102 documents found, page 1 of 11
The use of Sentinel 2 to quantify N, Ca, and K in walnut orchards
Mendes, Maria Beatriz; Farinha, Daniela; Oliveira, Pedro; Mota Barroso, João; Rato, Luís Miguel; Sousa, Adélia; Rato, Ana Elisa’Persian walnut’ (Juglans regia L.) is one of the most consumed nut species in the world, and N, K, and Ca nutrition are critical for its growth and quality. Mineral nutrition management in fruit crops over large areas is a challenging task only possible with a remote sensing data approach and using rapid analytical methods to correlate remotely sensed data with ground data. This study aims to develop and valid...
Monitorização e avaliação da produção de milho utilizando tecnologias de Agricu...
Swambo, Hermenegildo; Sousa, Adélia; Marques da Silva, José RafaelEm resposta ao desafio global do crescimento populacional e à necessidade de aumentar a produtividade agrícola para a segurança alimentar, foi realizado um estudo no município da Chibia, Huíla, Angola, numa área de 25 hectares. O objetivo foi utilizar dados de deteção remota para analisar a cultura do milho, validando um modelo que identifica variáveis com impacto na eficiência da produção. A análise correlacio...
Dynamics of biomass evaluated with remote sensing in Pinus pinaster in Portugal
Gonçalves, Ana Cristina; Sousa, AdéliaAbove ground biomass was estimated with an allometric functions with crown projection area on a per area basis, for Pinus pinaster stands in Portugal. The allometric function is a linear function with crown projection area as explanatory variable derived from the vegetation mask of high spatial resolution satellite images. It was attained with contrast split segmentation over normalized different vegetation ind...
Geotechnologies in the identification of areas suitable for the construction of...
Santos de Sousa, Jacqueline; Pontes de Almeida, Gledson; Pandorfi, Heliton; Amilton Santos, José; Montenegro, Abelardo; Marinho, Gessica; Sousa, AdéliaThe Brazilian semiarid region faces water challenges that directly impact its agricultural activities. The municipality of Capoeiras, in Pernambuco, has great productive potential, but depends on sustainable water collection and storage strategies to overcome scarcity and ensure the continuity of local agriculture and livestock farming. Given this scenario, this research was developed with the objective of iden...
Key issues in incorporating proximal and remote sensor data into farm decision-...
Sousa, Adélia; Silva, Rafael; Serrano, João; Shahidian, Shakib; Silveira, Duarte Lobo; Simões, Manuela; Gonçalves, Ana Cristina; Caldinhas, Maria João1 Introduction 2 Proximal sensor calibration and validation: evaluating the Grassmaster II probe to estimate pasture productivity 3 Using remote sensing data to identify management zones in olive groves 4 Using remote sensing data to estimate aboveground forest biomass 5 Assessing the carbon footprint of horticultural crops 6 Assessment of animal welfare using the Aurora app 7 Conclusion and future trends 8 Ref...
Mapping of Forest Species Using Sentinel-2A Images in the Alentejo and Algarve ...
Isbaex, Crismeire; Coelho, Ana Margarida; Gonçalves, Ana Cristina; Sousa, AdéliaLand use and land cover (LULC) studies, particularly those focused on mapping forest species using Sentinel-2 (S2A) data, face challenges in delineating and identifying areas of heterogeneous forest components with spectral similarity at the canopy level. In this context, the main objective of this study was to compare and analyze the feasibility of two classification algorithms, K-Nearest Neighbor (KNN) and Ra...
Performance of machine learning algorithms for forest species classification us...
Coelho, Ana Margarida; Sousa, Adélia; Gonçalves, Ana CristinaRecent advances in remote sensing technologies and the increased availability of high spatial resolution satellite data allow the acquisition of detailed spatial information. These data have been used for monitoring the Earth's surface, namely monitoring land use land cover, quantifying biomass and carbon, and evaluating the protection and conservation of forest areas. O WorldView-3 is a high spatial resolution...
Hyperspectral refrectace as a basis to discriminate olive varieties - a tool fo...
Gomes, Luís; Nobre, Tânia; Sousa, Adélia; Rei, Fernando; Guiomar, NunoWorldwide sustainable development is threatened by current agricultural land change trends, particularly by the increasing rural farmland abandonment and agricultural intensification phenomena. In Mediterranean countries, these processes are a ecting especially traditional olive groves with enormous socio-economic costs to rural areas, endangering environmental sustainability and biodiversity. Traditional olive...
Utilização de dados do satélite Sentinel-2e de espectroscopia NIR para a quanti...
Mendes, Maria Beatriz; Farinha, Daniela; Sousa, Adélia; Barroso, João Manuel; Peixe, Augusto; Rato, Luis Miguel; Dias, António; Rato, Ana ElisaA determinação do teor de nutrientes em culturas agrícolas requer periodicidade na colheita de amostras foliares que serão futuramente analisadas em laboratórios acreditados para o efeito. Desta forma, são disponibilizadas aos agricultores recomendações de fertilização baseadas nos resultados das análises foliares. Este processo é moroso e requer uma recolha representativa das amostras principalmente em parcel...
CARTOGRAFIA DAS ESPÉCIES FLORESTAIS NA REGIÃO DO ALENTEJO UTILIZANDO IMAGENS DE...
Coelho, Ana Margarida; Sousa, Adélia; Gonçalves, Ana CristinaIn Portugal forest occupies 35,8% of the national territory, 23% corresponding to conifers and 64% to broadleaved species. According to the national forest inventory of 2015, the main forest species are eucaliptus (Eucalyptus spp.) representing 26%, cork oak (Quercus suber) and maritime pine (Pinus pinaster) with 22% of the forest area. The soil land use/cover monitoring has a pivotal role in the natural resour...