author = "Cassol, Henrique Luis Godinho and Shimabukuro, Yosio Edemir and 
                         Carreiras, Jo{\~a}o Manuel de Brito and Moraes, Elisabete Caria",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {University of 
                         Sheffield} and {Instituto Nacional de Pesquisas Espaciais 
                title = "Improved tree height estimation of secondary forests in the 
                         Brazilian Amazon",
              journal = "Acta Amazonica",
                 year = "2018",
               volume = "48",
               number = "3",
                pages = "179--190",
                month = "jul./set.",
             keywords = "tree height-diameter (H:DBH) model, nested model, indicative 
                         variable, height growth, ecological species groups.",
             abstract = "This paper presents a novel approach for estimating the height of 
                         individual trees in secondary forests at two study sites: Manaus 
                         (central Amazon) and Santarem (eastern Amazon) in the Brazilian 
                         Amazon region. The approach consists of adjusting tree 
                         height-diameter at breast height (H:DBH) models in each study site 
                         by ecological species groups: pioneers, early secondary, and late 
                         secondary. Overall, the DBH and corresponding height (H) of 1,178 
                         individual trees were measured during two field campaigns: August 
                         2014 in Manaus and September 2015 in Santarem. We tested the five 
                         most commonly used log-linear and nonlinear H:DBH models, as 
                         determined by the available literature. The hyperbolic model: H = 
                         a.DBH/(b+DBH) was found to present the best fit when evaluated 
                         using validation data. Significant differences in the fitted 
                         parameters were found between pioneer and secondary species from 
                         Manaus and Santarem by F-test, meaning that site-specific and also 
                         ecological-group H:DBH models should be used to more accurately 
                         predict H as a function of DBH. This novel approach provides 
                         specific equations to estimate height of secondary forest trees 
                         for particular sites and ecological species groups. The presented 
                         set of equations will allow better biomass and carbon stock 
                         estimates in secondary forests of the Brazilian Amazon.",
                  doi = "10.1590/1809-4392201700844",
                  url = "http://dx.doi.org/10.1590/1809-4392201700844",
                 issn = "0044-5967",
             language = "en",
           targetfile = "cassol_improved.pdf",
        urlaccessdate = "30 nov. 2020"