<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952006000100099</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Determinación del estado de crecimiento de cultivos usando la transformada de Hough de las reflectividades del follaje]]></article-title>
<article-title xml:lang="en"><![CDATA[Determination of growth stage in crops using the Hough transform of canopy reflectance]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz-Pellat]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palacios-Velez]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mejía-Saenz]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Menes]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palacios-Sánchez]]></surname>
<given-names><![CDATA[Luis A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Montecillo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2006</year>
</pub-date>
<volume>40</volume>
<numero>1</numero>
<fpage>99</fpage>
<lpage>108</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952006000100099&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952006000100099&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952006000100099&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se analizan los patrones de reflectividad del follaje de un sistema suelo-vegetación, utilizando diferentes transformaciones de las bandas espectrales del rojo e infrarrojo espectral, primero a uno paramétrico, el cual después es transformado a uno meta-paramétrico. Este último espacio caracteriza en forma total las curvas iso-IAF del follaje de un cultivo en crecimiento. La metodología propuesta se valida usando simulaciones generadas con el modelo SAIL de transferencia de radiación en el follaje.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Canopy reflectance patterns in a soil crop vegetation system are studied using different transformations of red and near infrared spectral bands, first to a parametric space, which is transformed into a meta-parametric space. The latter space completely characterizes the LAI (iso-LAI) curves and defines the crop growth stage. This can be used algorithmically to estimate the LAI for a growing crop. The proposed methodology is validated by simulations generated with the SAIL model for radiation transfer in the canopy.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Bandas del rojo e infrarrojo cercano]]></kwd>
<kwd lng="es"><![CDATA[estimación del IAF]]></kwd>
<kwd lng="es"><![CDATA[patrones espectrales]]></kwd>
<kwd lng="es"><![CDATA[transformada de Hough]]></kwd>
<kwd lng="en"><![CDATA[Red and near infrared bands]]></kwd>
<kwd lng="en"><![CDATA[LAI estimation]]></kwd>
<kwd lng="en"><![CDATA[spectral patterns]]></kwd>
<kwd lng="en"><![CDATA[Hough transform]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bausch]]></surname>
<given-names><![CDATA[W. C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Soil background effects on reflectance-based crop coefficients for corn]]></article-title>
<source><![CDATA[Remote Sensing Environ.]]></source>
<year>1993</year>
<volume>46</volume>
<page-range>213-22</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Duda]]></surname>
<given-names><![CDATA[R. O.]]></given-names>
</name>
<name>
<surname><![CDATA[Hart]]></surname>
<given-names><![CDATA[P. E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Pattern Classification and Scene Analysis]]></source>
<year>1973</year>
<publisher-loc><![CDATA[New York ]]></publisher-loc>
<publisher-name><![CDATA[John Wiley &amp; Sons]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gausman]]></surname>
<given-names><![CDATA[H. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Allen]]></surname>
<given-names><![CDATA[W. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Wiegand]]></surname>
<given-names><![CDATA[C. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Escobar]]></surname>
<given-names><![CDATA[D. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodriguez]]></surname>
<given-names><![CDATA[R. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Richardson]]></surname>
<given-names><![CDATA[A. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The leaf mesophylls of twenty crops, their light spectra, and optical and geometrical parameters]]></article-title>
<source><![CDATA[USDA Technical Bulletin]]></source>
<year>1973</year>
<numero>1465</numero>
<issue>1465</issue>
<page-range>59</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Goel]]></surname>
<given-names><![CDATA[N. S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Models of vegetation canopy reflectance and their use in the estimation of biophysical parameters from reflectance data]]></article-title>
<source><![CDATA[Remote Sensing Rev.]]></source>
<year>1988</year>
<volume>4</volume>
<page-range>1-222</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Huete]]></surname>
<given-names><![CDATA[A. R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Soil-dependent spectral response in a development plant canopy]]></article-title>
<source><![CDATA[Agron. J.]]></source>
<year>1987</year>
<volume>79</volume>
<page-range>61-8</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Huete]]></surname>
<given-names><![CDATA[A. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Jackson]]></surname>
<given-names><![CDATA[R. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Post]]></surname>
<given-names><![CDATA[D. F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spectral response of a plant canopy with different soil backgrounds]]></article-title>
<source><![CDATA[Remote Sensing Environ.]]></source>
<year>1985</year>
<volume>17</volume>
<page-range>35-53</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Knyazikhin]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Martonchik]]></surname>
<given-names><![CDATA[J. V.]]></given-names>
</name>
<name>
<surname><![CDATA[Myneni]]></surname>
<given-names><![CDATA[R. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Diner]]></surname>
<given-names><![CDATA[D. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Running]]></surname>
<given-names><![CDATA[S. W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Synergistic algorithm for estimating vegetation canopy leaf area index and fraction of absorbed photosynthetically active radiation from MODIS and MISR data]]></article-title>
<source><![CDATA[J. Geophysical Res.]]></source>
<year>1998</year>
<volume>103</volume>
<page-range>32257-75</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Knyazikhin]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Martonchik]]></surname>
<given-names><![CDATA[J. V.]]></given-names>
</name>
<name>
<surname><![CDATA[Diner]]></surname>
<given-names><![CDATA[D. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Myneni]]></surname>
<given-names><![CDATA[R. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Verstraete]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Pinty]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Gobron]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estimation of vegetation canopy leaf area index and fraction of absorbed photosyntheticallly active radiation from atmosphere-correct MISR data]]></article-title>
<source><![CDATA[J. Geophysical Res.]]></source>
<year>1998</year>
<volume>103</volume>
<page-range>32239-56</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Myneni]]></surname>
<given-names><![CDATA[R. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Ross]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Asrar]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A review of the theory of photon transport in leaf canopies in slab geometry]]></article-title>
<source><![CDATA[Agric. Forest Meteorology]]></source>
<year>1989</year>
<volume>45</volume>
<page-range>1-165</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tucker]]></surname>
<given-names><![CDATA[C. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Red and photographics infrared linear combination for monitoring vegetation]]></article-title>
<source><![CDATA[Remote Sensing Environ.]]></source>
<year>1979</year>
<volume>8</volume>
<page-range>127-50</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Verhoef]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Light scattering by leaf layers with application to canopy reflectance modeling: The SAIL model]]></article-title>
<source><![CDATA[Remote Sensing Environ.]]></source>
<year>1984</year>
<volume>16</volume>
<page-range>125-41</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Verstraete]]></surname>
<given-names><![CDATA[M. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Pinty]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Designing optical spectral indexes for remote sensing applications]]></article-title>
<source><![CDATA[IEEE Trans. Geoscience and Remote Sensing]]></source>
<year>1996</year>
<volume>34</volume>
<page-range>1254-65</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
