Centre for Earth Observation Sciences (CEOS)

Dr. Arturo Sánchez-Azofeifa, Director

Associate Dean, Faculty of Science,
    International and Graduate Affairs Office
Director, Center for Earth Observation Sciences (CEOS)
Professor, Earth and Atmospheric Sciences Department
Office: (780) 492-1822, Fax: (780) 492-2030

E-mail: arturo.sanchez@ualberta.ca

Links

Education

  • University of New Hampshire, Ph.D. Earth Sciences, 1996
  • University of New Hampshire, M.Sc. Hydrology, 1993 
  • Universidad de Costa Rica, Licensee in Civil Engineering, 1990
  • Universidad Autonoma de Centro America, Bachelor of Science in Civil Engineering, 1987

Research Interests

Dr. Sánchez-Azofeifa's research is related to the study of impacts of land use/cover change (LUCC) on biodiversity loss and habitat fragmentation in tropical dry forest environments. He uses remote sensing and geographic information systems to evaluate 1) the effectiveness of protected areas (National Parks and Biological Reserves) and 2) Payment of Environmental Services schemes to control tropical deforestation in Mesoamerica. His research also involves the study of theoretical linkages between remote sensing (multispectral and hyperspectral) and the spatio/temporal dynamics of Leaf Area Index (LAI), Primary Productivity (PP), Photosynthetic Active Radiation (PAR) and B-diversity in tropical secondary dry forests. In addition, his research interests involve the development of techniques for the analysis and interpretation of the presence of non-self supporting tropical systems (lianas) and tropical hardwood species (e.g. Mahogany) at the leaf and canopy level using hyperspectral remote sensing data bases. In 2009, Dr. Sánchez-Azofeifa's research work entered the top 1% in the field of Environment & Ecology in Essential Science Indicators from Thomson Reuters.

Publications

2012

Alvarez-Anorve, M. Y., Quesada, M., Sanchez-Azofeifa, G. A., Avila-Cabadilla, L. D., & Gamon, J. A. (2012). Functional Regeneration and Spectral Reflectance of Trees During Succession in a Highly Diverse Tropical Dry Forest Ecosystem. American Journal of Botany, 99(5), 816-826.

Avila-Cabadilla, L. D., Sanchez-Azofeifa, G. A., Stoner, K. E., Alvarez-Anorve, M. Y., Quesada, M., & Portillo-Quintero, C. A. (2012). Local and Landscape Factors Determining Occurrence of Phyllostomid Bats in Tropical Secondary Forests. Plos One, 7(4).

Avila-Flores, R., Ceballos, G., de Villa-Meza, A., List, R., Marce, E., Pacheco, J., et al. (2012). Factors associated with long-term changes in distribution of black-tailed prairie dogs in northwestern Mexico. Biological Conservation, 145(1), 54-61.

Castillo, M., Rivard, B., Sanchez-Azofeifa, A., Calvo-Alvarado, J., & Dubayah, R. (2012). LIDAR remote sensing for secondary Tropical Dry Forest identification. Remote Sensing of Environment, 121, 132-143.

Coelho, M. S., Almada, E. D., Quintino, A. V., Fernandes, G. W., Santos, R. M., Arturo Sanchez-Azofeifa, G., et al. (2012). Floristic composition and structure of a tropical dry forest at different successional stages in the Espinhaco Mountains, southeastern Brazil. Interciencia, 37(3), 190-196.

Hesketh, M., & Sanchez-Azofeifa, G. A. (2012). The effect of seasonal spectral variation on species classification in the Panamanian tropical forest. Remote Sensing of Environment, 118, 73-82.

Sanchez-Azofeifa, A., Oki, Y., Wilson Fernandes, G., Ball, R. A., & Gamon, J. (2012). Relationships between endophyte diversity and leaf optical properties.Trees-Structure and Function, 26(2), 291-299.

