Luis Palacios - Academia.edu (original) (raw)

Papers by Luis Palacios

Cogent Food & Agriculture, 2017

Irrigated agriculture is a key activity for the long-term survival of humanenvironmental systems ... more Irrigated agriculture is a key activity for the long-term survival of humanenvironmental systems and the assessment of agricultural sustainability has been gaining increasing relevance. In spite of several proposals developed, there is not a holistic approach that can be generally applied to assess sustainability of irrigated agricultural areas. In this paper we present a framework and associated indicators for the assessment of sustainability of irrigated agricultural systems in different contexts and locations. The framework covers four main sustainability dimensions: environmental integrity, economic resilience and profitability, social wellbeing and good governance. This approach was tested in 10 agricultural areas in eight different countries that represent a wide variety of situations in terms of agricultural development, environmental conditions, socioeconomic settings and political contexts, but that share the fact that water use is a critical aspect for agricultural development. The obtained results illustrate the usefulness of the proposed framework to obtain a holistic picture of sustainability in irrigated agriculture areas, even in situations

Terra Latinoamericana, 2018

Salinization of agricultural soils is one of the limiting factors of modern agriculture. For this... more Salinization of agricultural soils is one of the limiting factors of modern agriculture. For this reason, understanding the effects of this phenomenon is of interest to agricultural sciences. The ability to predict its progress as well as continuous monitoring can support decision-making for sustainable use of the soil resource. In the present work, the spectral space of crop reflectances is analyzed, with special emphasis on the case of soils fully covered by crops in the context of spectral growth patterns. Starting from the effects of salinity in the crops, the biphasic model of Munns and Termmat is introduced, adapting it for the case of spectral spaces of the reflectance of the crop canopy. The model was partially validated with data from experiments (soybean and barley) published in the literature. From the analysis of tolerance patterns of the barley experiment, it is necessary to make these estimations under standardized conditions of development stages. The different patter...

Agrociencia, 2005

Based on analysis of the spectral dependence of leaf reflectance, the spectral spaces of reflecta... more Based on analysis of the spectral dependence of leaf reflectance, the spectral spaces of reflectance of different crop types are analyzed from the perspective of the relationship between crop growth and Leaf Area Index (LAI). Using the quasi linear properties of the iso-LAI curves, the validity of different vegetation indices proposed in the literature is discussed and their limitations clarified. Likewise, the effects of the zenithal illumination angle, the changes on leaf reflectivity and the changes on the angular distribution of crop foliage upon the spectral patterns of the soilvegetation complex, are studied using the SAIL model (Verhoef, 1984) for radiative transfer in the crop canopy. Finally, invariance properties of the solutions for photon transfer processes in crop foliage and a methodology for modeling crop growth stage is discussed.

Boletín Técnico

... Signatura : 711. Autor : Palacios Sánchez, Luis Alberto. Título : Determinación de modelos ma... more ... Signatura : 711. Autor : Palacios Sánchez, Luis Alberto. Título : Determinación de modelos matemáticos empíricos del coeficiente de gasto en compuertas radiales / por Luis Alberto PalaciosSánchez. P.imprenta : Chapingo, Méx. : UACH-Departamento de Irrigación. 36 h.. ...

UACH. Depto. de Irrigación. Boletín técnico.

SIDALC - Servicio de Informacion y Documentacion Agropecuaria de las Americas.

orton.catie.ac.cr

Corrector atmosférico en imágenes landsat / por Luis Alberto Palacios Sánchez. ... Montecillo, Te... more Corrector atmosférico en imágenes landsat / por Luis Alberto Palacios Sánchez. ... Montecillo, Texcoco, Estado de México 92 p. : il. ... Tesis (Doctor en Ciencias, especialista en Hidrociencias) -- Colegio de Postgraduados, 2007.

