EVOLUTION-MANAGER
Edit File: boundaries.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: boundaries (edges) detection</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for boundaries {raster}"><tr><td>boundaries {raster}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>boundaries (edges) detection</h2> <h3>Description</h3> <p>Detect boundaries (edges). boundaries are cells that have more than one class in the 4 or 8 cells surrounding it, or, if <code>classes=FALSE</code>, cells with values and cells with <code>NA</code>. </p> <h3>Usage</h3> <pre> ## S4 method for signature 'RasterLayer' boundaries(x, type='inner', classes=FALSE, directions=8, asNA=FALSE, filename="", ...) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>x</code></td> <td> <p>RasterLayer object</p> </td></tr> <tr valign="top"><td><code>type</code></td> <td> <p>character. 'inner' or 'outer'</p> </td></tr> <tr valign="top"><td><code>classes</code></td> <td> <p>character. Logical. If <code>TRUE</code> all different values are (after rounding) distinguished, as well as <code>NA</code>. If <code>FALSE</code> (the default) only edges between <code>NA</code> and non-<code>NA</code> cells are considered</p> </td></tr> <tr valign="top"><td><code>directions</code></td> <td> <p>integer. Which cells are considered adjacent? Should be 8 (Queen's case) or 4 (Rook's case)</p> </td></tr> <tr valign="top"><td><code>asNA</code></td> <td> <p>logical. If <code>TRUE</code>, non-edges are returned as <code>NA</code> instead of zero</p> </td></tr> <tr valign="top"><td><code>filename</code></td> <td> <p>character. Filename for the output RasterLayer (optional)</p> </td></tr> <tr valign="top"><td><code>...</code></td> <td> <p>additional arguments as for <code><a href="writeRaster.html">writeRaster</a></code></p> </td></tr> </table> <h3>Value</h3> <p>RasterLayer. Cell values are either 1 (a border) or 0 (not a border), or <code>NA</code> </p> <h3>See Also</h3> <p><code><a href="focal.html">focal</a></code>, <code><a href="clump.html">clump</a></code> </p> <h3>Examples</h3> <pre> r <- raster(nrow=18, ncol=36, xmn=0) r[150:250] <- 1 r[251:450] <- 2 plot( boundaries(r, type='inner') ) plot( boundaries(r, type='outer') ) plot( boundaries(r, classes=TRUE) ) </pre> <hr /><div style="text-align: center;">[Package <em>raster</em> version 3.3-13 <a href="00Index.html">Index</a>]</div> </body></html>