2011

Book Chapter (fully refereed)

GA Sanchez-Azofeifa and C Portillo-Quintero. "Extent and drivers of change of neotropical seasonally dry tropical forests". In Seasonally Tropical Dry Forests: Ecology and Conservation. Editors R Dirzo, HS Young, HA Mooney and G Ceballos. Island Press (2010): 45-58.

Refereed Journal Articles

Castillo-Nunez, M., G. A. Sanchez-Azofeifa, A. Croitoru, B. Rivard, J. Calvo-Alvarado, and R. O. Dubayah. 2011. Delineation of secondary succession mechanisms for tropical dry forests using LiDAR. Remote Sensing of Environment 115 (9):2217-2231.

Cheng, T., B. Rivard, and A. Sanchez-Azofeifa. 2011. Spectroscopic determination of leaf water content using continuous wavelet analysis. Remote Sensing of Environment 115 (2):659-670.

Fernandes, G.W., Y. Oki, and G. A. Sanchez-Azofeifa. Accepted for publication June 2011. Hail impact on leaves and endophytes of the endemic threatened Coccoloba cereifera (Polygonaceae).Plant Ecology In Press.

McKellar, R.C., A.P. Wolfe, K. Muehlenbachs, R. Tappert, M.S. Engel, T. Cheng, and G.A. Sanchez-Azofeifa. 2011. Insect outbreaks produce distinctive carbon isotope signatures in defensive resins and fossiliferous ambers. Proceedings of the Royal Society B-Biological Sciences 0962-8452.

Pastorello, G. Z., G. A. Sanchez-Azofeifa, and M. A. Nascimento. 2011. Enviro-Net: From Networks of Ground-Based Sensor Systems to a Web Platform for Sensor Data Management. Sensors 11 (6):6454-6479.

Sanchez-Azofeifa, A., B. Rivard, J. Wright, J. L. Feng, P. J. Li, M. M. Cheng, and S. A. Bohlman. 2011. Estimation of the Distribution of Tabebuia guayacan (Bignoniaceae) Using High-Resolution Remote Sensing Imagery. Sensors 11 (4):3831-3851.

2010

Cheng, T., B. Rivard, G. A. Sanchez-Azofeifa, J. Feng, and M. Calvo-Polanco. 2010. Continuous wavelet analysis for the detection of green attack damage due to mountain pine beetle infestation. Remote Sensing of Environment 114 (4):899-910.

Feng, J., B. Rivard, A. Gallie, and G.A. Sanchez-Azofeifa. 2010. Rock type classification of drill core using continuous wavelet analysis applied to thermal infrared reflectance spectra. International Journal of Remote Sensing (accepted for publication July 2009). In Press

Gamon, J. A., C. Coburn, L. B. Flanagan, K. F. Huemmrich, C. Kiddle, G. A. Sanchez-Azofeifa, D. R. Thayer, L. Vescovo, D. Gianelle, D. A. Sims, A. F. Rahman, and G. Z. Pastorello. 2010. SpecNet revisited: bridging flux and remote sensing communities.Canadian Journal of Remote Sensing 36:S376-S390.

Neves, F. D., V. H. F. Oliveira, M. M. do Espirito-Santo, F. Z. Vaz-de-Mello, J. Louzada, A.Sanchez-Azofeifa, and G. W. Fernandes. 2010. Successional and Seasonal Changes in a Community of Dung Beetles (Coleoptera: Scarabaeinae) in a Brazilian Tropical Dry Forest. Natureza & Conservacao 8 (2):160-164.

Neves, F. S., L. S. Araujo, M. M. Espirito-Santo, M. Fagundes, G. W. Fernandes, G. A.Sanchez-Azofeifa, and M. Quesada. 2010. Canopy Herbivory and Insect Herbivore Diversity in a Dry Forest-Savanna Transition in Brazil. Biotropica 42 (1):112-118.

Neves, F. S., R. F. Braga, M. M. do Espirito-Santo, J. H. C. Delabie, G. W. Fernandes, and G. A.Sanchez-Azofeifa. 2010. Diversity of Arboreal Ants In a Brazilian Tropical Dry Forest: Effects Of Seasonality and Successional Stage. Sociobiology 56 (1):177-194.

