<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0121-1129</journal-id>
<journal-title><![CDATA[Revista Facultad de Ingeniería]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. ing.]]></abbrev-journal-title>
<issn>0121-1129</issn>
<publisher>
<publisher-name><![CDATA[Universidad Pedagógica y Tecnológica de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-11292017000200149</article-id>
<article-id pub-id-type="doi">10.19053/01211129.v26.n45.2017.6423</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Changes in soil cover in Nechí, Antioquia: An approach to the environmental impact of mining, 1986-2010]]></article-title>
<article-title xml:lang="es"><![CDATA[Cambios en la cobertura del suelo en el municipio de Nechí: Una aproximación al impacto ambiental de la minería, 1986-2010]]></article-title>
<article-title xml:lang="pt"><![CDATA[Mudanças na cobertura do solo no município de Nechí: Uma aproximação ao impacto ambiental da mineração, 1986-2010]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Rodríguez]]></surname>
<given-names><![CDATA[Michael Ezequiel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molina-Pérez]]></surname>
<given-names><![CDATA[Francisco José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Agudelo-Echavarría]]></surname>
<given-names><![CDATA[Diana María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cañón-Barriga]]></surname>
<given-names><![CDATA[Julio Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vélez-Macías]]></surname>
<given-names><![CDATA[Fabio de Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<volume>26</volume>
<numero>45</numero>
<fpage>149</fpage>
<lpage>163</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-11292017000200149&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-11292017000200149&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-11292017000200149&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The municipality of Nechí (Antioquia, Colombia) has a long mining history associated with the extraction of gold. This paper evaluates the evolution of land cover changes caused by this mining activity over 24 years. The spatial analysis was based on the Normalized Difference Vegetation Index (NDVI) of three LANDSAT images (1986, 1996 and 2010). The difference in NDVI values between 1986 and 2010 were used to determine the actual state of vegetation, the direction of change (improvement, stability or deterioration), and the area associated with each soil cover. Polygons for different types of coverage (forest, pasture, bare soil, and water bodies) were extracted from each satellite image to quantify the changes and develop land cover maps for each year. Results show that almost 124.8 km2 of forest have been lost during the analyzed period. By contrast, water bodies gained an area of 66.3 km2. Both results may be related to the type of gold exploitation in the region.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El municipio de Nechí (Antioquia, Colombia) es una zona influenciada por la minería aurífera desde épocas prehispánicas. En este artículo se evalúa la evolución de los cambios de cobertura del suelo producidos por la minería aurífera durante 24 años. El análisis espacial de cada imagen fue basado, principalmente, en el cálculo del Índice de Vegetación de Diferencias Normalizada (NDVI) de tres imágenes LANDSAT de los años 1986, 1996 y 2010. Adicionalmente, se calculó la Diferencia de NDVI entre los dos años extremos, con el fin de analizar el estado actual de la vegetación; la dirección de su cambio, es decir, si hubo mejoría, estabilidad o deterioro, y cuantificar la extensión asociada con cada cubierta del suelo. Se extrajeron polígonos para los diferentes tipos de coberturas de cada imagen satelital (bosques, pastos, suelo desnudo y cuerpos de agua), para cuantificar los cambios y elaborar los mapas de cobertura del suelo para cada año. Los resultados muestran que casi 124,8 km2 de bosque se han perdido en el período analizado; por el contrario, los cuerpos de agua ganaron un área de 66,3 km2; ambos resultados pueden estar relacionados principalmente con el tipo de explotación del oro en la región.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo O município de Nechí (Antioquia, Colômbia) é uma região influenciada pela mineração aurífera desde épocas pré-hispânicas. Neste artigo avalia-se a evolução das mudanças de cobertura do solo produzidas pela mineração aurífera durante 24 anos. A análise espacial de cada imagem foi baseada, principalmente, no cálculo do Índice de Vegetação de Diferenças Normalizado (NDVI) de três imagens LANDSAT dos anos 1986, 1996 e 2010. Adicionalmente, calculou-se a Diferença de NDVI entre os dois anos extremos, com o fim de analisar o estado atual da vegetação, a direção de sua mudança, ou seja, se houve melhoria, estabilidade ou deterioro, e quantificar a extensão associada com cada camada do solo. Extraíram-se polígonos para os diferentes tipos de coberturas de cada imagem de satélite (bosques, pastos, solo desnudo e corpos de água), para quantificar as mudanças e elaborar os mapas de cobertura do solo para cada ano. Os resultados mostram que quase 124,8 km2 de bosque têm se perdido no período analisado; pelo contrário, os corpos de água ganharam uma área de 66,3 km2; ambos os resultados podem estar relacionados principalmente com o tipo de exploração de ouro na região.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[GIS]]></kwd>
<kwd lng="en"><![CDATA[Landsat]]></kwd>
<kwd lng="en"><![CDATA[Mining]]></kwd>
<kwd lng="en"><![CDATA[NDVI]]></kwd>
<kwd lng="en"><![CDATA[Soil cover]]></kwd>
<kwd lng="es"><![CDATA[Cobertura del suelo]]></kwd>
<kwd lng="es"><![CDATA[Minería]]></kwd>
<kwd lng="es"><![CDATA[NDVI]]></kwd>
<kwd lng="es"><![CDATA[Landsat]]></kwd>
<kwd lng="es"><![CDATA[SIG]]></kwd>
<kwd lng="pt"><![CDATA[Cobertura do solo]]></kwd>
<kwd lng="pt"><![CDATA[Mineração]]></kwd>
<kwd lng="pt"><![CDATA[NDVI]]></kwd>
<kwd lng="pt"><![CDATA[Landsat]]></kwd>
<kwd lng="pt"><![CDATA[SIG]]></kwd>
</kwd-group>
</article-meta>
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