Cobertura vegetal do Estado de São Paulo: II - Levantamento por fotointerpretação das áreas cobertas com floresta natural e reflorestamento

É apresentado o levantamento por fotoínterpretação da cobertura vegetal de floresta natural e reflorestamento no Estado de São Paulo, Brasil. O trabalho foi feito pelo método estatístico de amostragem sistemática, utilizando-se templetos com sinais indicadores dos pontos a serem examinados. Foram interpretados, para a área do Estado de São Paulo, 915.570 pontos, representando cada um 27,15 ha. A área com floresta natural foi de 3.405.800 ha, e com reflorestamento, de 372.9000 ha, representando respectivamente 13,70% e 1,50% da área total do Estado. The present paper refers to the survey of the vegetal cover characterized as forests and as reforested areas in the State of São Paulo, Brazil. This was obtained directly on mosaics, thourgh photointerpretation, using when necessary the aerial vertical photos from the aerophotogrammetric survey of the State of São Paulo done in 1962. In the characterization of forests, the height and density of the trees were taken into consideration, describing the texture of the type of covers on the photos with sampling of fields. In a similar way this was done for reforested areas, also taking into account the factors of formation of areas covered with trees destined to activities connected with silviculture with uniform characterization in regard to the photographic structure. The work was done by means of a systematic sampling method, using templets indicating points to be examined. For the area of São Paulo, 915,570 points were interpreted, each one representing 27.15 ha. Results obtained were the following; forests 3,405,900 ha and reforested areas 372,900 ha, this corresponding respectively to 13.70 and 1.50% of the total area of the State.