<?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>S0188-46111998000200005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Monitoreo del desarrollo de cultivos de temporal en la Mesa Central, Guanajuato, México, usando imágenes NOAA AVHRR]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Granados Ramírez]]></surname>
<given-names><![CDATA[Rebeca]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geografía ]]></institution>
<addr-line><![CDATA[D.F. ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>1998</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>1998</year>
</pub-date>
<numero>36</numero>
<fpage>45</fpage>
<lpage>55</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-46111998000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-46111998000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-46111998000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El análisis de los índices de vegetación derivados de las bandas visible e infrarrojo por el Radiómetro Avanzado de Muy Alta Resolución (AVHRR) de los satélites NOAA, es una herramienta útil para monitorear cambios en la densidad y vigor de los cultivos a lo largo de un ciclo agrícola. Este trabajo es un ejemplo del uso de las técnicas de detección en áreas cultivadas. La zona estudiada corresponde a la provincia fisiagráfica del estado de Guanajuato denominada Mesa Central, la cual, en general, posee características físicas, tales como topografía y suelos homogéneos y presencia de una marcada época de precipitación. Dentro de los cultivos que sustentan estas áreas, sobresalen las superficies sembradas de maíz y frijol, cuyo periodo de siembra - cosecha durante el ciclo productivo 1996 fue de agosta - noviembre. Paralelamente se recopilaron datos de campo como temperaturas, precipitaciones diarias y la situación meteorológica prevaleciente en diversos niveles de la atmósfera. Se digitizaron las áreas cultivadas y los suelos bajo el sistema ILWIS. Se obtuvieron además los datos de época de siembra, variedades utilizadas, fecha del periodo vegetativo, reproductivo y madurez. Se presentan los resultados de las relaciones entre los valores de Índice de Vegetación de Diferencia Normalizada (NDVI) obtenidos de los compuestos de imágenes de satélite en diferentes fechas, con diversos aspectos físicos como precipitación, siniestros climáticos e igualmente con el periodo vegetativo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The analysis of vegetation indexes derived from the visible and infrared bands of the Advenced Very High Resolution Radiometer (AVHRR) onboard NOAA satellites, is a useful tool for monitoring density changes and crops heatth over an agricultural cycle. This work is an example of the use of detection techniques in cultivated areas. The study zone belongs to the physiographical province of 1he Guanajuato state, known as Mesa Central, which possesses, in general, physical characteristics such as homogeneous topography and soils and a well marked precipitation season. Among the crops growing in these areas, the most outstanding are bean and maize which had during the 1996 seeding-harvest period their most productive cycle within August - November. Field data such as temperature, daily precipitation and meteorological information at different atmospheric heights were gathered likewise. Cultivated and soils areas were digitized under ILWIS system environment. Additionally, data on seeding time, types used and growing, reproductive and maturity periods were obtained. Resuls of the relation among the Normalized Difference Vegetation Index (NDVI) values obtained from satellite images at different dates and physical parameters such as precipitation, climatic adversities and growing period are presented.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[índice de vegetación]]></kwd>
<kwd lng="es"><![CDATA[cultivos]]></kwd>
<kwd lng="es"><![CDATA[periodo vegetativo]]></kwd>
<kwd lng="en"><![CDATA[Vegetation Index]]></kwd>
<kwd lng="en"><![CDATA[crops]]></kwd>
<kwd lng="en"><![CDATA[growing period]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="center"><font face="verdana" size="4"><b>Monitoreo del desarrollo de cultivos de temporal en la Mesa Central, Guanajuato, M&eacute;xico, usando im&aacute;genes NOAA AVHRR</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Rebeca Granados Ram&iacute;rez*&nbsp;</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>*Autor para correspondencia: Instituto de Geograf&iacute;a, UNAM, M&eacute;xico (becaria de doctorado&#45;CONACyT) Instituto de Geograf&iacute;a, UNAM. Circulo Exterior S/N Ciudad Universitaria, C.P. 04510 M&eacute;xico. D.F.