[GRASS-SVN] r32699 - in grass/branches/develbranch_6/raster:
r.cross r.slope.aspect
svn_grass at osgeo.org
svn_grass at osgeo.org
Mon Aug 11 23:34:29 EDT 2008
Author: hamish
Date: 2008-08-11 23:34:28 -0400 (Mon, 11 Aug 2008)
New Revision: 32699
Modified:
grass/branches/develbranch_6/raster/r.cross/description.html
grass/branches/develbranch_6/raster/r.slope.aspect/description.html
Log:
html fixes
Modified: grass/branches/develbranch_6/raster/r.cross/description.html
===================================================================
--- grass/branches/develbranch_6/raster/r.cross/description.html 2008-08-12 01:23:00 UTC (rev 32698)
+++ grass/branches/develbranch_6/raster/r.cross/description.html 2008-08-12 03:34:28 UTC (rev 32699)
@@ -2,7 +2,7 @@
<em>r.cross</em> creates an <em>output</em> raster map layer representing
all unique combinations of category values in the raster input layers
-(input=</b><em>name,name,name</em>, ...). At least two, but not more than
+(<b>input=</b><em>name,name,name</em>, ...). At least two, but not more than
ten, <em>input</em> map layers must be specified. The user must also
specify a name to be assigned to the <em>output</em> raster map layer
created by <em>r.cross</em>.
@@ -39,7 +39,7 @@
For example, suppose that, using two raster map layers,
the following combinations occur:
-<pre>
+<div class="code"><pre>
map1 map2
___________
0 1
@@ -47,12 +47,12 @@
1 1
1 2
2 4
-</pre>
+</pre></div>
<em>r.cross</em> would produce a new raster map layer with 5 categories:
-<pre>
+<div class="code"><pre>
map1 map2 output
____________________
0 1 1
@@ -60,7 +60,7 @@
1 1 3
1 2 4
2 4 5
-</pre>
+</pre></div>
Note: The actual category value assigned to a particular combination
in the <em>result</em> map layer is
@@ -76,7 +76,7 @@
each category.
In the above example, the category labels would be:
-<pre>
+<div class="code"><pre>
category category
value label
______________________________
@@ -85,7 +85,7 @@
3 layer1(1) layer2(1)
4 layer1(1) layer2(2)
5 layer1(2) layer2(4)
-</pre>
+</pre></div>
A random color table is also generated for the <em>output</em> map layer.
@@ -105,4 +105,5 @@
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
-<p><i>Last changed: $Date$</i>
+<p>
+<i>Last changed: $Date$</i>
Modified: grass/branches/develbranch_6/raster/r.slope.aspect/description.html
===================================================================
--- grass/branches/develbranch_6/raster/r.slope.aspect/description.html 2008-08-12 01:23:00 UTC (rev 32698)
+++ grass/branches/develbranch_6/raster/r.slope.aspect/description.html 2008-08-12 03:34:28 UTC (rev 32699)
@@ -30,12 +30,13 @@
steepest slope and in the direction of the contour tangent respectively. The
curvatures are expressed as 1/metres, e.g. a curvature of 0.05 corresponds to a
radius of curvature of 20m.
