Angela De Santis - Academia.edu (original) (raw)
Papers by Angela De Santis
Journal of Conventional Weapons Destruction, 2021
El presente trabajo ha sido realizado en el marco del proyecto “Ecologia espacio-temporal y teled... more El presente trabajo ha sido realizado en el marco del proyecto “Ecologia espacio-temporal y teledeteccion de malas hierbas en cultivos de maiz” AGL2005-06180-C03-01 financiado por el Ministerio de Ciencia e Innovacion.
Revista de Teledetección, 2017
Wildfires destroy thousands of hectares of vegetation every year in Chile, a phenomenon that has ... more Wildfires destroy thousands of hectares of vegetation every year in Chile, a phenomenon that has steadily increased over time, both in terms of the number of fires and the area affected. Since 1985 until 2016 have occurred 1,476 wildfires severe in intensity (> 200 ha), that burned a total of about 1,243,407 ha of vegetation, and an average of 40,000 ha affected per year. Depending on the type and intensity of the fire, there are different levels of severity with which the fire affects the vegetation, a variation that is crucial for the estimation GEI in the event. The purpose of this research was to analyze the burn severity of Rufina wildfires occurred in 1999, in the VI Region of L. G. B. O’Higgins in Chile, south of the capital Santiago, using Landsat 5 TM and Landsat 7 ETM+ imagery, including in the analysis the estimated greenhouse gases emitted in relation to with the vegetation and burn severity. Burn severity was estimated through the Normalized Burn Ratio (dNBR) and GEI...
... Department of Geography, University of Alcalá, Calle Colegios 2, 28801 Alcalá de Henares (Mad... more ... Department of Geography, University of Alcalá, Calle Colegios 2, 28801 Alcalá de Henares (Madrid-Spain), angela.desantis@uah.es, marta.yebra@uah ... Laboratory radiometry experimentation at leaf level was performed with Cork oak (Quercus suber) (a Mediterranean ...
... METHODOLOGY Quercus ilex SPECIFIC LUT Marta Yebra, Angela De Santis and Emilio Chuvieco Depar... more ... METHODOLOGY Quercus ilex SPECIFIC LUT Marta Yebra, Angela De Santis and Emilio Chuvieco Department of Geography. University of Alcalá. Madrid. Spain. ... Journal of Geophysical Research - Biosciences, 111. Yebra, M., Chuvieco, E., & Riaño, D. (2007). ...
La cartografia y discriminacion de areas quemadas por incendios forestales constituye una fuente ... more La cartografia y discriminacion de areas quemadas por incendios forestales constituye una fuente de informacion clave para las tareas de gestion post-incendio. La teledeteccion ha demostrado ser una herramienta cada vez mas operativa para desempenar este tipo de trabajo. Este articulo reune y explica las ultimas aplicaciones y tecnicas de teledeteccion usadas para la cartografia de area quemada centrandose en aspectos de viabilidad espectral, escala y precision.
Contamination from remnants of conflict is a legacy of many armed conflicts, threatening human se... more Contamination from remnants of conflict is a legacy of many armed conflicts, threatening human security and impeding post-conflict reconstruction and development. Buried explosive devices can also negatively affect the environment directly, such as through contamination of soil, and indirectly, by denying access to land and other natural resources, which, in turn, results in increased pressure on available resources and unsustainable natural resource management practices. One of the core objectives of mine action is the safe removal and destruction of the remnants of conflict in order to make land safe and accessible, thereby contributing to sustainable development. However, the methods used by mine action organisations can, under certain conditions, represent a risk to the environment, potentially leading to degradation of land through soil degradation, erosion, deforestation and chemical pollution. Mine action organisations, like all humanitarian actors, therefore need to consider...
This paper presents the correlations found between field foliage moisture content measurements, m... more This paper presents the correlations found between field foliage moisture content measurements, meteorological fire danger indices and indices derived from Terra-MODIS satellite images. Both meteorological indices and those derived from MODIS data provide a good estimation of the moisture content of the Mediterranean species sampled. The meteorological subindex of the US system, h1000, as well as the subindex DC (Drought Code) and the final index FWI (Fire Weather Index) of the Canadian system, better estimate fuel moisture content of live fuels. Computed r values between those meteorological indices and gassland moisture content was 0.92, -0.82 y -0.85, respectively. Regarding the dead fuels the best estimations were found for the h1 moisture code (one of the subindices of the US NFDRS system). Concerning those indices derived from MODIS data, the best estimations of moisture content were observed for the Site Moisture (SM), the normalized vegetation index (NDVI) and vegetation ind...
