Eileen H. Helmer, PhD - Publications

1999- International Institute of Tropical Forestry USDA Forest Service 
Landscape Ecology, Tropical Forest Ecology, Remote Sensing

44 high-probability publications. We are testing a new system for linking publications to authors. You can help! If you notice any inaccuracies, please sign in and mark papers as correct or incorrect matches. If you identify any major omissions or other inaccuracies in the publication list, please let us know.

Year Citation  Score
2019 Helmer EH, Gerson EA, Baggett LS, Bird BJ, Ruzycki TS, Voggesser SM. Neotropical cloud forests and páramo to contract and dry from declines in cloud immersion and frost Plos One. 14: e0213155. PMID 30995232 DOI: 10.1371/journal.pone.0213155  1
2019 Helmer EH, Gerson EA, Baggett LS, Bird BJ, Ruzycki TS, Voggesser SM. Neotropical cloud forests and páramo to contract and dry from declines in cloud immersion and frost. Plos One. 14: e0213155. PMID 30995232 DOI: 10.1371/journal.pone.0213155  1
2019 Cooper N, Ewert D, Wunderle J, Helmer E, Marra P. Revising the wintering distribution and habitat use of the Kirtland’s warbler using playback surveys, citizen scientists, and geolocators Endangered Species Research. 38: 79-89. DOI: 10.3354/Esr00937  0.01
2019 Liu M, Yang W, Zhu X, Chen J, Chen X, Yang L, Helmer EH. An Improved Flexible Spatiotemporal DAta Fusion (IFSDAF) method for producing high spatiotemporal resolution normalized difference vegetation index time series Remote Sensing of Environment. 227: 74-89. DOI: 10.1016/J.Rse.2019.03.012  0.01
2018 Helmer E, Ruzycki T, Wilson B, Sherrill K, Lefsky M, Marcano-Vega H, Brandeis T, Erickson H, Ruefenacht B. Tropical Deforestation and Recolonization by Exotic and Native Trees: Spatial Patterns of Tropical Forest Biomass, Functional Groups, and Species Counts and Links to Stand Age, Geoclimate, and Sustainability Goals Remote Sensing. 10: 1724. DOI: 10.3390/Rs10111724  0.01
2018 Zhu X, Helmer EH. An automatic method for screening clouds and cloud shadows in optical satellite image time series in cloudy regions Remote Sensing of Environment. 214: 135-153. DOI: 10.1016/J.Rse.2018.05.024  0.01
2017 Gwenzi D, Helmer E, Zhu X, Lefsky M, Marcano-Vega H. Predictions of Tropical Forest Biomass and Biomass Growth Based on Stand Height or Canopy Area Are Improved by Landsat-Scale Phenology across Puerto Rico and the U.S. Virgin Islands Remote Sensing. 9: 123. DOI: 10.3390/Rs9020123  0.01
2016 Banda-R K, Delgado-Salinas A, Dexter KG, Linares-Palomino R, Oliveira-Filho A, Prado D, Pullan M, Quintana C, Riina R, Rodríguez M GM, Weintritt J, Acevedo-Rodríguez P, Adarve J, Álvarez E, ... ... Helmer EH, et al. Plant diversity patterns in neotropical dry forests and their conservation implications. Science (New York, N.Y.). 353: 1383-1387. PMID 27708031 DOI: 10.1126/Science.Aaf5080  1
2016 Zhu X, Helmer EH, Gao F, Liu D, Chen J, Lefsky MA. A flexible spatiotemporal method for fusing satellite images with different resolutions Remote Sensing of Environment. 172: 165-177. DOI: 10.1016/J.Rse.2015.11.016  1
2014 Erickson HE, Helmer EH, Brandeis TJ, Lugo AE. Controls on fallen leaf chemistry and forest floor element masses in native and novel forests across a tropical island Ecosphere. 5. DOI: 10.1890/Es13-00263.1  1
2014 Kennedy RE, Andréfouët S, Cohen WB, Gómez C, Griffiths P, Hais M, Healey SP, Helmer EH, Hostert P, Lyons MB, Meigs GW, Pflugmacher D, Phinn SR, Powell SL, Scarth P, et al. Bringing an ecological view of change to landsat-based remote sensing Frontiers in Ecology and the Environment. 12: 339-346. DOI: 10.1890/130066  1
2014 Fleming GM, Wunderle JM, Ewert DN, O'Brien JJ, Helmer EH. Functional attributes of two subtropical shrubs and implications for the distribution and management of endangered bird habitat Journal of Plant Ecology. 8: 578-592. DOI: 10.1093/Jpe/Rtu036  1