Revista Mexicana de Ciencias Pecuarias, 2011

Development of historic vegetation growth curves for both grasslands and shrublands in Mexico bec... more Development of historic vegetation growth curves for both grasslands and shrublands in Mexico becomes a real challenge due to lack of statistics. Remote sensing technology using satellites, allows obtaining a first approximation through vegetation indices (VI). The present study discusses an indirect parametric modeling of the biomass growth curve in individual pixels of both Advanced Very High Resolution Radiometer (AVHRR) and Moderate Resolution Imaging Spectroradiometer (MODIS), thus allowing their characterization using pre and post process algorithms. Results obtained through application of the algorithms discussed in the present paper, allow obtaining annual growth curves at 100 ha (AHVRR) and 6.25 ha (MODIS) scales that can be used in studies on climate change and on grassland/shrubland management in Mexico.

REVISTA TERRA LATINOAMERICANA, 2018

Los efectos atmosféricos en las imágenes satelitales distorsionan la información disponible y ori... more Los efectos atmosféricos en las imágenes satelitales distorsionan la información disponible y originan errores en la estimación de las variables biofísicas provenientes de los datos espectrales. En este trabajo se desarrolló un algoritmo de corrección atmosférica que se basó en la correlación existente entre la reflectancia de la banda 7 (infrarrojo medio, 2.2 μm) y la banda 1 (Azul, 0.485 μm) de la vegetación, para los sensores TM y ETM+. La ordenada al origen de la regresión entre la banda 7 y la banda 1 de imágenes Landsat es un estimador de la reflectancia de trayectoria en la banda 1. Con esta reflectancia de trayectoria y un modelo de atmósfera y aerosol def inido, es posible estimar el espesor óptico de los aerosoles centrado en 0.55 μm. El algoritmo se apoyó en el acoplamiento de varios modelos de simulación y bibliotecas de datos espectrales para la representación del sistema óptico suelo–vegetación–atmósfera. La vegetación en una imagen se identif ica mediante un clasif ic...

Tecnología y ciencias del agua, 2011

En el año 2000, la Comisión Europea financió un proyecto denominado DEMETER, (Demonstration of Ea... more En el año 2000, la Comisión Europea financió un proyecto denominado DEMETER, (Demonstration of Earth Observation Technologies in Routine Irrigation Advisory Services), cuyo objetivo principal fue lograr que los países mediterráneos de Europa, como Grecia, Italia, Portugal y España, mejoraran el uso del agua en el sector agrícola. Considerando los resultados obtenidos, la Comisión financió otro proyecto más ambicioso, cuyo acrónimo fue PLEIADeS (Participatory Multi-Level EO-Assisted Tools for Irrigation Water Management and Agricultural Decision-Support), en el que participaron 11 países, entre los cuales se consideró a México. Durante los años 2006 a 2009, se estableció en el estado de Sonora, en el noroeste de México, el proyecto PLEIADeS, con el objetivo, entre varios otros, de apoyar a los productores de tres distritos de riego de ese estado en el mejoramiento del uso del agua de riego. Como parte de sus resultados, se pudo adaptar una tecnología basada en la observación de la ti...

Nitrogen use efficiency of nitrogen use in agriculture is very low, causing environmental problem... more Nitrogen use efficiency of nitrogen use in agriculture is very low, causing environmental problems and low crop productivity, therefore, knowing the spatial and temporal distribution of biophysical variables such as the fractional vegetation cover (FVC) and the canopy nitrogen content (CNC) of the crops will provide valuable information to improve this condition. The use of freely accessible satellite imagery, such as Sentinel-2 (S-2) images, can facilitate this task. Due to the above, a study was carried out in six corn plots grown by producers in Texcoco de Mora, Estado de Mexico. The first objective was to investigate the relationship between spectral indices, estimated from the reflectance measured with a multispectral radiometer at surface level and S-2 images, with FVC, estimated by digital photographs through the Canopeo mobile application. The second objective was to obtain a linear model that estimated the CNC from the analysis of different spectral indices. Two models were...