La mayor parte de los estudios de teledeteccion y severidad del fuego actualmente disponibles est... more La mayor parte de los estudios de teledeteccion y severidad del fuego actualmente disponibles estan basados en ajustes empiricos, apoyados en parcelas de campo tomadas poco despues del incendio (Cocke et al., 2005; Epting et al., 2005; Miller and Yool, 2002; van Wagtendonk et al., 2004). Los modelos empiricos son relativamente sencillos de calcular, pero tienen poca capacidad de generalizacion, ya que consideran las condiciones locales donde se ajusto el modelo. Por esta razon, planteamos como objetivo general de esta tesis doctoral desarrollar una metodologia alternativa a los estudios empiricos, que fuera semi-automatica y generalizable de cara a estimar los niveles de severidad a corto plazo a partir de datos de satelite. La metodologia propuesta se basa en el uso de modelos de simulacion de transferencia radiativa (RTM), que intentan estimar la reflectividad procedente de una determinada cubierta a partir una serie de asunciones fisicas (Jacquemoud et cubierta a partir una serie...
Recommended Citation Valencia, Salomé; Desantis, Angela; Wilson, Matt; Tovar Jaramillo, Sebastián... more Recommended Citation Valencia, Salomé; Desantis, Angela; Wilson, Matt; Tovar Jaramillo, Sebastián; Cortés Sánchez, Angela Patricia; and Jaimes Alfonso, Ana Jaquelin (2020) "Explosive Ordnance Victims and Risk Education: Lessons Learned from Colombia 2012-2019," The Journal of Conventional Weapons Destruction: Vol. 24 : Iss. 2 , Article 17. Available at: https://commons.lib.jmu.edu/cisr-journal/vol24/iss2/17
This issue brief illustrates several possible applications of geographic information systems (GIS... more This issue brief illustrates several possible applications of geographic information systems (GIS) in mine action. By producing visual, quantifiable results, GIS tools can help country programme managers, regional office managers, operations managers, operations officers and IMSMA officers make improved decisions. By integrating data from various sources and domains, GIS opens demining processes (eg prioritisation and tasking, demining capacity assessment, operational planning etc) to a wide range of relevant geospatial factors. With these models, transportation network connectivity, soil characteristics, vegetation, slope and other factors that have significant influence on demining activities are better taken into account. More generally, a wide range of environmental, socio-economic and cultural specificities of mine-affected regions can be integrated, significantly improving the evidence and understanding on which managers can base their decisions. This issue brief is illustrate...
espanolLa severidad del fuego es un elemento clave para la estimacion de los efectos a medio y la... more espanolLa severidad del fuego es un elemento clave para la estimacion de los efectos a medio y largo plazo de los incendios forestales y consecuentemente para la prevision de la evolucion ecologica de las areas quemadas. Generalmente la severidad se evalua en campo (a corto o medio plazo) o mediante ajustes empiricos a partir de imagenes de satelite, apoyados en parcelas de campo tomadas justo despues del incendio. Pero, debido la escasa representatividad espacial del primer metodo y a la dificil generalizacion del segundo, se ha propuesto como alternativa el empleo de modelos de simulacion (RTM). Los RTM estiman la reflectividad a partir de asunciones fisicas y resultan ser mas precisos que los metodos empiricos tradicionales. En este estudio la severidad se ha estimado a partir de dos modelos de simulacion PROSPECT y GeoSail. El modelo desarrollado se ha aplicado a imagenes de cinco distintos sensores espaciales (SPOT HR, Landsat TM, AWIFS, MERIS y MODIS), sobre la misma area de e...