Portillo-Quintero, C. A., and G. A. Sanchez-Azofeifa. 2010. Extent and conservation of tropical dry forests in the Americas. Biological Conservation 143 (1):144-155.

Spring, D., J. Baum, R. Mac Nally, M. MacKenzie, A. Sanchez-Azofeifa, and J. R. Thomson. 2010. Building a Regionally Connected Reserve Network in a Changing and Uncertain World. Conservation Biology 24 (3):691-700.

2009

Calvo-Alvarado, J., B. McLennan, A. Sanchez-Azofeifa, and T. Garvin. 2009. Deforestation and forest restoration in Guanacaste, Costa Rica: Putting conservation policies in context. Forest Ecology and Management 258 (6):931-940.

Coelho, M. S., E. D. Almada, G. W. Fernandes, M. A. A. Carneiro, R. M. dos Santos, A. V. Quintino, and A. Sanchez-Azofeifa. 2009. Gall inducing arthropods from a seasonally dry tropical forest in Serra do Cipo, Brazil. Revista Brasileira De Entomologia 53 (3):404-414.

Espirito-Santo, M. M., A. C. Sevilha, F. C. Anaya, R. Barbosa, G. W. Fernandes, G. A. Sanchez-Azofeifa, A. Scariot, S. E. de Noronha, and C. A. Sampaio. 2009. Sustainability of tropical dry forests: Two case studies in southeastern and central Brazil. Forest Ecology and Management 258 (6):922-930.

Gamon, J. A., C. Coburn, L. B. Flanagan, K. F. Huemmrich, C. Kiddle, G. A. Sanchez-Azofeifa, D. R. Thayer, L. Vescovo, D. Gianelle, D. A. Sims, A. F. Rahman, and G. Z. Pastorello. 2010. SpecNet revisited: bridging flux and remote sensing communities.Canadian Journal of Remote Sensing 36:S376-S390.

Kalacska, M. E., L. S. Bell, G. Sanchez-Azofeifa, and T. Caelli. 2009. The Application of Remote Sensing for Detecting Mass Graves: An Experimental Animal Case Study from Costa Rica. Journal of Forensic Sciences 54 (1):159-166.

Madeira, B., M. M. Espirito-Santo, S. D. Neto, Y. R. F. Nunes, G. A. S. Azofeifa, G. W. Fernandes, and M. Quesada. 2009. Changes in tree and liana communities along a successional gradient in a tropical dry forest in south-eastern Brazil. Plant Ecology 201 (1):291-304.

McDermid, G. J., R. J. Hall, G. A. Sanchez-Azofeifa, S. E. Franklin, G. B. Stenhouse, T. Kobliuk, and E. F. LeDrew. 2009. Remote sensing and forest inventory for wildlife habitat assessment. Forest Ecology and Management 257 (11):2262-2269.

Pfaff, A., J. Robalino, G. A. Sanchez-Azofeifa, K. S. Andam, and P. J. Ferraro. 2009. Park Location Affects Forest Protection: Land Characteristics Cause Differences in Park Impacts across Costa Rica. B E Journal of Economic Analysis & Policy 9 (2):26.

Quesada, M., G. A. Sanchez-Azofeifa, M. Alvarez-Anorve, K. E. Stoner, L. Avila-Cabadilla, J. Calvo-Alvarado, A. Castillo, M. M. Espirito-Santo, M. Fagundes, G. W. Fernandes, J. Gamon, M. Lopezaraiza-Mikel, D. Lawrence, L. P. C. Morellato, J. S. Powers, F. D. Neves, V. Rosas-Guerrero, R. Sayago, and G. Sanchez-Montoya. 2009. Succession and management of tropical dry forests in the Americas: Review and new perspectives.Forest Ecology and Management 258 (6):1014-1024.

