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@Article{MuņozValeBisp:2013:SuToHe,
               author = "Muņoz, Viviana Aguilar and Valeriano, M{\'a}rcio de Morisson and 
                         Bispo, Polyanna da Concei{\c{c}}{\~a}o",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Surveying the topographic height from SRTM data for canopy mapping 
                         in Brazilian Pantanal",
              journal = "Geografia (Rio Claro)",
                 year = "2013",
               volume = "38",
                pages = "139--155",
                 note = "{Setores de Atividade: Pesquisa e desenvolvimento 
                         cient{\'{\i}}fico.}",
             keywords = "vegeta{\c{c}}{\~a}o natural, levantamento, geomorfometria, 
                         sensoriamento remoto, SRTM.",
             abstract = "An algorithm was developed in Geographical Information Systems 
                         (GIS) for the extraction of topographic height from the Digital 
                         Elevation Models (DEM) of the Shuttle Radar Topography Mission 
                         (SRTM), C and X bands, applied to mapping vegetation canopy in the 
                         Pantanal Floodlands. According to previous studies, these bands 
                         are sensitive to surface vegetation and thus elevation values 
                         increase in relation to terrain proportional to the height of the 
                         canopy, known as canopy effect. The proposed algorithm identifies 
                         minimum elevations within a search radius, which are likely to 
                         represent bare earth values, to generate a reference surface. The 
                         topographic height results from the subtraction between the 
                         elevations of this surface and of the original DEM. It is expected 
                         that, in this region, the height values be related to the 
                         vegetation height. Whenever possible, the algorithm results were 
                         observed together with optical images and vegetation maps of 
                         RADAMBRASIL project, for the establishment of height slicing 
                         levels as related to vegetal groups. The visual examination and 
                         statistical analysis have provided three levels of slicing height, 
                         which would be related to herbaceous, shrub and tree (forest) 
                         vegetation communities. Although slicing levels could be related 
                         to general classes of vegetation canopy in this region, field data 
                         and, or, fine resolution optical data are required for more 
                         detailed mappings. Regardless of the classification approach, 
                         height estimates from SRTM DEM represent a subsidiary data for the 
                         remote characterization of the Pantanal Floodlands vegetation, 
                         which complements traditionally used optical data.",
                 issn = "0100-7912 and 1983-8700",
                label = "lattes: 8678564148136140 2 MuņozValeBisp:2013:SuToHe",
             language = "en",
        urlaccessdate = "25 jan. 2021"
}


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