International Journal of Remote Sensing
Global and Planetary Change
Remote Sensing of Environment
Remote Sensing of Environment
Environmental disturbance regimes are more frequently being altered by historically novel events ... more Environmental disturbance regimes are more frequently being altered by historically novel events and disturbance interactions, which may trigger reorganizations of new ecosystem states and processes. Here we examine synergies between emerging forest disease and wildfire to determine whether disease outbreak changes environmental drivers of burn severity using sudden oak death and the basin complex fire in California as a case study of novel disturbance interaction. We mapped the spatial distribution of sudden oak death tree mortality using a new object-based filter with 1.0 m resolution KOMPSAT-2 images. We integrated these data with a physical simulation model of burn severity informed by post-fire Landsat data. Model performance varied across stages of disease establishment (early, middle and late) with stronger relationships occurring during later stages of disease progression. Multiscale statistical analysis of environmental drivers of burn severity in diseased compared to healthy forests showed that sudden oak death tree mortality altered relationships between burn severity and the biophysical environment. Specifically, compared to the healthy forests, those affected by disease exhibited higher landscape heterogeneity at smaller spatial scales (e.g., 25 and 50m), which has been associated with decreased burn severity in the literature. Our results showed the opposite pattern. That is, a disease-affected landscape comprising less connected patches and higher patch shape complexity was more likely to experience greater burn severity. This suggests that diseasecaused increases in surface fuels may have reduced the landscape"s resistance to fire and in turn increased burn severity in forest patches neighboring disease-impacted forests.
Revista De Teledeteccion Revista De La Asociacion Espanola De Teledeteccion, 2008
Recursos Rurais Revista Oficial Do Instituto De Biodiversidade Agraria E Desenvolvemento Rural, 2009
Resumen La cartografía y discriminación de áreas quemadas por incendios forestales constituye una... more Resumen La cartografía y discriminación de áreas quemadas por incendios forestales constituye una fuente de información clave para las tareas de gestión post-incendio. La teledetección ha demostrado ser una herramienta cada vez más operativa para desempeñar este tipo de trabajo. Este artículo reúne y explica las últimas aplicaciones y técnicas de teledetección usadas para la cartografía de área quemada centrándose en aspectos de viabilidad espectral, escala y precisión.
Journal of Conventional Weapons Destruction, 2021
El presente trabajo ha sido realizado en el marco del proyecto “Ecologia espacio-temporal y teled... more El presente trabajo ha sido realizado en el marco del proyecto “Ecologia espacio-temporal y teledeteccion de malas hierbas en cultivos de maiz” AGL2005-06180-C03-01 financiado por el Ministerio de Ciencia e Innovacion.
Revista de Teledetección, 2017
Wildfires destroy thousands of hectares of vegetation every year in Chile, a phenomenon that has ... more Wildfires destroy thousands of hectares of vegetation every year in Chile, a phenomenon that has steadily increased over time, both in terms of the number of fires and the area affected. Since 1985 until 2016 have occurred 1,476 wildfires severe in intensity (> 200 ha), that burned a total of about 1,243,407 ha of vegetation, and an average of 40,000 ha affected per year. Depending on the type and intensity of the fire, there are different levels of severity with which the fire affects the vegetation, a variation that is crucial for the estimation GEI in the event. The purpose of this research was to analyze the burn severity of Rufina wildfires occurred in 1999, in the VI Region of L. G. B. O’Higgins in Chile, south of the capital Santiago, using Landsat 5 TM and Landsat 7 ETM+ imagery, including in the analysis the estimated greenhouse gases emitted in relation to with the vegetation and burn severity. Burn severity was estimated through the Normalized Burn Ratio (dNBR) and GEI...
... Department of Geography, University of Alcalá, Calle Colegios 2, 28801 Alcalá de Henares (Mad... more ... Department of Geography, University of Alcalá, Calle Colegios 2, 28801 Alcalá de Henares (Madrid-Spain), angela.desantis@uah.es, marta.yebra@uah ... Laboratory radiometry experimentation at leaf level was performed with Cork oak (Quercus suber) (a Mediterranean ...