Cogent Food & Agriculture

Irrigated agriculture is a key activity for the long-term survival of humanenvironmental systems ... more Irrigated agriculture is a key activity for the long-term survival of humanenvironmental systems and the assessment of agricultural sustainability has been gaining increasing relevance. In spite of several proposals developed, there is not a holistic approach that can be generally applied to assess sustainability of irrigated agricultural areas. In this paper we present a framework and associated indicators for the assessment of sustainability of irrigated agricultural systems in different contexts and locations. The framework covers four main sustainability dimensions: environmental integrity, economic resilience and profitability, social wellbeing and good governance. This approach was tested in 10 agricultural areas in eight different countries that represent a wide variety of situations in terms of agricultural development, environmental conditions, socioeconomic settings and political contexts, but that share the fact that water use is a critical aspect for agricultural development. The obtained results illustrate the usefulness of the proposed framework to obtain a holistic picture of sustainability in irrigated agriculture areas, even in situations

Revista Mexicana de Ciencias Pecuarias

El desarrollo de curvas del crecimiento de la vegetación (pastizales y matorrales), a nivel histó... more El desarrollo de curvas del crecimiento de la vegetación (pastizales y matorrales), a nivel histórico, plantea retos importantes por falta de estadísticas en México. La tecnología de sensores remotos en plataformas espaciales, por medio de índices de vegetación o IV, permite realizar una aproximación en esta dirección. Este trabajo discute un esquema de modelación paramétrica (indirecta) de la curva de crecimiento de la biomasa en píxeles individuales de sensores Advanced Very High Resolution Radiometer o AVHRR y Moderate Resolution Imaging Spectroradiometer o MODIS, permitiendo así su caracterización usando algoritmos de pre y post-proceso. Los resultados obtenidos de la aplicación de los algoritmos discutidos en este trabajo, permiten la obtención de curvas anuales del crecimiento a la escala de 100 ha (AVHRR) y 6.25 ha (MODIS), que pueden ser usadas en estudios de cambio climático y del manejo de agostaderos en México.

En el año 2000, la Comisión Europea financió un proyecto denominado DEMETER, (Demonstration of Ea... more En el año 2000, la Comisión Europea financió un proyecto denominado DEMETER, (Demonstration of Earth Observation Technologies in Routine Irrigation Advisory Services), cuyo objetivo principal fue lograr que los países mediterráneos de Europa, como Grecia, Italia, Portugal y España, mejoraran el uso del agua en el sector agrícola. Considerando los resultados obtenidos, la Comisión financió otro proyecto más ambicioso, cuyo acrónimo fue PLEIADeS (Participatory Multi-Level EO-Assisted Tools for Irrigation Water Management and Agricultural Decision-Support), en el que participaron 11 países, entre los cuales se consideró a México. Durante los años 2006 a 2009, se estableció en el estado de Sonora, en el noroeste de México, el proyecto PLEIADeS, con el objetivo, entre varios otros, de apoyar a los productores de tres distritos de riego de ese estado en el mejoramiento del uso del agua de riego. Como parte de sus resultados, se pudo adaptar una tecnología basada en la observación de la ti...

ABSTRACT Abstract: By the end of sixties, several satellites were launched to observe the earth; ... more ABSTRACT Abstract: By the end of sixties, several satellites were launched to observe the earth; among them the Landsat missions have been important to study natural resources, especially in agriculture. Currently, Landsat 7, with some problems, and Landsat 5 are useful to evaluate crop development. A project called “Participatory multi-Level EO-assisted tools for Irrigation water management and Agricultural Decision-Support” (PLEIADeS) was financed by the European Commission. This project considers eleven countries and 23 research institutions, Mexico being one of the selected countries. Landsat images are a basic tool of this project. Some of the results obtained in this study are presented in this article. By using vegetation indices obtained by the combinations of reflectances in different bands of the electromagnetic spectrum, it has been possible to estimate the behavior of several biophysical parameters of crops which are used to evaluate plant development, water stress, spatial soil variation, and the effect of plagues and crop diseases. To facilitate this process, a visor was developed, named SPIDER (System of Participatory Information Decision support and Expert knowledge for River basin management) whose use in this work is explained.

Agrociencia, 2008

RESUMEN La optimización de los índices espectrales de la vegetación para reducir el efecto del su... more RESUMEN La optimización de los índices espectrales de la vegetación para reducir el efecto del suelo y de la atmósfera, requiere hipótesis fuertes cuando no hay conocimiento relacionado con las variables atmosféricas y sólo información contenida en las imágenes ...

