Photogrammetry</p>
<h1>Image enhancement, filtering and sharpening</h1>
-<img src="jotunheimen-ir-2band.jpeg">
-<img src="jotunheimen-truecolor.jpeg">
-<img src="jotunheimen-std-ir-eq.jpeg">
+<img width="40%" src="jotunheimen-std-ir-eq.jpeg">
<p>By Petter Reinholdtsen and Shanette Dallyn, 2005-05-01.</p>
-<p>This exercuse was performed by logging into jern.uio.no using ssh
-and runnign ERDAS Imagine. Started by using 'imagine' on the command
+<p>This exercise was performed by logging into jern.uio.no using ssh
+and running ERDAS Imagine. Started by using 'imagine' on the command
line. The images were loaded from /mn/geofag/gggruppe-data/geomatikk/
<p>We tried to use svalbard/tm87.img, but it only have 5 bands. We
<h2>Evaluation of the different bands</h2>
+<p><img align="right" width="40%" src="jotunheimen-truecolor.jpeg">
+This image show the "true colour" version, with the blue range
+assigned to the blue colour, green range to green colour and red range
+to red colour.</p>
+
<h3>band 1, blue (0.45-0.52 micrometer - um)</h3>
Visible light, and will display a broad range of values both over
</ul>
+<img align="right" width="40%" src="jotunheimen-ir-2band.jpeg">
<p>Next, we tried to shift the frequencies displayed to use blue for the
red band, green for the near ir band and red for the mid ir (1.55-1.75
um). With this composition, we get some changes in the colours of
different features:
+
<ul>
<li>water is black
<tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
</table></p>
+<p><img align="right" width="40%"src="jotunheimen-therm-unsharp5x5.jpeg">
Next, we tried some different weight:
<p><table align="center">
<tr><td>-1</td><td>-1</td><td>-1</td><td>-1</td><td>-1</td></tr>
</table></p>
-<p><img align="right" width="40%"src="jotunheimen-therm-unsharp5x5.jpeg">
-This one gave more lines showing the borders between the thermal
+<p>This one gave more lines showing the borders between the thermal
pixels.
From: shanette Dallyn <shanette_dallyn@yahoo.ca>
Shanette
+<H2>References</h2>
+
+<ul>
+ <li><a href="http://www.cs.uu.nl/wais/html/na-dir/sci/Satellite-Imagery-FAQ/part3.html">Satellite-Imagery-FAQ</a>
+</ul>
+
<hr>
<address><a href="mailto:pere@hungry.com">Petter Reinholdtsen</a></address>
<!-- Created: Sun May 1 13:25:38 CEST 2005 -->