Rivard, B, J Zhang, J Feng, and GA Sanchez-Azofeifa. 2009. Remote predictive lithologic mapping in the Abitibi Greenstone Belt, Canada, using airborne hyperspectral imagery.Canadian Journal of Remote Sensing:S95-S105.

Rivard, B., J. Zhang, J. Feng, and G. A. Sanchez-Azofeifa. 2009. Remote predictive lithologic mapping in the Abitibi Greenstone Belt, Canada, using airborne hyperspectral imagery.Canadian Journal of Remote Sensing 35:S95-S105.

Sanchez-Azofeifa, G. A., K. Castro, S. J. Wright, J. Gamon, M. Kalacska, B. Rivard, S. A. Schnitzer, and J. L. Feng. 2009. Differences in leaf traits, leaf internal structure, and spectral reflectance between two communities of lianas and trees: Implications for remote sensing in tropical environments. Remote Sensing of Environment 113 (10):2076-2088.

Sanchez-Azofeifa, G. A., K. L. Castro-Esau, W. A. Kurz, and A. Joyce. 2009. Monitoring carbon stocks in the tropics and the remote sensing operational limitations: from local to regional projects. Ecological Applications 19 (2):480-494.

Sanchez-Azofeifa, G. A., M. Kalacska, M. M. do Espirito-Santo, G. W. Fernandes, and S. Schnitzer. 2009. Tropical dry forest succession and the contribution of lianas to wood area index (WAI). Forest Ecology and Management 258 (6):941-948.

Sanchez-Azofeifa, G. A., M. Quesada, P. Cuevas-Reyes, A. Castillo, and G. Sanchez-Montoya. 2009. Land cover and conservation in the area of influence of the Chamela-Cuixmala Biosphere Reserve, Mexico. Forest Ecology and Management 258 (6):907-912.

Sanchez-Azofeifa, GA, K Castro, SJ Wright, J Gamon, M Kalacska, B Rivard, SA Schnitzer, and JL Feng. 2009. Differences in leaf traits, leaf internal structure, and spectral reflectance between two communities of lianas and trees: Implications for remote sensing in tropical environments. Remote Sensing of Environment:2076-2088.

Stoner, K. E., and G. A. Sanchez-Azofeifa. 2009. Ecology and regeneration of tropical dry forests in the Americas: Implications for management. Forest Ecology and Management 258 (6):903-906.

 

2008

Andam, K. S., P. J. Ferraro, A. Pfaff, G. A. Sanchez-Azofeifa, and J. A. Robalino. 2008. Measuring the effectiveness of protected area networks in reducing deforestation.Proceedings of the National Academy of Sciences of the United States of America 105 (42):16089-16094.

Calvo-Alvarado, Julio C., Margaret Kalacska, G. Arturo Sanchez-Azofeifa, and Lynne S. Bell. 2008. Effect of soil type on plant growth, leaf nutrient/chlorophyll concentration, and leaf reflectance of tropical tree and grass species. Hyperspectral Remote Sensing of Tropical and Sub-Tropical Forests:87-123.

Kalacska, M, GA Sanchez-Azofeifa, B Rivard, JC Calvo-Alvarado, and M Quesada. 2008. Baseline assessment for environmental services payments from satellite imagery: A case study from Costa Rica and Mexico. Journal of Environmental Management:348-359.

Rivard, B, J Feng, A Gallie, and A Sanchez-Azofeifa. 2008. Continuous wavelets for the improved use of spectral libraries and hyperspectral data. Remote Sensing of Environment:2850-2862.

Rivard, Benoit, G. Arturo Sanchez-Azofeifa, Sheri Foley, and Julio C. Calvo-Alvarado. 2008. Species classification of tropical tree leaf reflectance and dependence on selection of spectral bands. Hyperspectral Remote Sensing of Tropical and Sub-Tropical Forests:141-159.

 

2007

Kalacska, M, GA Sanchez-Azofeifa, B Rivard, T Caelli, HP White, and JC Calvo-Alvarado. 2007. Ecological fingerprinting of ecosystem succession: Estimating secondary tropical dry forest structure and diversity using imaging spectroscopy. Remote Sensing of Environment:82-96.

