@InProceedings{AmaralShimValeAher:1997:ReFoTr,
               author = "Amaral, Silvana and Shimabukuro, Yosio Edemir and Valeriano, 
                         Dalton de Morisson and Ahern, Frank J",
                title = "Relation between forest and tropical and microwave remote sensing 
                         parameters at Tapajos National Forest in Brazilian Amazon",
                 year = "1997",
         organization = "Simp{\'o}sio Latino-Americano de Percepcion Remota, 8.",
             keywords = "ESTUDOS INTEGRADOS DO MEIO AMBIENTE, FLORESTA NACIONAL DE TAPAJOS 
                         (PA), FLORESTAS, PROJETO PRORADAR, RADARSAT, MAPEADOR TEMATICO 
                         (LANDSAT), INDICE DE AREA FOLIAR, LANDSAT 5, INDICE DE VEGETACAO 
                         DA DIFERENCA NORMALIZADA.",
             abstract = "This paper presentes the relation between remote sensing and 
                         forest parameters obtained for two forest types at Tapajos 
                         National Forest, Par6 state, Brazil. It in part of the activities 
                         developed in the PRORADAR project, a INPE/CCRS cooperation, to 
                         evaluate RADARSAT capabilities for forest applications. The study 
                         area comprises the Tapaj6s National Forest, located between the 
                         coordinates of 55' 30' and 54' 36' west Longitude and 2' 30' and 
                         40 18' south Latitude, south of Santarem city (Para state), 
                         Brazilian Amazon. Despite of several ongoing research projects in 
                         this study area, the National Forest is under a management 
                         program(Brazilian Institute of Renewable Resources - IBAMA)to 
                         explore its forest resources. Tropical Dense Forest, with abundant 
                         economic wood species, dominates the two principal 
                         geornorphological regions: Amazon Low Plateaus and Xingu and 
                         Tapaj6s High Plateaus. Forest parameters such as height (H), 
                         diameter at breast height (DBH)for emergent trees(trees with DBH 
                         bigger than 40 cm), and the relative Leaf Area Index (LAI)for each 
                         stand were measured. Radar Backscattering of RADARSAT fine mode 
                         images and Normalized Difference Vegetation Index (NDVI)and 
                         Reflectance values of LANDSAT 5 - TM constituted the remoting 
                         sensing parameters. Height, DBH and LAI measurements were taken 
                         from two different vegetation types at Tapajos National Forest, in 
                         October 1996. For each vegetation type analyzed, two sample areas 
                         were surveyed: one along 6 transects of 400 m and another along 3 
                         transects of 200 m. LAI values were measured using LAI-2000 
                         (LICOR). The forest measurements ewre positioned with a GPS 
                         reference on the field and imported into a GIS. A sernivariogram 
                         analysis was performed to evaluate the spatial relation between 
                         LAI measurements. It was obtained an average distance of 50 m from 
                         which the LAI measurements were not related to each other. The 
                         LAI, DBH and height values were used to generate a regular grid of 
                         the same spatial resolution as the remote sensing finest 
                         resolution (12.5 m x 12.5 m)Frorn the grid values, the average 
                         values of 50m x 50m were computed. LANDSAT 5 - TM image, acquired 
                         on July 08, 1996, was orthocorrected to the cartographic 
                         projection of the field work data and resampled to 12.5 m spatial 
                         resolution. For each sampled area, LANDSAT 5 TM, channels 3, 4, 
                         and 5 digital values were extracted, and NIDVI values were 
                         computed from channels 3 and 4. Four RADARSAT fine mode images, 
                         with different incidence angles (F2D and F5D), acquired in May and 
                         October 1996, were calibrated and ortho-corrected. They were 
                         resampled to the same pixel size as TM and Field data. The 
                         blackscattering values (Gamma nought)related to each sampled area 
                         were extracted and the average values (50m x 50m), 10 dB units 
                         were computed. Remote sensing variables were generally more 
                         correlated to height instead of LAI measurements, which can be 
                         assigned to the dossel structure variation. Medium correlation was 
                         obtained for RAIDARSAT fine mode (F2D)and channel 3 TM. The other 
                         resoults from correlation and multivariate regression between 
                         forest and remote sensing parameters were presented and 
                         discussed.",
  conference-location = "Merida, VE",
      conference-year = "02-07 nov. 1997",
                label = "8397",
         organisation = "SELPER",
           targetfile = "INPE 7077.pdf",
        urlaccessdate = "28 abr. 2024"
}