<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222018000200307</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2018v70n2a3</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Aplicación de fotogrametría digital para el registro de las huellas de dinosaurio de la Formación Cerro del Pueblo (Campaniano tardío), Coahuila, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Use of digital photogrammetry to record dinosaur footprints in the Cerro del Pueblo Formation (late Campanian), Coahuila, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gudiño Maussán]]></surname>
<given-names><![CDATA[José L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[Felisa J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Rivera]]></surname>
<given-names><![CDATA[René]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Posgrado en Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Antropología e Historia Centro INAH Coahuila ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>70</volume>
<numero>2</numero>
<fpage>307</fpage>
<lpage>324</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222018000200307&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222018000200307&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222018000200307&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En la última década, las técnicas de modelado digital han demostrado ser de gran utilidad para el estudio y preservación de los fósiles, especialmente para las icnitas (huellas) que, por su extensión, importancia patrimonial, turística o estado de conservación, pueden resultar muy difíciles de recolectar o modelar por métodos tradicionales. La Formación Cerro del Pueblo (FCdP) es una unidad geológica del Campaniano (72.5 Ma) ubicada al sureste de Coahuila, México, que destaca por la gran diversidad de organismos fósiles que conserva, principalmente yacimientos con icnitas de dinosaurio, que han sido poco estudiados y desafortunadamente se encuentran en peligro de destrucción debido a la erosión y las actividades humanas. El objetivo de este proyecto fue generar el registro digital de seis yacimientos con huellas de dinosaurio en la FCdP, para corroborar la efectividad de una nueva técnica de bajo costo e impacto nulo a los icnofósiles: Modelado por fotogrametría digital, mediante los programas de acceso libre VisualSFM, Meshlab, CloudCompare y ParaView. Para este propósito, se registraron las huellas de dinosaurio presentes en seis sitios discretos (yacimientos) en la FCdP. Se emplearon 10 cámaras fotográficas de calidad comercial (5 a 10 Mpx) para tomar fotografías de cada localidad. En los sitios con menor superficie y número de huellas (Cantera Rojas, 26 m2 [4 huellas]; Depósito de la Luz, 37.5 m2 [6]; La Rosa, 60 m2 [9] y Las Águilas B, 70 m2 [12]), se realizaron tomas individuales de las icnitas, así como una serie completa a lo largo del yacimiento. Los más grandes (Paso del Oso, 168 m2 [107] y Las Águilas A, 340 m2 [220]) se separaron en secciones para facilitar el registro fotográfico. En total se tomaron 11840 fotografías, de las cuales se emplearon 4960 para generar 72 modelos tridimensionales de malla poligonal texturizados de las seis localidades. Los modelos obtenidos para las localidades más pequeñas presentaron mejor calidad; hay que considerar su extensión más reducida, el registro individual de icnitas y la limpieza relativa de los estratos. Por otro lado, los más grandes perdieron definición al realizarse ajustes que permitieran que el tiempo de procesamiento y los tamaños de archivo fueran viables para los equipos de cómputo con los que se contó. Con este ejercicio, se obtuvieron parámetros de referencia para hacer más eficiente la toma de fotografías útiles para su procesamiento fotogramétrico y, de este modo, mejorar la calidad de los modelos digitales generados en el futuro.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In the last decade, digital modeling techniques have been shown to be very useful in the study of fossils and their preservation, especially with ichnites (footprints) that are very difficult to collect or model by traditional methods, due to deposit characteristics such as size, heritage, touristic importance and conservation status. In Cerro del Pueblo Formation (FCdP), a geological unit of the late Campanian, located in the southeast Coahuila, Mexico, there is a great fossil diversity, mainly dinosaur ichnites, which unfortunately have been little studied and are in danger of destruction, due to the erosion and human activities. The goal of this project was testing the effectiveness of a new and low-cost technique with no impact for the ichnites. The technique consisted of modeling by digital photogrammetry through the open access software VisualSFM, Meshlab, CloudCompare and ParaView. For this purpose, the dinosaur tracks of six different sites (deposits) in FCdP were recorded. Ten commercial quality cameras (5 to 10 Mpx) were used to take photos at each site. At smaller sites with a fewer number of footprints (Cantera Rojas, 26 m2 [4 tracks]; Depósito de la Luz, 37.5 m2 [6]; La Rosa, 60 m2 [9] and Las Águilas B, 70 m2 [12]), individual shots of ichnites were taken. Also, a complete photo series throughout the deposit was taken. Larger sites (Paso del Oso, 168 m2 [107] and Las Águilas A, 340 m2 [220]) were divided into sections to simplify the photographic record. In total, 11840 photographs were taken, 4960 were used to generate 72 three-dimensional textured polygonal mesh models for the six localities. Models from smaller sites had better quality because of their reduced size, the large number of photos taken and good strata contrast. In contrast, models from bigger sites lost definition, especially after certain adjustments made to improve their computer processing. During this exercise, reference parameters were obtained, to increase the effectiveness in photography for photogrammetric processing. We hope in the future to improve the quality of digital models generated.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Icnitas de dinosaurio]]></kwd>
<kwd lng="es"><![CDATA[Cretácico]]></kwd>
<kwd lng="es"><![CDATA[técnicas de registro]]></kwd>
<kwd lng="es"><![CDATA[modelado virtual]]></kwd>
<kwd lng="en"><![CDATA[Dinosaur tracks]]></kwd>
<kwd lng="en"><![CDATA[Cretaceous]]></kwd>
<kwd lng="en"><![CDATA[registry techniques]]></kwd>
<kwd lng="en"><![CDATA[virtual modelling]]></kwd>
</kwd-group>
</article-meta>
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