Pounds, J. A., M. R. Bustamante, L. A. Coloma, J. A. Consuegra, M. P. L. Fogden, P. N. Foster, E. La Marca, K. L. Masters, A. Merino-Viteri, R. Puschendorf, S. R. Ron, G. A.Sanchez-Azofeifa, C. J. Still, and B. E. Young. 2007. Ecology - Pounds et al. reply.Nature 447 (7144):E5-E6.

Rogge, DM, B Rivard, J Zhang, A Sanchez, J Harris, and J Feng. 2007. Integration of spatial-spectral information for the improved extraction of endmembers. Remote Sensing of Environment:287-303.

Sanchez-Azofeifa, G. A., A. Pfaff, J. A. Robalino, and J. P. Boomhower. 2007. Costa Rica's payment for environmental services program: Intention, implementation, and impact.Conservation Biology 21 (5):1165-1173.

Wright, S. J., G. A. Sanchez-Azofeifa, C. Portillo-Quintero, and D. Davies. 2007. Poverty and corruption compromise tropical forest reserves. Ecological Applications 17 (5):1259-1266.

2006

Castro-Esau, K. L., G. A. Sanchez-Azofeifa, B. Rivard, S. J. Wright, and M. Quesada. 2006. Variability in leaf optical properties of Mesoamerican trees and the potential for species classification. American Journal of Botany 93 (4):517-530.

Castro-Esau, KL, GA Sanchez-Azofeifa, and B Rivard. 2006. Comparison of spectral indices obtained using multiple spectroradiometers. Remote Sensing of Environment:276-288.

Castro-Esau, KL, GA Sanchez-Azofeifa, B Rivard, SJ Wright, and M Quesada. 2006.f Variability in leaf optical properties of Mesoamerican trees and the potential for species classification. American Journal of Botany:517-530.

Feng, JL, B Rivard, EA Gallie, and A Sanchez. 2006. Quantifying total sulfide content of cores and cut-rock surfaces using thermal infrared reflectance. Geophysics:M1-M9.

Foley, S, B Rivard, GA Sanchez-Azofeifa, and J Calvo. 2006. Foliar spectral properties following leaf clipping and implications for handling techniques. Remote Sensing of Environment:265-275.

Jensen, O. C., and G. A. S. Azofeifa. 2006. Satellite-derived ecosystems classification: image segmentation by ecological region for improved classification accuracy, a boreal case study. International Journal of Remote Sensing 27 (2):233-251.

Morisette, J. T., F. Baret, J. L. Privette, R. B. Myneni, J. E. Nickeson, S. Garrigues, N. V. Shabanov, M. Weiss, R. A. Fernandes, S. G. Leblanc, M. Kalacska, G. A. Sanchez-Azofeifa, M. Chubey, B. Rivard, P. Stenberg, M. Rautiainen, P. Voipio, T. Manninen, A. N. Pilant, T. E. Lewis, J. S. Iiames, R. Colombo, M. Meroni, L. Busetto, W. B. Cohen, D. P. Turner, E. D. Warner, G. W. Petersen, G. Seufert, and R. Cook. 2006. Validation of global moderate-resolution LAI products: A framework proposed within the CEOS Land Product Validation subgroup. Ieee Transactions on Geoscience and Remote Sensing 44 (7):1804-1817.

Pounds, J. A., M. R. Bustamante, L. A. Coloma, J. A. Consuegra, M. P. L. Fogden, P. N. Foster, E. La Marca, K. L. Masters, A. Merino-Viteri, R. Puschendorf, S. R. Ron, G. A.Sanchez-Azofeifa, C. J. Still, and B. E. Young. 2006. Widespread amphibian extinctions from epidemic disease driven by global warming. Nature 439 (7073):161-167.