… de Recursos Naturales, 2005

Using invariant patterns of bare soil and dense vegetation in the red and near infrared space, se... more Using invariant patterns of bare soil and dense vegetation in the red and near infrared space, several approaches for relative atmospheric correction between pairs of satellite images are presented. Methods proposed are reviewed considering temporal changes in the reflectance of bare soil and dense vegetation in short periods of time using radiative transfer simulations. Also, the use of isolines of vegetation, any coberture, is used in a general method to correct the atmospheric effect in satellite images. The methods introduced in this paper are exemplified using radiative simulations with the 6S model, under generic atmosphere profiles. The results of the different approaches are discussed in regards to real applications found in the field.

Agrociencia, 2008

El problema del efecto de escala en las reflectancias de los cul-tivos ha sido enfocado probabilí... more El problema del efecto de escala en las reflectancias de los cul-tivos ha sido enfocado probabilística y determinísticamente. Como parte del análisis de varios experimentos realizados en el Colegio de Postgraduados, Montecillo, México, se revisó la versión probabilística usando una ...

The optimization of the spectral vegetation indices to reduce the effects of soil and atmosphere,... more The optimization of the spectral vegetation indices to reduce the effects of soil and atmosphere, requires strong hypotheses when there is no knowledge related to the atmospheric variables and only information contained in the satellite images. The optimization of the index NDVIcp, designed to minimize the effect of soil, is analyzed under a perspective of its viability and of the

…, 2007

Hay muchos índices de vegetación (IV) basados en relaciones del espacio espectral del rojo e infr... more Hay muchos índices de vegetación (IV) basados en relaciones del espacio espectral del rojo e infrarrojo cercano. En este trabajo se hace una revisión de la estructura de los IV más utilizados, usando una formulación para caracterizar curvas de igual índice de área foliar. Con el fin de resolver las inconsistencias encontradas en los IV, se propone uno nuevo (NDVIcp), basado en la estructura correcta del problema, bajo consideraciones empíricas. El NDVIcp se valida usando datos de experimentos en campo con maíz (Zea mays, L.) y algodón (Gossipyum spp).

Agrociencia, 2006

Canopy reflectance patterns in a soil crop vegetation system are studied using different transfor... more 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.

Cogent Food & Agriculture, 2017

Irrigated agriculture is a key activity for the long-term survival of humanenvironmental systems ... more Irrigated agriculture is a key activity for the long-term survival of humanenvironmental systems and the assessment of agricultural sustainability has been gaining increasing relevance. In spite of several proposals developed, there is not a holistic approach that can be generally applied to assess sustainability of irrigated agricultural areas. In this paper we present a framework and associated indicators for the assessment of sustainability of irrigated agricultural systems in different contexts and locations. The framework covers four main sustainability dimensions: environmental integrity, economic resilience and profitability, social wellbeing and good governance. This approach was tested in 10 agricultural areas in eight different countries that represent a wide variety of situations in terms of agricultural development, environmental conditions, socioeconomic settings and political contexts, but that share the fact that water use is a critical aspect for agricultural development. The obtained results illustrate the usefulness of the proposed framework to obtain a holistic picture of sustainability in irrigated agriculture areas, even in situations

Terra Latinoamericana, 2018

Salinization of agricultural soils is one of the limiting factors of modern agriculture. For this... more Salinization of agricultural soils is one of the limiting factors of modern agriculture. For this reason, understanding the effects of this phenomenon is of interest to agricultural sciences. The ability to predict its progress as well as continuous monitoring can support decision-making for sustainable use of the soil resource. In the present work, the spectral space of crop reflectances is analyzed, with special emphasis on the case of soils fully covered by crops in the context of spectral growth patterns. Starting from the effects of salinity in the crops, the biphasic model of Munns and Termmat is introduced, adapting it for the case of spectral spaces of the reflectance of the crop canopy. The model was partially validated with data from experiments (soybean and barley) published in the literature. From the analysis of tolerance patterns of the barley experiment, it is necessary to make these estimations under standardized conditions of development stages. The different patter...