... METHODOLOGY Quercus ilex SPECIFIC LUT Marta Yebra, Angela De Santis and Emilio Chuvieco Depar... more ... METHODOLOGY Quercus ilex SPECIFIC LUT Marta Yebra, Angela De Santis and Emilio Chuvieco Department of Geography. University of Alcalá. Madrid. Spain. ... Journal of Geophysical Research - Biosciences, 111. Yebra, M., Chuvieco, E., & Riaño, D. (2007). ...
La cartografia y discriminacion de areas quemadas por incendios forestales constituye una fuente ... more La cartografia y discriminacion de areas quemadas por incendios forestales constituye una fuente de informacion clave para las tareas de gestion post-incendio. La teledeteccion ha demostrado ser una herramienta cada vez mas operativa para desempenar este tipo de trabajo. Este articulo reune y explica las ultimas aplicaciones y tecnicas de teledeteccion usadas para la cartografia de area quemada centrandose en aspectos de viabilidad espectral, escala y precision.
Contamination from remnants of conflict is a legacy of many armed conflicts, threatening human se... more Contamination from remnants of conflict is a legacy of many armed conflicts, threatening human security and impeding post-conflict reconstruction and development. Buried explosive devices can also negatively affect the environment directly, such as through contamination of soil, and indirectly, by denying access to land and other natural resources, which, in turn, results in increased pressure on available resources and unsustainable natural resource management practices. One of the core objectives of mine action is the safe removal and destruction of the remnants of conflict in order to make land safe and accessible, thereby contributing to sustainable development. However, the methods used by mine action organisations can, under certain conditions, represent a risk to the environment, potentially leading to degradation of land through soil degradation, erosion, deforestation and chemical pollution. Mine action organisations, like all humanitarian actors, therefore need to consider...
This paper presents the correlations found between field foliage moisture content measurements, m... more This paper presents the correlations found between field foliage moisture content measurements, meteorological fire danger indices and indices derived from Terra-MODIS satellite images. Both meteorological indices and those derived from MODIS data provide a good estimation of the moisture content of the Mediterranean species sampled. The meteorological subindex of the US system, h1000, as well as the subindex DC (Drought Code) and the final index FWI (Fire Weather Index) of the Canadian system, better estimate fuel moisture content of live fuels. Computed r values between those meteorological indices and gassland moisture content was 0.92, -0.82 y -0.85, respectively. Regarding the dead fuels the best estimations were found for the h1 moisture code (one of the subindices of the US NFDRS system). Concerning those indices derived from MODIS data, the best estimations of moisture content were observed for the Site Moisture (SM), the normalized vegetation index (NDVI) and vegetation ind...
La mayor parte de los estudios de teledeteccion y severidad del fuego actualmente disponibles est... more La mayor parte de los estudios de teledeteccion y severidad del fuego actualmente disponibles estan basados en ajustes empiricos, apoyados en parcelas de campo tomadas poco despues del incendio (Cocke et al., 2005; Epting et al., 2005; Miller and Yool, 2002; van Wagtendonk et al., 2004). Los modelos empiricos son relativamente sencillos de calcular, pero tienen poca capacidad de generalizacion, ya que consideran las condiciones locales donde se ajusto el modelo. Por esta razon, planteamos como objetivo general de esta tesis doctoral desarrollar una metodologia alternativa a los estudios empiricos, que fuera semi-automatica y generalizable de cara a estimar los niveles de severidad a corto plazo a partir de datos de satelite. La metodologia propuesta se basa en el uso de modelos de simulacion de transferencia radiativa (RTM), que intentan estimar la reflectividad procedente de una determinada cubierta a partir una serie de asunciones fisicas (Jacquemoud et cubierta a partir una serie...
