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<title>Open Visualization Data Explorer: Topo</title>
</head>
<body bgcolor="white">
<p>
This visual program shows some ways to
visualize topographic data.
It imports a data set which describes the elevation of a
region of Colorado and a satellite photograph of the same region.
<p>
<blockquote>
<center>
<b>Grey Scale Image / Elevation Data</b>
<br>
<img src="Topo.gif">
</center>
</blockquote>
<p>
The elevation data are assigned colors by height. (Red and blue
correspond to peaks and valleys.) The visualization task is to
create a realistic view of the surface by combining the photograph
with the elevation data.
<p>
<table border = 2>
<tr bgcolor="black">
<td>
<applet
code="imageWindow.class" width = 394 height = 317
codebase=../
archive=htmlpages/dx.jar,htmlpages/samples.jar
MAYSCRIPT=true
>
<param name=INITIAL_IMAGE value="htmlpages/Topo2.0.0.gif">
<param name=IMAGE_NODE value="Image_2">
</applet>
</td>
<td>
<applet
code="imageWindow.class" width = 394 height = 317
codebase=../
archive=htmlpages/dx.jar,htmlpages/samples.jar
MAYSCRIPT=true
>
<param name=INITIAL_IMAGE value="htmlpages/Topo4.0.0.gif">
<param name=IMAGE_NODE value="Image_4">
</applet>
</td>
</tr>
</table>
<p>
<center>
<table border = 0>
<tr>
<td>
<h3>...about the visualization</h3>
The image on left shows the satellite image combined with the elevation
data. The image on the right is rubbersheeted elevation data. The 2 images
share a common viewpoint. If you rotate the image on the left, you'll see
the one on the right from the same camera position.
<h3>...about the visual program</h3>
Reorient is used to ensure that the image color data is
assigned to the elevation data in the correct order, as
the original data sets, while on the same grid, do not
have the data in the same order. The "how" parameter of
Reorient was set so that the two small images have the
same orientation; the grey image is the photograph, while
the colored image is the elevation data.
<p>
If the image and elevation data had not been on the same
grid, then instead of Replace we could have used Map to
map the elevation data onto the image field.
<p>
You may specify a reduction factor. This value is used
as input the Reduce tool which reduces the resolution of
the data for better performance. When you're satisfied
with the camera position, you might select a reduction
factor of 0.
</td>
<td>
<applet
code="Topo.class" width = 300 height = 250
codebase=../
archive=htmlpages/dx.jar,htmlpages/samples.jar
MAYSCRIPT=true
>
<param name="name" value="Topo">
<param name=NETNAME value="Topo.net">
<param name=DXUIVERS value="4.1.1">
<param name=BACKGROUND value="[1.0, 1.0, 1.0]">
</applet>
</td>
</tr>
</table>
<p>
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