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Bibliographic Details
Main Author:	Symone Maria de Melo Figueiredo
Format:	Artículo científico
Language:	pt
Published:	Universidade Federal de Lavras 2006
Subjects:	Agrociencias NDVI mineração de dados Classificação digital de imagens modelo linear de mistura espectral
Online Access:	https://www.redalyc.org/articulo.oa?id=74412105
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Avaliação da exatidão do mapeamento da cobertura da terra em Capixaba, Acre, utilizando classificação por árvore de decisão Symone Maria de Melo Figueiredo Luis Marcelo Tavares de Carvalho Agrociencias NDVI mineração de dados Classificação digital de imagens modelo linear de mistura espectral Objetivou-se com este estudo avaliar a exatidão do mapeamento da cobertura da terra em Capixaba, Estado do Acre, por meioda classificação digital de imagens por meio do algoritmo árvore de decisão. Foram usados na construção e no uso da árvore de decisãoonze atributos: dados provenientes das bandas 1, 2, 3, 4, 5 e 7 do sensor TM do satélite Landsat 5; imagens fração solo, sombra, vegetaçãoe de erro, geradas pelo modelo linear de mistura espectral, e índice de vegetação por diferença normalizada (NDVI). O resultado domapeamento foi considerado excelente segundo os conceitos estabelecidos por Landis & Koch (1977), com valores do coeficiente deconcordância Kappa acima de 0,83, demonstrando ser uma técnica promissora no mapeamento de classes de cobertura da terra. 2006 artículo científico 0104-7760 https://www.redalyc.org/articulo.oa?id=74412105 pt http://www.redalyc.org/revista.oa?id=744 CERNE application/pdf Universidade Federal de Lavras CERNE (Brasil) Num.1 Vol.12

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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