Sanchez-Azofeifa, G. A., and K. Castro-Esau. 2006. Canopy observations on the hyperspectral properties of a community of tropical dry forest lianas and their host trees. International Journal of Remote Sensing 27 (9-10):2101-2109.

Schelhas, J., and G. A. Sanchez-Azofeifa. 2006. Post-frontier forest change adjacent to Braulio Carrillo National Park, Costa Rica. Human Ecology 34 (3):407-431.

Zhang, J. K., B. Rivard, A. Sanchez-Azofeifa, and K. Castro-Esau. 2006. Intra and inter-class spectral variability of tropical tree species at La Selva, Costa Rica: Implications for species identification using HYDICE imagery. Remote Sensing of Environment 105 (2):129-141.

Zhang, JK, B Rivard, A Sanchez-Azofeifa, and K Castro-Esau. 2006. Intra and inter-class spectral variability of tropical tree species at La Selva, Costa Rica: Implications for species identification using HYDICE imagery. Remote Sensing of Environment:129-141.

2005

Arroyo-Mora, J. P., G. A. Sanchez-Azofeifa, M. E. R. Kalacska, B. Rivard, J. C. Calvo-Alvarado, and D. H. Janzen. 2005. Secondary forest detection in a neotropical dry forest landscape using Landsat 7 ETM+ and IKONOS imagery. Biotropica 37 (4):497-507.

Arroyo-Mora, J. P., G. A. Sanchez-Azofeifa, B. Rivard, J. C. Calvo, and D. H. Janzen. 2005. Dynamics in landscape structure and composition for the Chorotega region, Costa Rica from 1960 to 2000. Agriculture Ecosystems & Environment 106 (1):27-39.

Arroyo-Mora, JP, GA Sanchez-Azofeifa, MER Kalacska, B Rivard, JC Calvo-Alvarado, and DH Janzen. 2005. Secondary forest detection in a neotropical dry forest landscape using Landsat 7 ETM+ and IKONOS imagery. Biotropica:497-507.

Arroyo-Mora, JP, GA Sanchez-Azofeifa, B Rivard, JC Calvo, and DH Janzen. 2005. Dynamics in landscape structure and composition for the Chorotega region, Costa Rica from 1960 to 2000. Agriculture Ecosystems & Environment:27-39.

Das, B, RD Vinebrooke, A Sanchez-Azofeifa, B Rivard, and AP Wolfe. 2005. Inferring sedimentary chlorophyll concentrations with reflectance spectroscopy: a novel approach to reconstructing historical changes in the trophic status of mountain lakes. Canadian Journal of Fisheries and Aquatic Sciences:1067-1078.

Kachmar, M, GA Sanchez-Azofeifa, B Rivard, and Y Kakubari. 2005. Improved forest cover classification in an industrialized mountain area in Japan. Mountain Research and Development:349-356.

Kalacska, M, A Sanchez-Azofeifa, T Caelli, B Rivard, and B Boerlage. 2005. Estimating leaf area index from satellite imagery using Bayesian networks. Ieee Transactions on Geoscience and Remote Sensing:1866-1873.

Kalacska, M., J. C. Calvo-Alvarado, and G. A. Sanchez-Azofeifa. 2005. Calibration and assessment of seasonal changes in leaf area index of a tropical dry forest in different stages of succession. Tree Physiology 25 (6):733-744.

Kalacska, M. E. R., G. A. Sanchez-Azofeifa, J. C. Calvo-Alvarado, B. Rivard, and M. Quesada. 2005. Effects of season and successional stage on leaf area index and spectral vegetation indices in three mesoamerican tropical dry forests. Biotropica 37 (4):486-496.

Kalacska, MER, GA Sanchez-Azofeifa, JC Calvo-Alvarado, B Rivard, and M Quesada. 2005. Effects of season and successional stage on leaf area index and spectral vegetation indices in three mesoamerican tropical dry forests. Biotropica:486-496.