2013 Martinuzzi S, Lugo AE, Brandeis TJ, Helmer EH. Case Study: Geographic Distribution and Level of Novelty of Puerto Rican Forests Novel Ecosystems: Intervening in the New Ecological World Order. 81-87. DOI: 10.1002/9781118354186.ch9  1
2012 Larkin CC, Kwit C, Wunderle JM, Helmer EH, Stevens MHH, Roberts MTK, Ewert DN. Disturbance type and plant successional communities in Bahamian dry forests Biotropica. 44: 10-18. DOI: 10.1111/J.1744-7429.2011.00771.X  1
2012 Helmer EH, Ruzycki TS, Benner J, Voggesser SM, Scobie BP, Park C, Fanning DW, Ramnarine S. Detailed maps of tropical forest types are within reach: Forest tree communities for Trinidad and Tobago mapped with multiseason Landsat and multiseason fine-resolution imagery Forest Ecology and Management. 279: 147-166. DOI: 10.1016/J.Foreco.2012.05.016  1
2012 Lugo AE, Helmer EH, Valentín ES. Caribbean landscapes and their biodiversity Interciencia. 37: 705-710.  1
2010 Wunderle JM, Currie D, Helmer EH, Ewert DN, White JD, Ruzycki TS, Parresol B, Kwit C. Kirtland's Warblers in anthropogenically disturbed early-successional habitats on Eleuthera, the Bahamas Condor. 112: 123-137. DOI: 10.1525/Cond.2010.090134  1
2010 Helmer EH, Ruzycki TS, Wunderle JM, Vogesser S, Ruefenacht B, Kwit C, Brandeis TJ, Ewert DN. Mapping tropical dry forest height, foliage height profiles and disturbance type and age with a time series of cloud-cleared Landsat and ALI image mosaics to characterize avian habitat Remote Sensing of Environment. 114: 2457-2473. DOI: 10.1016/J.Rse.2010.05.021  1
2009 Helmer EH, Lefsky MA, Roberts DA. Biomass accumulation rates of Amazonian secondary forest and biomass of old-growth forests from Landsat time series and the Geoscience Laser Altimeter System Journal of Applied Remote Sensing. 3. DOI: 10.1117/1.3082116  1
2009 Brandeis TJ, Helmer EH, Marcano-Vega H, Lugo AE. Climate shapes the novel plant communities that form after deforestation in Puerto Rico and the U.S. Virgin Islands Forest Ecology and Management. 258: 1704-1718. DOI: 10.1016/J.Foreco.2009.07.030  1
2008 Woodcock CE, Allen R, Anderson M, Belward A, Bindschadler R, Cohen W, Gao F, Goward SN, Helder D, Helmer E, Nemani R, Oreopoulos L, Schott J, Thenkabail PS, Vermote EF, et al. Free access to Landsat imagery. Science (New York, N.Y.). 320: 1011. PMID 18497274 DOI: 10.1126/Science.320.5879.1011A  1
2008 Sherrill KR, Laituri MJ, Helmer EH, Ramirez JA, Blanco JF, Hein K, Pike AS. Road and stream network connectivity and potential: northeastern Puerto Rico, an exploratory analysis Hydrology and Earth System Sciences Discussions. 5: 1731-1763. DOI: 10.5194/Hessd-5-1731-2008  0.01
2008 Helmer EH, Kennaway TA, Pedreros DH, Clark ML, Marcano-Vega H, Tieszen LL, Ruzycki TR, Schill SR, Carrington CMS. Land cover and forest formation distributions for St. Kitts, Nevis, St. Eustatius, Grenada and Barbados from decision tree classification of cloud-cleared satellite imagery Caribbean Journal of Science. 44: 175-198. DOI: 10.18475/Cjos.V44I2.A6  1
2008 Ruefenacht B, Finco MV, Nelson MD, Czaplewski R, Helmer EH, Blackard JA, Holden GR, Lister AJ, Salajanu D, Weyermann D, Winterberger K. Conterminous U.S. and Alaska forest type mapping using forest inventory and analysis data Photogrammetric Engineering and Remote Sensing. 74: 1379-1388. DOI: 10.14358/Pers.74.11.1379  1
2008 Kennaway TA, Helmer EH, Lefsky MA, Brandeis TA, Sherrill KR. Mapping land cover and estimating forest structure using satellite imagery and coarse resolution lidar in the Virgin Islands Journal of Applied Remote Sensing. 2. DOI: 10.1117/1.3063939  1
2008 Helmer EH, Brandeis TJ, Lugo AE, Kennaway T. Factors influencing spatial pattern in tropical forest clearance and stand age: Implications for carbon storage and species diversity Journal of Geophysical Research: Biogeosciences. 113. DOI: 10.1029/2007Jg000568  1
