<?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>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742005000200229</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización litológica de regiones desérticas mediante técnicas de percepción remota: Un ejemplo en la franja costera central de Baja California, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Lithologic characterization of desertic regions using remote sensing techniques: An example in the central coast of Baja California, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Noyola-Medrano]]></surname>
<given-names><![CDATA[María Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hinojosa-Corona]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martín-Barajas]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,CICESE Departamento de Geología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Université de Paris  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Francia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<volume>22</volume>
<numero>2</numero>
<fpage>229</fpage>
<lpage>245</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742005000200229&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742005000200229&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742005000200229&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La utilización de técnicas de combinación de bandas en compuestos a color, análisis de componentes principales, fotointerpretación y clasifi cación supervisada de una imagen Landsat Thematic Mapper (TM), permitió caracterizar la litología de una amplia región desértica en la franja costera del Golfo de California entre Puertecitos y Bahía de San Luis Gonzaga (~100 x 15 km). Esta región contiene una diversidad litológica de rocas metasedimentarias, intrusivos graníticos, rocas volcánicas félsicas a intermedias, y sedimentos marinos y continentales de fuente local. En la fotointerpretación, el compuesto de falso color TM 742 en rojo, verde y azul, respectivamente, resultó la mejor combinación de bandas para la discriminación litológica de las principales unidades volcánicas del Neogéno, y rocas metamórficas y graníticas del basamento cristalino. El análisis selectivo de componentes principales proporcionó una imagen en falso color con las segundas componentes de los pares de bandas TM 5-7, 4-7, y 2-7 en rojo, verde y azul, respectivamente, que mejora el contraste entre las unidades litológicas. Mediante la reclasificación y generalización de una clasificación supervisada se obtuvieron 26 clases litológicas; trece de rocas ígneas, tres de rocas metamórfi cas y diez corresponden a rocas sedimentarias del Plioceno-Cuaternario. Estas últimas se distinguen entre sí por la litología de la fuente y su edad relativa. El mapa litológico resultante de la clasifi cación supervisada se evaluó por los métodos de matriz de confusión e índice Kappa (&#954;). La evaluación resultó en un 79.0% de confi abilidad, con un índice &#954; de 0.733, indicando que este mapa cumple los criterios de evaluación y permite recomendar esta aplicación en estudios geológicos en otras zonas desérticas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The use of band combinations for false color composites, principal component analysis, photo interpretation, and supervised classification techniques of a Landsat Thematic Mapper (TM) image enabled the lithologic characterization of a vast desertic region along the east-central coast of Baja California, México (~100 x 15 km). This region has a diversity of metasedimentary rocks, granitic intrusives, felsic to intermediate volcanic rocks, and continental and marine sedimentary deposits. The TM 742 band combination on a RGB false color composite was the most revealing for lithologic discrimination of the main Neogene volcanic, and Quaternary sedimentary units overlying the metamorphic and granitic basement. An enhanced contrast between lithologic units was produced by the selective principal component analysis using the second components for the TM band pairs 5-7, 4-7 and 2-7 on a RGB false color composite. Through the reassignment and generalization of a supervised classifi cation, we obtained 26 lithologic classes; thirteen Cenozoic volcanic rocks and intrusives, three pre-Cretaceous metamorphic units, and ten Plio-Quaternary sedimentary classes. The latter differ among each other by the source rocks and relative age. The resulting lithologic map of the supervised classifi cation was evaluated using the confusion matrix and Kappa index (&#954;). The map obtained a 79% confi dence level, and &#954; = 0.733, indicating that this map meets the evaluation criteria, and allow to us to recommend this methodology for geologic studies in desert areas.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[geología]]></kwd>
<kwd lng="es"><![CDATA[percepción remota]]></kwd>
<kwd lng="es"><![CDATA[Landsat TM]]></kwd>
<kwd lng="es"><![CDATA[procesamiento de imágenes]]></kwd>
<kwd lng="es"><![CDATA[Baja California]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[geology]]></kwd>
<kwd lng="en"><![CDATA[remote sensing]]></kwd>
<kwd lng="en"><![CDATA[Landsat TM]]></kwd>
<kwd lng="en"><![CDATA[image processing]]></kwd>
<kwd lng="en"><![CDATA[Puertecitos]]></kwd>
<kwd lng="en"><![CDATA[San Luis Gonzaga]]></kwd>
<kwd lng="en"><![CDATA[Baja California]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
</kwd-group>
</article-meta>
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