<?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>0188-4611</journal-id>
<journal-title><![CDATA[Investigaciones geográficas]]></journal-title>
<abbrev-journal-title><![CDATA[Invest. Geog]]></abbrev-journal-title>
<issn>0188-4611</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geografía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-46112025000100109</article-id>
<article-id pub-id-type="doi">10.14350/rig.60914</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Photogrammetry to Assess the Recovery of a Forest: Case Study of Guadalupe Island]]></article-title>
<article-title xml:lang="es"><![CDATA[Fotogrametría para evaluar la recuperación de un bosque: caso de estudio de isla Guadalupe]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vera-Ortega]]></surname>
<given-names><![CDATA[Laura Abigail]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</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[Luna]]></surname>
<given-names><![CDATA[Luciana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada Departamento de Geología ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada Departamento de Geología ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Grupo de Ecología y Conservación de Islas (GECI), A.C.  ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<numero>116</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-46112025000100109&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-46112025000100109&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-46112025000100109&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This study employs photogrammetry to evaluate and monitor the recovery of the cypress forest on Guadalupe Island, Mexico, an ecosystem significantly impacted by fires and overgrazing. Two drone surveys were conducted over the forest area during the summers of 2016 and 2019 using natural color (RGB) and near-infrared (NIR) cameras. This work presents the first complete 3D reconstruction of the cypress forest on the island. The image processing products include the canopy height model (CHM), digital surface model (DSM), and digital terrain model (DTM), which were utilized to calculate the number, density, height and crown projected areas of trees. The CHM showed a high correlation with the forest's structure (R = 0.92), based on field measurements of tree heights. Our study accounted for approximately 67,340 trees taller than two meters in 2019. Over 90% of the cypress population consisted of young trees between 2 and 3 meters tall, which have recovered significantly following a fire in 2008 that burned 70% of its extent. A horizontal expansion of 134 hectares was observed from 2016 to 2019 in the regeneration process.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Este estudio emplea fotogrametría para evaluar y monitorear la recuperación del bosque de ciprés en la Isla Guadalupe, México, un ecosistema impactado por incendios y pastoreo excesivo. Se realizaron dos campañas de vuelo con drones sobre el área forestal durante los veranos de 2016 y 2019 utilizando cámaras de color natural (RGB) e infrarrojo cercano (NIR). Se presenta la primera reconstrucción completa en 3D del bosque de ciprés de la isla. Los productos de procesamiento de imágenes incluyen el modelo de altura del dosel (CHM), el modelo digital de superficie (DSM) y el modelo digital del terreno (DTM), que se utilizaron para calcular el número, la densidad, la altura y las áreas proyectadas de la copa de los árboles. El CHM mostró una alta correlación con la estructura del bosque (R = 0.92), según mediciones de campo de las alturas de los árboles. En nuestro estudio se reportan ~ 67 340 árboles de más de dos metros de altura en 2019. Más del 90% de la población de cipreses estaba formada por árboles jóvenes de entre 2 y 3 metros de altura, que se han recuperado significativamente después de un devastador incendio en 2008 que quemó el 70% de su extensión. Se observó una expansión horizontal de 134 hectáreas de 2016 a 2019.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Aerial Drone Surveys]]></kwd>
<kwd lng="en"><![CDATA[Cypress Forest]]></kwd>
<kwd lng="en"><![CDATA[Vegetation Structure]]></kwd>
<kwd lng="en"><![CDATA[Canopy Height Model]]></kwd>
<kwd lng="en"><![CDATA[Forest Regeneration]]></kwd>
<kwd lng="es"><![CDATA[levantamiento aéreo por dron]]></kwd>
<kwd lng="es"><![CDATA[bosque de ciprés]]></kwd>
<kwd lng="es"><![CDATA[modelos altura de dosel]]></kwd>
<kwd lng="es"><![CDATA[estructura vertical de vegetación]]></kwd>
<kwd lng="es"><![CDATA[regeneración del bosque]]></kwd>
</kwd-group>
</article-meta>
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