2008 Blackard JA, Finco MV, Helmer EH, Holden GR, Hoppus ML, Jacobs DM, Lister AJ, Moisen GG, Nelson MD, Riemann R, Ruefenacht B, Salajanu D, Weyermann DL, Winterberger KC, Brandeis TJ, et al. Mapping U.S. forest biomass using nationwide forest inventory data and moderate resolution information Remote Sensing of Environment. 112: 1658-1677. DOI: 10.1016/J.Rse.2007.08.021  1
2007 Helmer EH, Ruefenacht B. Correction after posting / Correction après diffusion A comparison of radiometric normalization methods when filling cloud gaps in Landsat imagery Canadian Journal of Remote Sensing. 33: 457-458. DOI: 10.5589/m07-909  0.01
2007 Kennaway T, Helmer EH. The forest types and ages cleared for land development in Puerto Rico Giscience and Remote Sensing. 44: 356-382. DOI: 10.2747/1548-1603.44.4.356  1
2007 Helmer EH, Ruefenacht B. A comparison of radiometric normalization methods when filling cloud gaps in Landsat imagery Canadian Journal of Remote Sensing. 33: 325-340.  1
2005 Helmer EH, Ruefenacht B. Cloud-free satellite image mosaics with regression trees and histogram matching Photogrammetric Engineering and Remote Sensing. 71: 1079-1089. DOI: 10.14358/Pers.71.9.1079  1
2004 Helmer EH. Forest conservation and land development in Puerto Rico Landscape Ecology. 19: 29-40. DOI: 10.1023/B:Land.0000018364.68514.Fb  1
2004 Lugo AE, Helmer E. Emerging forests on abandoned land: Puerto Rico's new forests Forest Ecology and Management. 190: 145-161. DOI: 10.1016/J.Foreco.2003.09.012  1
2003 Grau HR, Aide TM, Zimmerman JK, Thomlinson JR, Helmer E, Zou X. The Ecological Consequences of Socioeconomic and Land-Use Changes in Postagriculture Puerto Rico Bioscience. 53: 1159-1168. DOI: 10.1641/0006-3568(2003)053[1159:Tecosa]2.0.Co;2  1
2003 Chinea JD, Helmer EH. Diversity and composition of tropical secondary forests recovering from large-scale clearing: Results from the 1990 inventory in Puerto Rico Forest Ecology and Management. 180: 227-240. DOI: 10.1016/S0378-1127(02)00565-0  1
2003 Daly C, Helmer EH, Quinones M. Mapping the climate of Puerto Rico, Vieques and Culebra International Journal of Climatology. 23: 1359-1381. DOI: 10.1002/Joc.937  1
2002 Helmer EH, Ramos O, López TDM, Quinones M, Diaz W. Mapping the forest type and land cover of Puerto Rico, a component of the Caribbean biodiversity hotspot Caribbean Journal of Science. 38: 165-183.  1
2000 Helmer EH, Brown S, Cohen WB. Mapping montane tropical forest successional stage and land use with multi-date Landsat imagery International Journal of Remote Sensing. 21: 2163-2183. DOI: 10.1080/01431160050029495  1
2000 Helmer EH. The landscape ecology of tropical secondary forest in montane Costa Rica Ecosystems. 3: 98-114. DOI: 10.1007/S100210000013  1
1998 Cohen WB, Fiorella M, Gray J, Helmer E, Anderson K. An efficient and accurate method for mapping forest clearcuts in the Pacific Northwest using Landsat imagery Photogrammetric Engineering and Remote Sensing. 64: 293-300.  1
1997 Cairns MA, Brown S, Helmer EH, Baumgardner GA. Root biomass allocation in the world's upland forests. Oecologia. 111: 1-11. PMID 28307494 DOI: 10.1007/S004420050201  1
1997 Cairns MA, Brown S, Helmer EH, Baumgardner GA. Root biomass allocation in the world's upland forests Oecologia. 111: 1-11. DOI: 10.1007/s004420050201  1
1990 Helmer EH, Urban NR, Eisenreich SJ. Aluminum geochemistry in peatland waters Biogeochemistry. 9: 247-276. DOI: 10.1007/BF00000601  1
1985 Karr JR, Heidinger RC, Helmer EH. Effects of chlorine and ammonia from wastewater treatment facilities on biotic integrity Journal of the Water Pollution Control Federation. 57: 912-915.  1
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