Agrociencia, 2005

Based on analysis of the spectral dependence of leaf reflectance, the spectral spaces of reflecta... more Based on analysis of the spectral dependence of leaf reflectance, the spectral spaces of reflectance of different crop types are analyzed from the perspective of the relationship between crop growth and Leaf Area Index (LAI). Using the quasi linear properties of the iso-LAI curves, the validity of different vegetation indices proposed in the literature is discussed and their limitations clarified. Likewise, the effects of the zenithal illumination angle, the changes on leaf reflectivity and the changes on the angular distribution of crop foliage upon the spectral patterns of the soilvegetation complex, are studied using the SAIL model (Verhoef, 1984) for radiative transfer in the crop canopy. Finally, invariance properties of the solutions for photon transfer processes in crop foliage and a methodology for modeling crop growth stage is discussed.

Boletín Técnico

... Signatura : 711. Autor : Palacios Sánchez, Luis Alberto. Título : Determinación de modelos ma... more ... Signatura : 711. Autor : Palacios Sánchez, Luis Alberto. Título : Determinación de modelos matemáticos empíricos del coeficiente de gasto en compuertas radiales / por Luis Alberto PalaciosSánchez. P.imprenta : Chapingo, Méx. : UACH-Departamento de Irrigación. 36 h.. ...

UACH. Depto. de Irrigación. Boletín técnico.

SIDALC - Servicio de Informacion y Documentacion Agropecuaria de las Americas.

orton.catie.ac.cr

Corrector atmosférico en imágenes landsat / por Luis Alberto Palacios Sánchez. ... Montecillo, Te... more Corrector atmosférico en imágenes landsat / por Luis Alberto Palacios Sánchez. ... Montecillo, Texcoco, Estado de México 92 p. : il. ... Tesis (Doctor en Ciencias, especialista en Hidrociencias) -- Colegio de Postgraduados, 2007.

Revista Mexicana de Ciencias Pecuarias, 2011

Development of historic vegetation growth curves for both grasslands and shrublands in Mexico bec... more Development of historic vegetation growth curves for both grasslands and shrublands in Mexico becomes a real challenge due to lack of statistics. Remote sensing technology using satellites, allows obtaining a first approximation through vegetation indices (VI). The present study discusses an indirect parametric modeling of the biomass growth curve in individual pixels of both Advanced Very High Resolution Radiometer (AVHRR) and Moderate Resolution Imaging Spectroradiometer (MODIS), thus allowing their characterization using pre and post process algorithms. Results obtained through application of the algorithms discussed in the present paper, allow obtaining annual growth curves at 100 ha (AHVRR) and 6.25 ha (MODIS) scales that can be used in studies on climate change and on grassland/shrubland management in Mexico.

REVISTA TERRA LATINOAMERICANA, 2018

Los efectos atmosféricos en las imágenes satelitales distorsionan la información disponible y ori... more Los efectos atmosféricos en las imágenes satelitales distorsionan la información disponible y originan errores en la estimación de las variables biofísicas provenientes de los datos espectrales. En este trabajo se desarrolló un algoritmo de corrección atmosférica que se basó en la correlación existente entre la reflectancia de la banda 7 (infrarrojo medio, 2.2 μm) y la banda 1 (Azul, 0.485 μm) de la vegetación, para los sensores TM y ETM+. La ordenada al origen de la regresión entre la banda 7 y la banda 1 de imágenes Landsat es un estimador de la reflectancia de trayectoria en la banda 1. Con esta reflectancia de trayectoria y un modelo de atmósfera y aerosol def inido, es posible estimar el espesor óptico de los aerosoles centrado en 0.55 μm. El algoritmo se apoyó en el acoplamiento de varios modelos de simulación y bibliotecas de datos espectrales para la representación del sistema óptico suelo–vegetación–atmósfera. La vegetación en una imagen se identif ica mediante un clasif ic...