Sanchez-Azofeifa, G. A., M. Quesada, J. P. Rodriguez, J. M. Nassar, K. E. Stoner, A. Castillo, T. Garvin, E. L. Zent, J. C. Calvo-Alvarado, M. E. R. Kalacska, L. Fajardo, J. A. Gamon, and P. Cuevas-Reyes. 2005. Research priorities for neotropical dry forests. Biotropica37 (4):477-485.

Zhang, JK, B Rivard, and A Sanchez-Azofeifa. 2005. Spectral unmixing of normalized reflectance data for the deconvolution of lichen and rock mixtures. Remote Sensing of Environment:57-66.

2004

Bechtel, R, A Sanchez-Azofeifa, and B Rivard. 2004. Associations between Woodland Caribou telemetry data and Landsat TM spectral reflectance. International Journal of Remote Sensing:4813-4827.

Feng, JL, B Rivard, EA Gallie, A Sanchez-Azofeifa, and H Francis. 2004. Rock-type identification in a simulated underground environment using second-derivative thermal infrared reflectance spectra. Geological Society of America Bulletin:1318-1326.

Kalacska, M, GA Sanchez-Azofeifa, JC Calvo-Alvarado, M Quesada, B Rivard, and DH Janzen. 2004. Species composition, similarity and diversity in three successional stages of a seasonally dry tropical forest. Forest Ecology and Management:227-247.

Kalacska, M, GA Sanchez-Azofeifa, B Rivard, and JC Calvo-Alvarado. 2004. Estimation of transition function parameters to evaluate the sensitivity of vegetation indices to leaf area index in a tropical moist forest. 2003 Ieee Workshop on Advances in Techniques For Analysis of Remotely Sensed Data:173-174.

Kalacska, M, GA Sanchez-Azofeifa, B Rivard, JC Calvo-Alvarado, ARP Journet, JP Arroyo-Mora, and D Ortiz-ortiz. 2004. Leaf area index measurements in a tropical moist forest: A case study from Costa Rica. Remote Sensing of Environment:134-152.

Kalacska, M., G. A. Sanchez-Azofeifa, J. C. Calvo-Alvarado, M. Quesada, B. Rivard, and D. H. Janzen. 2004. Species composition, similarity and diversity in three successional stages of a seasonally dry tropical forest. Forest Ecology and Management 200 (1-3):227-247.

Pfaff, A. S. P., and G. A. Sanchez-Azofeifa. 2004. Deforestation pressure and biological reserve planning: a conceptual approach and an illustrative application for Costa Rica.Resource and Energy Economics 26 (2):237-254.

Van Laake, P. E., and G. A. Sanchez-Azofeifa. 2004. Focus on deforestation: zooming in on hot spots in highly fragmented ecosystems in Costa Rica. Agriculture Ecosystems & Environment 102 (1):3-15.

Zhang, JK, B Rivard, and A Sanchez-Azofeifa. 2004. Derivative spectral unmixing of hyperspectral data applied to mixtures of lichen and rock. Ieee Transactions on Geoscience and Remote Sensing:1934-1940.

2003

Bechtel, R, A Sanchez-Azofeifa, and B Rivard. 2004. Associations between Woodland Caribou telemetry data and Landsat TM spectral reflectance. International Journal of Remote Sensing:4813-4827.

Feng, JL, B Rivard, EA Gallie, A Sanchez-Azofeifa, and H Francis. 2004. Rock-type identification in a simulated underground environment using second-derivative thermal infrared reflectance spectra. Geological Society of America Bulletin:1318-1326.

Kalacska, M, GA Sanchez-Azofeifa, JC Calvo-Alvarado, M Quesada, B Rivard, and DH Janzen. 2004. Species composition, similarity and diversity in three successional stages of a seasonally dry tropical forest. Forest Ecology and Management:227-247.

Kalacska, M, GA Sanchez-Azofeifa, B Rivard, and JC Calvo-Alvarado. 2004. Estimation of transition function parameters to evaluate the sensitivity of vegetation indices to leaf area index in a tropical moist forest. 2003 Ieee Workshop on Advances in Techniques For Analysis of Remotely Sensed Data:173-174.

