Avaliação temporal por NDVI em ambientes naturais na área de preservação ambiental do Rio Pandeiros/MG

• Ano de defesa: 2012
• Autor(a) principal: Diego de Sousa Ribeiro Fonseca
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: APA; Bacia hidrográfica; rio São Francisco; Série temporal; NDVI; Ciências Agrárias
• Link de acesso: http://hdl.handle.net/1843/NCAP-94AGAD

Cartography is a science that has long been used to the study and representation of environmental phenomena. From 1970, as environmental management techniques were being refined, there was the development and use of new cartographic technologies. Through the application of these resources, the objective of this study is to evaluate the cerrado, vereda, hydromorphic soil, várzeas (wetlands) and water bodies in the Preservation Area of Pandeiros River, using a time series of satellite images during the rainy and dry seasons of the year 1990, 2000 and 2010, due to high elevations of the land. The methodology consisted of the acquisition of LANDSAT satellite imagery 5/TM; radiometric calibration and atmospheric correction of the bands of near-infrared and visible; generation, survey and assembly of a database containing values of the vegetation index (NDVI) for the physiognomies studied; and manipulation of radar data. The means of NDVI indicate the recovery of cerrado physiognomies, vereda and várzea along the studied periods, with the first and last showing more vigor during periods of rain. The areas of hydromorphic soil showed no significant differences in relation to the years. In the areas of water bodies there was fickleness of values, which indicates imbalance and disturbance. Depending on the altitude ranges, the physiognomy of the cerrado type presented greater force of vegetation at elevations between 440 and 539m. From the year 2000 on, it was recorded the largest vigor in the physiognomy vereda type at elevations between 539 and 747m. For areas of hydromorphic soil, there was more vigor in the interval between 539 and 632m. Due to the fragility and importance of APA ecosystems of Pandeiros River, constant monitoring is essential to this environment. With this intention, the use of Geotechnologies for acquisition, processing and analysis of information makes the diagnosis more complete and incisive on the possibilities of generating a catalog of historical phenomena, which can guide to the mitigation of impact and the conservation of the environment through prognostics.