diff options
Diffstat (limited to 'ds9/doc/ref/contour.html')
| -rw-r--r-- | ds9/doc/ref/contour.html | 299 |
1 files changed, 112 insertions, 187 deletions
diff --git a/ds9/doc/ref/contour.html b/ds9/doc/ref/contour.html index 25dc20d..6d85056 100644 --- a/ds9/doc/ref/contour.html +++ b/ds9/doc/ref/contour.html @@ -1,189 +1,114 @@ -<!DOCTYPE doctype PUBLIC "-//w3c//dtd html 4.0 transitional//en"> +<!DOCTYPE doctype PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> - <head> - <meta http-equiv="Content-Type" content="text/html; - charset=windows-1252"> - <meta name="GENERATOR" content="Mozilla/4.78 [en] (X11; U; Linux - 2.4.7-10 i686) [Netscape]"> - <title>Contours</title> - </head> - <body link="#0000ee" alink="#ff0000" bgcolor="#ffffff" text="#000000" - vlink="#551a8b"> - <h3><img alt="" src="../sun.gif" height="98" align="middle" - width="100"> Contours</h3> - <blockquote> - <p>DS9 can create and display contours as an overlay on an image. - The Analysis Contours menu is used to display contours. To - create, copy, paste, and configure contours, use the - Analysis Contour Parameters menu.</p> - <p><b>Contour Parameters </b></p> - <p>When creating a new contour, a dialog box appears, in which the - user selects the number of contour levels, smoothness, and the - distribution of the contours. </p> - <p><b> Contour Levels</b></p> - <p>Specifies the number of contour levels to be generated. A - typical number is between 1 and 10. Note: large numbers of - contours can take a long time to generate. </p> - <p><b> Contour Smoothness</b></p> - <p>Specifies how smooth the contours are. A smoothness level of 1 - will evaluate the contour at each image pixel. A level of 2 will - evaluate the contour at every other pixel. The larger the - number, the quicker the contour will be generated, and the less - detail will be available. </p> - <p><b> Contour Scale</b></p> - <p>Specifies the distribution of the contour levels. <br> - </p> - <p><b> Contour Method</b></p> - <p>There are two methods that are available to calculate the - contour lines. The first, BLOCK, blocks down the image, by the - smoothness factor, before contours are calculated. As a result, - the larger the smoothness, the faster the result. The second - method, SMOOTH, smooths the image before calculating contours. - As a result, the larger the smoothness, the slower the result.<br> - </p> - <p><b> <a name="ContourFiles"></a>Contour Files</b></p> - <p>A contour file is an ASCII file containing a header, global - properties, coordinate system, contour levels, and contour - points. <br> - </p> - <blockquote> - <p><b> Header</b></p> - <p>A DS9 contour file may start with the following optional - header: </p> - <blockquote> <tt># Contour file format: DS9 version 7.5<br> - </tt></blockquote> - <p><b> Global Properties</b></p> - <p>Global properties affect all contour levels unless a line - level attribute is specified. The <tt>global</tt> keyword is - first, followed by a list of keyword = value pairs. Multiple - global property lines may be used within a region file. </p> - <blockquote> <tt>global color=green width=1 dash=1 dashlist=8 3<br> - </tt></blockquote> - <p><b> Coordinate Systems</b></p> - <p>For each contour file, it is important to specify the - coordinate system used to interpret the contour points, i.e., - to set the context in which the positions are interpreted. For - this purpose, the following keywords are recognized: </p> - <blockquote> <tt>PHYSICAL - -# - - - - - - - - - pixel coords of original file using LTM/LTV</tt> <br> - <tt>IMAGE - -# - - - - - - - - - pixel coords of current file</tt> <br> - <tt><tt><tt>FK4,B1950 - - # sky coordinate systems</tt> <br> - FK5,J2000 -# - - - - - - - - - sky coordinate systems</tt> <br> - </tt><tt><tt><tt>ICRS - -# - sky coordinate systems</tt> <br> - </tt>GALACTIC - -# - - - - - - - - - sky coordinate systems</tt> <br> - <tt>ECLIPTIC - -# - - - - - - - - - sky coordinate systems</tt> <br> - <tt>WCS - - # primary WCS<br> - </tt><tt>WCSA - # - secondary WCS<br> - </tt><tt>LINEAR - -# - - - - - - - - - linear primary WCS</tt> <tt><br> - </tt></blockquote> - </blockquote> - <blockquote> - <p><b> Contour Level</b></p> - <p>Each contour level is composed of a line value, line - attributes and one or more contours. Line attributes are - specified at the start of a new level and only affect contours - within that level . </p> - <blockquote> <tt>level=15.78775 color=pink width=2 dash=yes dashlist=2 - 2<br> - </tt></blockquote> - <p><b> Contour</b></p> - <p>Each contour is composed of one or more X,Y coordinates, with - a deliminator of space or comma, starting with "(" and - ending with ")". Contours are not closed.