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Desenvolveu-se um metodo digital para medicao de aneis de crescimento na analise de tronco, utilizando fotografia digital de fatias, processamento digital de imagens e sistemas de informacoes geograficas. Trinta fatias de Pinus elliottii, tomadas a diversas alturas no fuste, foram fotografadas com câmera digital ainda na floresta e, depois, transportadas ao laboratorio para execucao de medicao convencional de analise de tronco. O metodo digital consistiu na transferencia das fotos digitais para o computador, na aplicacao de tecnicas de realce de contraste e filtragens e da insercao das imagens das fatias em um sistema de informacoes geograficas. Os poligonos referentes a cada anel foram vetorizados por digitalizacao em tela e as areas correspondentes foram estimadas pela aplicacao de um fator de escala calculado usando-se a regua fotografada junto a cada fatia. Os volumes por idade estimados pelo procedimento convencional para as duas series de dados (manual e digital) apresentaram uma diferenca media de 7%. DIGITAL STEM ANALYSIS: A NEW METHODOLOGY FOR MEASURING GROWTH RINGS Abstract A digital method was developed for the measurement of growth rings in stem analysis using digital photography, digital image processing and geographical information systems. Thirty discs of Pinus elliottii were taken at various heights along the stem and photographed with a digital camera while still at the forest. At the laboratory the discs were measured using the conventional procedure in stem analysis. The digital method consisted of downloading the pictures from the digital camera, applying contrast enhancement techniques and importing images to GIS software, where the polygons corresponding to each ring were drawn through heads-up digitizing. A common ruler photographed in each picture was used to calculate a scale factor, thus allowing the estimation of cross-sectional areas of each growth ring. Volumes per age were estimated using the conventional procedure for both data series (digital and manual) and the average percentage difference between them equaled 7%.

ANÁLISE DE TRONCO DIGITAL: UMA NOVA METODOLOGIA PARA A MEDIÇÃO DE ANÉIS DE CRESCIMENTO