Tecnología y ciencias del agua, 2011

En el año 2000, la Comisión Europea financió un proyecto denominado DEMETER, (Demonstration of Ea... more En el año 2000, la Comisión Europea financió un proyecto denominado DEMETER, (Demonstration of Earth Observation Technologies in Routine Irrigation Advisory Services), cuyo objetivo principal fue lograr que los países mediterráneos de Europa, como Grecia, Italia, Portugal y España, mejoraran el uso del agua en el sector agrícola. Considerando los resultados obtenidos, la Comisión financió otro proyecto más ambicioso, cuyo acrónimo fue PLEIADeS (Participatory Multi-Level EO-Assisted Tools for Irrigation Water Management and Agricultural Decision-Support), en el que participaron 11 países, entre los cuales se consideró a México. Durante los años 2006 a 2009, se estableció en el estado de Sonora, en el noroeste de México, el proyecto PLEIADeS, con el objetivo, entre varios otros, de apoyar a los productores de tres distritos de riego de ese estado en el mejoramiento del uso del agua de riego. Como parte de sus resultados, se pudo adaptar una tecnología basada en la observación de la ti...

Nitrogen use efficiency of nitrogen use in agriculture is very low, causing environmental problem... more Nitrogen use efficiency of nitrogen use in agriculture is very low, causing environmental problems and low crop productivity, therefore, knowing the spatial and temporal distribution of biophysical variables such as the fractional vegetation cover (FVC) and the canopy nitrogen content (CNC) of the crops will provide valuable information to improve this condition. The use of freely accessible satellite imagery, such as Sentinel-2 (S-2) images, can facilitate this task. Due to the above, a study was carried out in six corn plots grown by producers in Texcoco de Mora, Estado de Mexico. The first objective was to investigate the relationship between spectral indices, estimated from the reflectance measured with a multispectral radiometer at surface level and S-2 images, with FVC, estimated by digital photographs through the Canopeo mobile application. The second objective was to obtain a linear model that estimated the CNC from the analysis of different spectral indices. Two models were...

Cogent Food & Agriculture

Irrigated agriculture is a key activity for the long-term survival of humanenvironmental systems ... more Irrigated agriculture is a key activity for the long-term survival of humanenvironmental systems and the assessment of agricultural sustainability has been gaining increasing relevance. In spite of several proposals developed, there is not a holistic approach that can be generally applied to assess sustainability of irrigated agricultural areas. In this paper we present a framework and associated indicators for the assessment of sustainability of irrigated agricultural systems in different contexts and locations. The framework covers four main sustainability dimensions: environmental integrity, economic resilience and profitability, social wellbeing and good governance. This approach was tested in 10 agricultural areas in eight different countries that represent a wide variety of situations in terms of agricultural development, environmental conditions, socioeconomic settings and political contexts, but that share the fact that water use is a critical aspect for agricultural development. The obtained results illustrate the usefulness of the proposed framework to obtain a holistic picture of sustainability in irrigated agriculture areas, even in situations

Revista Mexicana de Ciencias Pecuarias

El desarrollo de curvas del crecimiento de la vegetación (pastizales y matorrales), a nivel histó... more El desarrollo de curvas del crecimiento de la vegetación (pastizales y matorrales), a nivel histórico, plantea retos importantes por falta de estadísticas en México. La tecnología de sensores remotos en plataformas espaciales, por medio de índices de vegetación o IV, permite realizar una aproximación en esta dirección. Este trabajo discute un esquema de modelación paramétrica (indirecta) de la curva de crecimiento de la biomasa en píxeles individuales de sensores Advanced Very High Resolution Radiometer o AVHRR y Moderate Resolution Imaging Spectroradiometer o MODIS, permitiendo así su caracterización usando algoritmos de pre y post-proceso. Los resultados obtenidos de la aplicación de los algoritmos discutidos en este trabajo, permiten la obtención de curvas anuales del crecimiento a la escala de 100 ha (AVHRR) y 6.25 ha (MODIS), que pueden ser usadas en estudios de cambio climático y del manejo de agostaderos en México.

En el año 2000, la Comisión Europea financió un proyecto denominado DEMETER, (Demonstration of Ea... more En el año 2000, la Comisión Europea financió un proyecto denominado DEMETER, (Demonstration of Earth Observation Technologies in Routine Irrigation Advisory Services), cuyo objetivo principal fue lograr que los países mediterráneos de Europa, como Grecia, Italia, Portugal y España, mejoraran el uso del agua en el sector agrícola. Considerando los resultados obtenidos, la Comisión financió otro proyecto más ambicioso, cuyo acrónimo fue PLEIADeS (Participatory Multi-Level EO-Assisted Tools for Irrigation Water Management and Agricultural Decision-Support), en el que participaron 11 países, entre los cuales se consideró a México. Durante los años 2006 a 2009, se estableció en el estado de Sonora, en el noroeste de México, el proyecto PLEIADeS, con el objetivo, entre varios otros, de apoyar a los productores de tres distritos de riego de ese estado en el mejoramiento del uso del agua de riego. Como parte de sus resultados, se pudo adaptar una tecnología basada en la observación de la ti...