Recommended Citation Valencia, Salomé; Desantis, Angela; Wilson, Matt; Tovar Jaramillo, Sebastián... more Recommended Citation Valencia, Salomé; Desantis, Angela; Wilson, Matt; Tovar Jaramillo, Sebastián; Cortés Sánchez, Angela Patricia; and Jaimes Alfonso, Ana Jaquelin (2020) "Explosive Ordnance Victims and Risk Education: Lessons Learned from Colombia 2012-2019," The Journal of Conventional Weapons Destruction: Vol. 24 : Iss. 2 , Article 17. Available at: https://commons.lib.jmu.edu/cisr-journal/vol24/iss2/17
This issue brief illustrates several possible applications of geographic information systems (GIS... more This issue brief illustrates several possible applications of geographic information systems (GIS) in mine action. By producing visual, quantifiable results, GIS tools can help country programme managers, regional office managers, operations managers, operations officers and IMSMA officers make improved decisions. By integrating data from various sources and domains, GIS opens demining processes (eg prioritisation and tasking, demining capacity assessment, operational planning etc) to a wide range of relevant geospatial factors. With these models, transportation network connectivity, soil characteristics, vegetation, slope and other factors that have significant influence on demining activities are better taken into account. More generally, a wide range of environmental, socio-economic and cultural specificities of mine-affected regions can be integrated, significantly improving the evidence and understanding on which managers can base their decisions. This issue brief is illustrate...
espanolLa severidad del fuego es un elemento clave para la estimacion de los efectos a medio y la... more espanolLa severidad del fuego es un elemento clave para la estimacion de los efectos a medio y largo plazo de los incendios forestales y consecuentemente para la prevision de la evolucion ecologica de las areas quemadas. Generalmente la severidad se evalua en campo (a corto o medio plazo) o mediante ajustes empiricos a partir de imagenes de satelite, apoyados en parcelas de campo tomadas justo despues del incendio. Pero, debido la escasa representatividad espacial del primer metodo y a la dificil generalizacion del segundo, se ha propuesto como alternativa el empleo de modelos de simulacion (RTM). Los RTM estiman la reflectividad a partir de asunciones fisicas y resultan ser mas precisos que los metodos empiricos tradicionales. En este estudio la severidad se ha estimado a partir de dos modelos de simulacion PROSPECT y GeoSail. El modelo desarrollado se ha aplicado a imagenes de cinco distintos sensores espaciales (SPOT HR, Landsat TM, AWIFS, MERIS y MODIS), sobre la misma area de e...
International Journal of Remote Sensing
Global and Planetary Change
Remote Sensing of Environment
Remote Sensing of Environment
Environmental disturbance regimes are more frequently being altered by historically novel events ... more Environmental disturbance regimes are more frequently being altered by historically novel events and disturbance interactions, which may trigger reorganizations of new ecosystem states and processes. Here we examine synergies between emerging forest disease and wildfire to determine whether disease outbreak changes environmental drivers of burn severity using sudden oak death and the basin complex fire in California as a case study of novel disturbance interaction. We mapped the spatial distribution of sudden oak death tree mortality using a new object-based filter with 1.0 m resolution KOMPSAT-2 images. We integrated these data with a physical simulation model of burn severity informed by post-fire Landsat data. Model performance varied across stages of disease establishment (early, middle and late) with stronger relationships occurring during later stages of disease progression. Multiscale statistical analysis of environmental drivers of burn severity in diseased compared to healthy forests showed that sudden oak death tree mortality altered relationships between burn severity and the biophysical environment. Specifically, compared to the healthy forests, those affected by disease exhibited higher landscape heterogeneity at smaller spatial scales (e.g., 25 and 50m), which has been associated with decreased burn severity in the literature. Our results showed the opposite pattern. That is, a disease-affected landscape comprising less connected patches and higher patch shape complexity was more likely to experience greater burn severity. This suggests that diseasecaused increases in surface fuels may have reduced the landscape"s resistance to fire and in turn increased burn severity in forest patches neighboring disease-impacted forests.
Revista De Teledeteccion Revista De La Asociacion Espanola De Teledeteccion, 2008
Recursos Rurais Revista Oficial Do Instituto De Biodiversidade Agraria E Desenvolvemento Rural, 2009
Resumen La cartografía y discriminación de áreas quemadas por incendios forestales constituye una... more Resumen La cartografía y discriminación de áreas quemadas por incendios forestales constituye una fuente de información clave para las tareas de gestión post-incendio. La teledetección ha demostrado ser una herramienta cada vez más operativa para desempeñar este tipo de trabajo. Este artículo reúne y explica las últimas aplicaciones y técnicas de teledetección usadas para la cartografía de área quemada centrándose en aspectos de viabilidad espectral, escala y precisión.