentration time (Giandotti, 1934):
-<br>
+<br>
<center>
<img src="r_basin2.png" border="0" alt="concentration time">
-</center>
+</center>
-<br> Where A is the area, L the length of the main channel and H the
+<br>Where A is the area, L the length of the main channel and H the
difference between the highest and the lowest elevation of the basin.
</li>
-<li>The mean hillslope length: is the mean of the distances
-calculated along the flow direction of each point non belonging to
+<li>The mean hillslope length: is the mean of the distances
+calculated along the flow direction of each point non belonging to
the river network from the point in which flows into the network.
</li>
-<li>The magnitudo: is the number of the branches of order 1
+<li>The magnitudo: is the number of the branches of order 1
following the Strahler hierarchy.</li>
-<li>The max order: is the order of the basin, following the Strahler
+<li>The max order: is the order of the basin, following the Strahler
hierarchy.</li>
-<li>The number of streams: is the number of the branches of the
+<li>The number of streams: is the number of the branches of the
river network.</li>
-<li>The total stream length: is the sum of the length of every
+<li>The total stream length: is the sum of the length of every
branches.</li>
-<li>The first order stream frequency: is the ratio between the
+<li>The first order stream frequency: is the ratio between the
magnitudo and the area of the basin.</li>
-<li>The drainage density: is the ratio between the total length of
+<li>The drainage density: is the ratio between the total length of
the river network and the area.</li>
<li>The Horton ratios (Horton, 1945; Strahler, 1957).</li>
</ul>
-<h3>Plots</h3>
+<h3>Plots</h3>
<ul>
-<li>The distance-area function, also known as Width Function: in x
+<li>The distance-area function, also known as Width Function: in x
axis is the length and in y axis is the area.</li>
-<li>The hypsographic curve provides the distribution of the areas at
-different altitudes. Each point on the hypsographic curve has on the
-y-axis the altitude and on the x-axis the percentage of basin
+<li>The hypsographic curve provides the distribution of the areas at
+different altitudes. Each point on the hypsographic curve has on the
+y-axis the altitude and on the x-axis the percentage of basin
surface placed above that altitude.</li>
<li>The hypsometric curve has the same shape but is dimensionless.</li>
-</ul>
+</ul>
<h2>EXAMPLE</h2>
@@ -142,9 +142,10 @@
<a href="r_basin_map.png">
<img src="r_basin_map.png" border="0" width="600" alt="r.basin results">
</a>
-</center>
+</center>
+</p>
-<h3>Dependencies</h3>
+<h3>Dependencies</h3>
<ul>
<li>Matplotlib</li>
<li>r.hypso</li>
@@ -159,16 +160,16 @@
<h2>Known issues</h2>
<ul>
-<li> r.basin hasn't been designed for working in lat/long coordinates.
-This means that if you are working in lat/long coordinates, you need to reproject
-your map first in order to apply the tool. </li>
-<li> r.basin is designed to work in meters unit. The values that you get using
-feet are nonsense. </li>
-<li> r.basin does not handle overwrite. You need to delete the output products
-already created (maps, text file, figures) by hand before running it again. </li>
+<li>r.basin hasn't been designed for working in lat/long coordinates.
+This means that if you are working in lat/long coordinates, you need to reproject
+your map first in order to apply the tool.</li>
+<li>r.basin is designed to work in meters unit. The values that you get using
+feet are nonsense.</li>
+<li>r.basin does not handle overwrite. You need to delete the output products
+already created (maps, text file, figures) by hand before running it again.</li>
</ul>
-<h2>SEE ALSO</h2>
+<h2>SEE ALSO</h2>
<em>
<a href="http://grass.osgeo.org/grass70/manuals/addons/r.hypso.html">r.hypso</a> (Addon),
@@ -185,29 +186,31 @@
<a href="http://grass.osgeo.org/grass70/manuals/addons/r.width.funct.html">r.width.funct</a> (Addon)
<p>
Related <a href="https://grasswiki.osgeo.org/wiki/R.basin">Wiki page</a>
-</em>
+</p>
+</em>
-<h2>CITE AS</h2>
+<h2>CITE AS</h2>
-Di Leo Margherita, Di Stefano Massimo (2013) An Open-Source Approach for Catchment's
-Physiographic Characterization, Abstract H52E-06 presented at 2013 Fall Meeting, AGU,
-San Francisco, CA, USA 9-13 Dec.
+Di Leo Margherita, Di Stefano Massimo (2013) An Open-Source Approach for Catchment's
+Physiographic Characterization, Abstract H52E-06 presented at 2013 Fall Meeting, AGU,
+San Francisco, CA, USA 9-13 Dec.
<a href="http://abstractsearch.agu.org/meetings/2013/FM/sections/H/sessions/H52E/abstracts/H52E-06.html">abstract</a>
-<h2>REFERENCES</h2>
+<h2>REFERENCES</h2>
<ul>
-<li><em>Rodriguez-Iturbe I., Rinaldo A. (2001) Fractal River Basins,
+<li><em>Rodriguez-Iturbe I., Rinaldo A. (2001) Fractal River Basins,
Chance and Self-Organization. Cambridge Press </em></li>
-<li><em>In Italian: Di Leo M., Di Stefano M., Claps P., Sole A.
-(2010) Caratterizzazione morfometrica del bacino idrografico in
-GRASS GIS (Morphometric characterization of the catchment in GRASS
-GIS environment), <a href="http://geomatica.como.polimi.it/workbooks/">
+<li><em>In Italian: Di Leo M., Di Stefano M., Claps P., Sole A.
+(2010) Caratterizzazione morfometrica del bacino idrografico in
+GRASS GIS (Morphometric characterization of the catchment in GRASS
+GIS environment), <a href="http://geomatica.como.polimi.it/workbooks/">
Geomatics Workbooks</a>, n. 9</em></li>
</ul>
-<h2>AUTHORS</h2>
+<h2>AUTHORS</h2>
-Margherita Di Leo (dileomargherita AT gmail DOT com), Massimo Di Stefano
+Margherita Di Leo (dileomargherita AT gmail DOT com), Massimo Di Stefano
-<p>
+<p>
<i>Last changed: $Date$</i>
+</p>
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