Eileen Helmer Ph.D.
Jardín Botánico Sur
1201 Calle Ceiba
San Juan, PR 00926
(970) 498-2644
(970) 498-1212 (Fax)
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Caribbean Vegetation and Land Cover This project conducts remote sensing and landscape ecology research to benefit natural resource sustainability, biodiversity conservation, and disaster management in the Caribbean. Collaborators include the U.S. ... |
Eileen Helmer |
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Optical Remote Sensing in Persistently Cloudy Landscapes This research focuses on methods to addresses the refractory problem of clouds in optical satellite imagery in persistently cloudy, complex tropical landscapes. Current studies are contributing to goals of the Landsat Science Team and the Landsat Data Continuity Mission (LDCM). ... |
Eileen Helmer |
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Caribbean Forest Inventory and Analysis (FIA) Program The Caribbean Forest Inventory and Analysis (FIA) Program produces traditional forest inventories and conducts research in all of the IITF research areas: ecosystems, stand and landscape dynamics, and wildlife biodiversity. The Program is jointly managed by the USFS Southern Research Station and IITF. ... |
Eileen Helmer |
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Neotropical Climate and Biogeography This research focuses on how climate and land-cover changes may affect vegetation and species distributions in complex tropical landscapes. Collaborators include scientists from Oregon State University and Symmetry, Inc. ... |
Eileen Helmer |
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2007 A comparison of radiometric normalization methods when filling cloud gaps in Landsat imagery Mapping persistently cloudy tropical landscapes with optical satellite imagery usually requires assembling the clear imagery from several dates. This study compares methods for normalizing image data when filling cloud gaps in Landsat imagery with imagery from other dates. ... |
Eileen Helmer |
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2002 Mapping the Forest Type and Land Cover of Puerto Rico, a Component of the Caribbean Biodiversity Hotspot The Caribbean is one of the worlds centers of biodiversity and endemism. As in similar regions, many of its islands have complex topography, climate and soils, and ecological zones change over small areas. ... |
Eileen Helmer Maya Quiñones Olga Ramos |
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2004 Emerging forests on abandoned land: Puerto Rico's new forests The species composition of forests change continuously as the earths biota evolves and adjusts to environmental change. Humans are accelerating the rate of species turnover by moving species around the planet and dramatically changing environmental conditions. ... |
Ariel E. Lugo Eileen Helmer |
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2008 Factors influencing spatial pattern in tropical forest clearance and stand age: implications for carbon storage and species diversity Little is known about the tropical forests that undergo clearing as urban/built-up and other developed lands spread. This study uses remote sensing-based maps of Puerto Rico , multinomial logit models and forest inventory data to explain patterns of forest age and the age of forests cleared for land development and assess their implications for forest carbon storage and tree species richness. ... |
Ariel E. Lugo Eileen Helmer |
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2003 The Ecological Consequences of Socioeconomic and Land-Use Changes in Postagriculture Puerto Rico Contrary to the general trend in the tropics, forests have recovered in Puerto Rico from less than 10% ofthe landscape in the late 1940s to more than 40% in the present.The recent Puerto Rican history offorest recovery provides the opportunity to study the ecological consequences of economic globalization, reflected in a shift from agriculture to manufacturing and in human migration from rural to urban areas. ... |
Eileen Helmer |
| View All Publications (20) For This Staff Member... | |