+
<p>
<table width="100%" border="0">
<tr valign="baseline">
<td>
<div align="center">
- <img src="dem.png" border="1"></a>
+ <img src="dem.png" border="1">
<P>
Example DEM
<BR><BR>
@@ -48,7 +49,7 @@
<tr valign="baseline">
<td>
<div align="center">
- <img src="slope.png" border="1"></a>
+ <img src="slope.png" border="1">
<P>
Slope (degree) from example DEM
<BR><BR>
@@ -56,7 +57,7 @@
</td>
<td>
<div align="center">
- <img src="aspect.png" border="1"></a>
+ <img src="aspect.png" border="1">
<P>
Aspect (degree) from example DEM
<BR><BR>
@@ -67,7 +68,7 @@
<tr valign="baseline">
<td>
<div align="center">
- <img src="tcurv.png" border="1"></a>
+ <img src="tcurv.png" border="1">
<P>
Tangential curvature (m<sup>-1</sup>) from example DEM
<BR><BR>
@@ -75,7 +76,7 @@
</td>
<td>
<div align="center">
- <img src="pcurv.png" border="1"></a>
+ <img src="pcurv.png" border="1">
<P>
Profile curvature (m<sup>-1</sup>) from example DEM
<BR><BR>
@@ -91,30 +92,30 @@
of slope that groups slope values into ranges of slope. This can be done using
<i><a href="r.reclass.html">r.reclass</a></i>. An example of a useful
reclassification is given below:
-<pre> category range category labels
- (in degrees) (in percent)
+<div class="code"><pre> category range category labels
+ (in degrees) (in percent)
- 1 0- 1 0- 2%
- 2 2- 3 3- 5%
- 3 4- 5 6- 10%
- 4 6- 8 11- 15%
- 5 9- 11 16- 20%
- 6 12- 14 21- 25%
- 7 15- 90 26% and higher
+ 1 0- 1 0- 2%
+ 2 2- 3 3- 5%
+ 3 4- 5 6- 10%
+ 4 6- 8 11- 15%
+ 5 9- 11 16- 20%
+ 6 12- 14 21- 25%
+ 7 15- 90 26% and higher
- The following color table works well with the above
- reclassification.
+ The following color table works well with the above
+ reclassification.
- category red green blue
+ category red green blue
- 0 179 179 179
- 1 0 102 0
- 2 0 153 0
- 3 128 153 0
- 4 204 179 0
- 5 128 51 51
- 6 255 0 0
- 7 0 0 0</pre>
+ 0 179 179 179
+ 1 0 102 0
+ 2 0 153 0
+ 3 128 153 0
+ 4 204 179 0
+ 5 128 51 51
+ 6 255 0 0
+ 7 0 0 0</pre></div>
<h2>NOTES</h2>
@@ -126,22 +127,27 @@
cells in the elevation map. If the user really wants the elevation map
resampled to the current region resolution, the -a flag should be specified.
-<p>The current mask is ignored.
+<p>
+The current mask is ignored.
-<p>The algorithm used to determine slope and aspect uses a 3x3 neighborhood
+<p>
+The algorithm used to determine slope and aspect uses a 3x3 neighborhood
around each cell in the elevation file. Thus, it is not possible to determine
slope and aspect for the cells adjacent to the edges in the elevation map
layer. These cells are assigned a "zero slope" value (category 0) in both
the slope and aspect raster map layers.
-<p>Horn's formula is used to find the derivatives in x and y directions.
+<p>
+Horn's formula is used to find the derivatives in x and y directions.
-<p>Only when using integer elevation models, the aspect is biased in 0,
+<p>
+Only when using integer elevation models, the aspect is biased in 0,
45, 90, 180, 225, 270, 315, and 360 directions; i.e., the distribution
of aspect categories is very uneven, with peaks at 0, 45,..., 360 categories.
When working with floating point elevation models, no such aspect bias occurs.
-<p>Because most cells with a very small slope end up having category 0,
+<p>
+Because most cells with a very small slope end up having category 0,
45, ..., 360, it is sometimes possible to reduce the bias in these directions
by filtering out the aspect in areas where the terrain is almost flat. A new
option <i>min_slp_allowed</i> was added to specify the minimum slope for which
@@ -150,6 +156,7 @@
<h2>REFERENCE</h2>
+
Horn, B. K. P. (1981). Hill Shading and the Reflectance Map, Proceedings
of the IEEE, 69(1):14-47.
@@ -160,7 +167,8 @@
<em><a href="r.rescale.html">r.rescale</a></em>
<h2>AUTHORS</h2>
-Michael Shapiro, U.S.Army Construction Engineering Research Laboratory
-<p>Olga Waupotitsch, U.S.Army Construction Engineering Research Laboratory
+Michael Shapiro, U.S.Army Construction Engineering Research Laboratory<BR>
+Olga Waupotitsch, U.S.Army Construction Engineering Research Laboratory
-<p><i>Last changed: $Date$</i>
+<p>
+<i>Last changed: $Date$</i>
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