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<H2>DESCRIPTION</H2>
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-<EM>i.photo.rectify</EM> rectifies an image by using the image to photo
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-coordinate transformation matrix created by <A HREF="i.photo.2image.html">i.photo.2image</A>
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-and the rectification parameters created by <A HREF="i.photo.2target.html">i.photo.2target</A>.
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+<em>i.photo.rectify</em> rectifies an image by using the image to photo
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+coordinate transformation matrix created by <a href="i.photo.2image.html">i.photo.2image</a>
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+and the rectification parameters created by <a href="i.photo.2target.html">i.photo.2target</a>.
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Rectification is the process by which the geometry of an image is made
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planimetric. This is accomplished by mapping an image from one coordinate
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-system to another. In <EM>i.photo.rectify</EM> the parameters computed by
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-<A HREF="i.photo.2image.html">i.photo.2image</A> and
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-<A HREF="i.photo.2target.html">i.photo.2target</A> are used in equations to
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+system to another. In <em>i.photo.rectify</em> the parameters computed by
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+<a href="i.photo.2image.html">i.photo.2image</a> and
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+<a href="i.photo.2target.html">i.photo.2target</a> are used in equations to
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convert x,y image coordinates to standard map coordinates for each pixel in
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the image. The result is an image with a standard map coordinate system,
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compensated for relief distortions and photographic tilt. Upon completion of
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the program the rectified image is deposited in a previously targeted GRASS
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LOCATION.
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-<P>
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+<p>
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Images can be resampled with various different interpolation methods:
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nearest neighbor assignment, bilinear and bicubic interpolation. The
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bilinear and bicubic interpolation methods are also available with a
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fallback option. These methods "fall back" to simpler interpolation
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methods along NULL borders. That is, from bicubic to bilinear to nearest.
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-<P>
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+<p>
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The process may take an hour or more depending on the size of the image,
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the speed of the computer, the number files, and the size and resolution
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of the selected window.
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-<P>
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+<p>
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The rectified image will be located in the target LOCATION when the program
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is completed. The original unrectified files are not modified or removed.
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-<P>
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+<p>
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The optional <em>angle</em> output holds the camera angle in degrees to
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the local surface, considering local slope and aspect. A value of 90
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degrees indicates that the camera angle was orthogonal to the local
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@@ -37,46 +37,46 @@ degrees indicate problem areas where the orthorectified output will
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appear blurred. Because terrain shadowing effects are not considered,
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areas with high camera angles may also appear blurred if they are located
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(viewed from the camera position) behind mountain ridges or peaks.
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-<P>
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-<EM>i.photo.rectify</EM> can be run directly, specifying options in the
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+<p>
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+<em>i.photo.rectify</em> can be run directly, specifying options in the
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command line or the GUI, or it can be invoked as OPTION 8 through
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-<A HREF="i.ortho.photo.html">i.ortho.photo</A>. If invoked though
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-<A HREF="i.ortho.photo.html">i.ortho.photo</A>, an interactive terminal
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+<a href="i.ortho.photo.html">i.ortho.photo</a>. If invoked though
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+<a href="i.ortho.photo.html">i.ortho.photo</a>, an interactive terminal
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is used to determine the options.
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<H4>Interactive mode</H4>
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-<P> You are first asked if all images within the imagery group should
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+<p> You are first asked if all images within the imagery group should
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be rectified. If this option is not chosen, you are asked to specify for
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each image within the imagery group whether it should be rectified or not.
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-<P>
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+<p>
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More than one file may be rectified at a time. Each file
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should have a unique output file name. The next prompt asks you for an
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extension to be appended to the rectified images.
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-<P>
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+<p>
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The next prompt will ask you whether a camera angle map should be
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produced and if yes, what should be its name.
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-<P>
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+<p>
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After that you are asked if overwriting existing maps in the target
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location and mapset should be allowed.
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-<P>
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+<p>
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The next prompt asks you to select one of two windows:
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-<P>
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-<PRE>
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+<p>
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+<pre>
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Please select one of the following options
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1. Use the current window in the target location
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2. Determine the smallest window which covers the image
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>
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-</PRE>
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-<P>
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+</pre>
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+<p>
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If you choose option 2, you can also specify a desired target resolution.
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-<P>
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-<EM>i.photo.rectify</EM> will only rectify that portion of the
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+<p>
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+<em>i.photo.rectify</em> will only rectify that portion of the
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image that occurs within the chosen window. Only that portion will be
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relocated in the target database. It is therefore important to check the
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current window in the target LOCATION if choice number one is selected.
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-<P>
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+<p>
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Next you are asked to select an interpolation method.
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-<PRE>
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+<pre>
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Please select one of the following interpolation methods
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1. nearest neighbor
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2. bilinear
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@@ -84,21 +84,21 @@ Next you are asked to select an interpolation method.
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4. bilinear with fallback
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5. bicubic with fallback
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>
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-</PRE>
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-<P>
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+</pre>
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+<p>
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The last prompt will ask you about the amount of memory to be used by
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-<EM>i.photo.rectify</EM>.
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+<em>i.photo.rectify</em>.
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<H2>SEE ALSO</H2>
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-<EM>
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-<A HREF="i.ortho.photo.html">i.ortho.photo</A><br>
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-<A HREF="i.photo.camera.html">i.photo.camera</A><br>
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-<A HREF="i.photo.2image.html">i.photo.2image</A><br>
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-<A HREF="i.photo.2target.html">i.photo.2target</A><br>
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-<A HREF="i.photo.init.html">i.photo.init</A><br>
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-<A HREF="i.rectify.html">i.rectify</A><br>
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-</EM>
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+<em>
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+<a href="i.ortho.photo.html">i.ortho.photo</a><br>
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+<a href="i.ortho.camera.html">i.ortho.camera</a><br>
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+<a href="i.photo.2image.html">i.photo.2image</a><br>
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+<a href="i.photo.2target.html">i.photo.2target</a><br>
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+<a href="i.ortho.init.html">i.ortho.init</a><br>
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+<a href="i.rectify.html">i.rectify</a>
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+</em>
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<H2>AUTHOR</H2>
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