ABSTRACT Abstract: By the end of sixties, several satellites were launched to observe the earth; ... more ABSTRACT Abstract: By the end of sixties, several satellites were launched to observe the earth; among them the Landsat missions have been important to study natural resources, especially in agriculture. Currently, Landsat 7, with some problems, and Landsat 5 are useful to evaluate crop development. A project called “Participatory multi-Level EO-assisted tools for Irrigation water management and Agricultural Decision-Support” (PLEIADeS) was financed by the European Commission. This project considers eleven countries and 23 research institutions, Mexico being one of the selected countries. Landsat images are a basic tool of this project. Some of the results obtained in this study are presented in this article. By using vegetation indices obtained by the combinations of reflectances in different bands of the electromagnetic spectrum, it has been possible to estimate the behavior of several biophysical parameters of crops which are used to evaluate plant development, water stress, spatial soil variation, and the effect of plagues and crop diseases. To facilitate this process, a visor was developed, named SPIDER (System of Participatory Information Decision support and Expert knowledge for River basin management) whose use in this work is explained.

Agrociencia, 2008

RESUMEN La optimización de los índices espectrales de la vegetación para reducir el efecto del su... more RESUMEN La optimización de los índices espectrales de la vegetación para reducir el efecto del suelo y de la atmósfera, requiere hipótesis fuertes cuando no hay conocimiento relacionado con las variables atmosféricas y sólo información contenida en las imágenes ...

… de Recursos Naturales, 2005

Using invariant patterns of bare soil and dense vegetation in the red and near infrared space, se... more Using invariant patterns of bare soil and dense vegetation in the red and near infrared space, several approaches for relative atmospheric correction between pairs of satellite images are presented. Methods proposed are reviewed considering temporal changes in the reflectance of bare soil and dense vegetation in short periods of time using radiative transfer simulations. Also, the use of isolines of vegetation, any coberture, is used in a general method to correct the atmospheric effect in satellite images. The methods introduced in this paper are exemplified using radiative simulations with the 6S model, under generic atmosphere profiles. The results of the different approaches are discussed in regards to real applications found in the field.

Agrociencia, 2008

El problema del efecto de escala en las reflectancias de los cul-tivos ha sido enfocado probabilí... more El problema del efecto de escala en las reflectancias de los cul-tivos ha sido enfocado probabilística y determinísticamente. Como parte del análisis de varios experimentos realizados en el Colegio de Postgraduados, Montecillo, México, se revisó la versión probabilística usando una ...

The optimization of the spectral vegetation indices to reduce the effects of soil and atmosphere,... more The optimization of the spectral vegetation indices to reduce the effects of soil and atmosphere, requires strong hypotheses when there is no knowledge related to the atmospheric variables and only information contained in the satellite images. The optimization of the index NDVIcp, designed to minimize the effect of soil, is analyzed under a perspective of its viability and of the

…, 2007

Hay muchos índices de vegetación (IV) basados en relaciones del espacio espectral del rojo e infr... more Hay muchos índices de vegetación (IV) basados en relaciones del espacio espectral del rojo e infrarrojo cercano. En este trabajo se hace una revisión de la estructura de los IV más utilizados, usando una formulación para caracterizar curvas de igual índice de área foliar. Con el fin de resolver las inconsistencias encontradas en los IV, se propone uno nuevo (NDVIcp), basado en la estructura correcta del problema, bajo consideraciones empíricas. El NDVIcp se valida usando datos de experimentos en campo con maíz (Zea mays, L.) y algodón (Gossipyum spp).

Agrociencia, 2006

Canopy reflectance patterns in a soil crop vegetation system are studied using different transfor... more 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.