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido: abril 20, 1998    <br> 	Aceptado en versi&oacute;n final: junio 12, 1998</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El an&aacute;lisis de los &iacute;ndices de vegetaci&oacute;n derivados de las bandas visible e infrarrojo por el Radi&oacute;metro Avanzado de Muy Alta Resoluci&oacute;n (AVHRR) de los sat&eacute;lites NOAA, es una herramienta &uacute;til para monitorear cambios en la densidad y vigor de los cultivos a lo largo de un ciclo agr&iacute;cola. Este trabajo es un ejemplo del uso de las t&eacute;cnicas de detecci&oacute;n en &aacute;reas cultivadas. La zona estudiada corresponde a la provincia fisiagr&aacute;fica del estado de Guanajuato denominada Mesa Central, la cual, en general, posee caracter&iacute;sticas f&iacute;sicas, tales como topograf&iacute;a y suelos homog&eacute;neos y presencia de una marcada &eacute;poca de precipitaci&oacute;n. Dentro de los cultivos que sustentan estas &aacute;reas, sobresalen las superficies sembradas de ma&iacute;z y frijol, cuyo periodo de siembra &#45; cosecha durante el ciclo productivo 1996 fue de agosta &#45; noviembre. Paralelamente se recopilaron datos de campo como temperaturas, precipitaciones diarias y la situaci&oacute;n meteorol&oacute;gica prevaleciente en diversos niveles de la atm&oacute;sfera. Se digitizaron las &aacute;reas cultivadas y los suelos bajo el sistema ILWIS. Se obtuvieron adem&aacute;s los datos de &eacute;poca de siembra, variedades utilizadas, fecha del periodo vegetativo, reproductivo y madurez. Se presentan los resultados de las relaciones entre los valores de &Iacute;ndice de Vegetaci&oacute;n de Diferencia Normalizada (NDVI) obtenidos de los compuestos de im&aacute;genes de sat&eacute;lite en diferentes fechas, con diversos aspectos f&iacute;sicos como precipitaci&oacute;n, siniestros clim&aacute;ticos e igualmente con el periodo vegetativo.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave</b>: &iacute;ndice de vegetaci&oacute;n, cultivos, periodo vegetativo.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The analysis of vegetation indexes derived from the visible and infrared bands of the Advenced Very High Resolution Radiometer (AVHRR) onboard NOAA satellites, is a useful tool for monitoring density changes and crops heatth over an agricultural cycle. This work is an example of the use of detection techniques in cultivated areas. The study zone belongs to the physiographical province of 1he Guanajuato state, known as Mesa Central, which possesses, in general, physical characteristics such as homogeneous topography and soils and a well marked precipitation season. Among the crops growing in these areas, the most outstanding are bean and maize which had during the 1996 seeding&#45;harvest period their most productive cycle within August &#45; November. Field data such as temperature, daily precipitation and meteorological information at different atmospheric heights were gathered likewise. Cultivated and soils areas were digitized under ILWIS system environment. Additionally, data on seeding time, types used and growing, reproductive and maturity periods were obtained. Resuls of the relation among the Normalized Difference Vegetation Index (NDVI) values obtained from satellite images at different dates and physical parameters such as precipitation, climatic adversities and growing period are presented.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words</b>: Vegetation Index, crops, growing period.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/igeo/n36/n36a5.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>REFERENCIAS</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Anderson, G. L, J. D. Hanson y R. H. Hass (1993), "Evaluating Landsat Mapper Derived Vegetation Indices for Estimating Above&#45;Ground Biomass on Semiarid Rangelands", <i>Ramote Sensing of the Environment,</i> 35:11&#45;27.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4627836&pid=S0188-4611199800020000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Bartholom&eacute;, E. (1988), "Radiometric Measurements and Crop Yield Forecasting. Some Observation Over Millet and Sorghum Experimental Plots in Mali", <i>International Journal of Remote Sensing,</i> 9:1522&#45;1539.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4627838&pid=S0188-4611199800020000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Ehrlich, D., J. E. Estes y A. Singh (1994), "Applications of NOAA &#45; AVHRR 1 Km. Data for Environmental Monitoring", <i>International Journal of Remote Sensing,</i> 15: 745&#45;761</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4627840&pid=S0188-4611199800020000500003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">Gand&iacute;a, S. y Meli&aacute;, J. (1991), Curso de Postgrado. La Teledetecci&oacute;n en el Seguimiento de los Fen&oacute;menos Naturales. Recursos Renovables: Agricultura, Universidad de Valencia, Unidad de Teledetecci&oacute;n, Valencia, Espa&ntilde;a.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4627841&pid=S0188-4611199800020000500004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Granados, R. R., T. Reyna. T. y G. G&oacute;mez. R. (1996), "La Teledetecci&oacute;n en el seguimiento de las superficies cultivadas de la Mesa Central de Guanajuato", Res&uacute;menes, VII Reuni&oacute;n Nacional Selper&#45;M&eacute;xico, Colima, Col., p. 3.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4627843&pid=S0188-4611199800020000500005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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