Kalacska, M, GA Sanchez-Azofeifa, B Rivard, JC Calvo-Alvarado, ARP Journet, JP Arroyo-Mora, and D Ortiz-ortiz. 2004. Leaf area index measurements in a tropical moist forest: A case study from Costa Rica. Remote Sensing of Environment:134-152.

Kalacska, M., G. A. Sanchez-Azofeifa, J. C. Calvo-Alvarado, M. Quesada, B. Rivard, and D. H. Janzen. 2004. Species composition, similarity and diversity in three successional stages of a seasonally dry tropical forest. Forest Ecology and Management 200 (1-3):227-247.

Pfaff, A. S. P., and G. A. Sanchez-Azofeifa. 2004. Deforestation pressure and biological reserve planning: a conceptual approach and an illustrative application for Costa Rica.Resource and Energy Economics 26 (2):237-254.

Van Laake, P. E., and G. A. Sanchez-Azofeifa. 2004. Focus on deforestation: zooming in on hot spots in highly fragmented ecosystems in Costa Rica. Agriculture Ecosystems & Environment 102 (1):3-15.

Zhang, JK, B Rivard, and A Sanchez-Azofeifa. 2004. Derivative spectral unmixing of hyperspectral data applied to mixtures of lichen and rock. Ieee Transactions on Geoscience and Remote Sensing:1934-1940.

2002

Bechtel, R, B Rivard, and A Sanchez-Azofeifa. 2002. Spectral properties of foliose and crustose lichens based on laboratory experiments. Remote Sensing of Environment:389-396.

Sanchez-Azofeifa, G. A., B. Rivard, J. Calvo, and I. Moorthy. 2002. Dynamics of tropical deforestation around national parks: Remote sensing of forest change on the Osa Peninsula of Costa Rica. Mountain Research and Development 22 (4):352-358.

Sanchez-Azofeifa, GA, B Rivard, J Calvo, and I Moorthy. 2002. Dynamics of tropical deforestation around national parks: Remote sensing of forest change on the Osa Peninsula of Costa Rica. Mountain Research and Development:352-358.

 

2001 and prior

Daily, G. C., P. R. Ehrlich, and G. A. Sanchez-Azofeifa. 2001. Countryside biogeography: Use of human-dominated habitats by the avifauna of southern Costa Rica. Ecological Applications 11 (1):1-13.

Sanchez-Azofeifa, G. A., R. C. Harriss, and D. L. Skole. 2001. Deforestation in Costa Rica: a quantitative analysis using remote sensing imagery. Biotropica 33 (3):378-384.

Pfaff, A. S. P., S. Kerr, R. F. Hughes, S. G. Liu, G. A. Sanchez-Azofeifa, D. Schimel, J. Tosi, and V. Watson. 2000. The Kyoto protocol and payments for tropical forest: An interdisciplinary method for estimating carbon-offset supply and increasing the feasibility of a carbon market under the CDM. Ecological Economics 35 (2):203-221.

Carlson, T. N., and G. A. Sanchez-Azofeifa. 1999. Satellite remote sensing of land use changes in and around San Jose, Costa Rica. Remote Sensing of Environment 70 (3):247-256.

Sanchez-Azofeifa, G. A., C. Quesada-Mateo, P. Gonzalez-Quesada, S. Dayanandan, and K. S. Bawa. 1999. Protected areas and conservation of biodiversity in the tropics.Conservation Biology 13 (2):407-411.

Sanchez-Azofeifa, G. A., L. S. Skole, and W. Chomentowski. 1997. Sampling global deforestation data bases: the role of persistence. Mitigation and Adaptation Strategies for Climate Change 2(2–3):177–189

Sanchez-Azofeifa, G. A., and C. Quesadamateo. 1995. Deforestation, carbon dynamics, and sustainable mitigation measures in Costa-Rica - the Puerto-Viejo-de-Sarapiqui case-study. Interciencia 20 (6):396.