<br> - </p> - </blockquote> - <blockquote> - <blockquote><tt>(</tt><tt>202.4836468 47.22380226</tt><tt><br> - </tt><tt> 202.4833538 47.2239185</tt><tt><br> - </tt><tt> 202.4831634 47.22409874</tt><tt><br> - </tt><tt> 202.4829883 47.22428858</tt><tt>)</tt><br> - </blockquote> - </blockquote> - <blockquote> - <p><br> - </p> - <blockquote> </blockquote> - </blockquote> - <p><br> - </p> - <blockquote> - <blockquote> </blockquote> - <blockquote> </blockquote> - <blockquote> </blockquote> - </blockquote> - </blockquote> - </body> +<head> +<meta name="generator" content= +"HTML Tidy for Mac OS X (vers 31 October 2006 - Apple Inc. build 15.18.1), see www.w3.org"> +<meta http-equiv="Content-Type" content= +"text/html; charset=us-ascii"> +<meta name="GENERATOR" content= +"Mozilla/4.78 [en] (X11; U; Linux 2.4.7-10 i686) [Netscape]"> +<title>Contours</title> +</head> +<body link="#0000EE" alink="#FF0000" bgcolor="#FFFFFF" text= +"#000000" vlink="#551A8B"> +<h3><img alt="" src="../sun.gif" height="98" align="middle" width= +"100"> Contours</h3> +<blockquote> +<p>DS9 can create and display contours as an overlay on an image. +The Analysis Contours menu is used to display contours. To create, +copy, paste, and configure contours, use the Analysis Contour +Parameters menu.</p> +<p><b>Contour Parameters</b></p> +<p>When creating a new contour, a dialog box appears, in which the +user selects the number of contour levels, smoothness, and the +distribution of the contours.</p> +<p><b>Contour Levels</b></p> +<p>Specifies the number of contour levels to be generated. A +typical number is between 1 and 10. Note: large numbers of contours +can take a long time to generate.</p> +<p><b>Contour Smoothness</b></p> +<p>Specifies how smooth the contours are. A smoothness level of 1 +will evaluate the contour at each image pixel. A level of 2 will +evaluate the contour at every other pixel. The larger the number, +the quicker the contour will be generated, and the less detail will +be available.</p> +<p><b>Contour Scale</b></p> +<p>Specifies the distribution of the contour levels.<br></p> +<p><b>Contour Method</b></p> +<p>There are two methods that are available to calculate the +contour lines. The first, BLOCK, blocks down the image, by the +smoothness factor, before contours are calculated. As a result, the +larger the smoothness, the faster the result. The second method, +SMOOTH, smooths the image before calculating contours. As a result, +the larger the smoothness, the slower the result.<br></p> +<p><b><a name="ContourFiles" id="ContourFiles"></a>Contour +Files</b></p> +<p>A contour file is an ASCII file containing a header, global +properties, coordinate system, contour levels, and contour +points.<br></p> +<blockquote> +<p><b>Header</b></p> +<p>A DS9 contour file may start with the following optional +header:</p> +<blockquote><tt># Contour file format: DS9 version +7.5<br></tt></blockquote> +<p><b>Global Properties</b></p> +<p>Global properties affect all contour levels unless a line level +attribute is specified. The <tt>global</tt> keyword is first, +followed by a list of keyword = value pairs. Multiple global +property lines may be used within a region file.</p> +<blockquote><tt>global color=green width=1 dash=1 dashlist=8 +3<br></tt></blockquote> +<p><b>Coordinate Systems</b></p> +<p>For each contour file, it is important to specify the coordinate +system used to interpret the contour points, i.e., to set the +context in which the positions are interpreted. For this purpose, +the following keywords are recognized:</p> +<blockquote> +<tt>PHYSICAL +# pixel coords of original file using LTM/LTV</tt><br> +<tt>IMAGE +# pixel coords of current file</tt><br> +<tt><tt><tt>FK4,B1950 + # sky coordinate systems</tt><br> +FK5,J2000 +# sky coordinate systems</tt><br></tt> +<tt><tt><tt>ICRS +# sky coordinate systems</tt><br></tt> +GALACTIC +# sky coordinate systems</tt><br> +<tt>ECLIPTIC +# sky coordinate systems</tt><br> +<tt>WCS + # primary WCS<br></tt> +<tt>WCSA + # secondary WCS<br></tt> +<tt>LINEAR +# linear primary WCS</tt> <tt><br></tt></blockquote> +</blockquote> +<blockquote> +<p><b>Contour Level</b></p> +<p>Each contour level is composed of a line value, line attributes +and one or more contours. Line attributes are specified at the +start of a new level and only affect contours within that level +.</p> +<blockquote><tt>level=15.78775 color=pink width=2 dash=yes +dashlist=2 2<br></tt></blockquote> +<p><b>Contour</b></p> +<p>Each contour is composed of one or more X,Y coordinates, with a +deliminator of space or comma, starting with "(" and ending +with ")". Contours are not closed.<br></p> +</blockquote> +<blockquote> +<blockquote><tt>(</tt><tt>202.4836468 47.22380226</tt><tt><br></tt> +<tt> 202.4833538 47.2239185</tt><tt><br></tt> +<tt> 202.4831634 47.22409874</tt><tt><br></tt> +<tt> 202.4829883 47.22428858</tt><tt>)</tt><br></blockquote> +</blockquote> +<blockquote> +<p><br></p> +</blockquote> +<p><br></p> +</blockquote> +</body> </html> |