Browsing by Author "Sequeira, Miguel Pinto da Silva Menezes de"
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- Assessing the effectiveness of RapidEye multispectral imagery for vegetation mapping in Madeira Island (Portugal)Publication . Massetti, Andrea; Sequeira, Miguel Pinto da Silva Menezes de; Pupo, Aida Maria Correia de Nóbrega; Figueiredo, Albano; Guiomar, Nuno; Gil, ArturMadeira Island is a biodiversity hotspot due to its high number of endemic/native plant species. In this work we developed and assessed a methodological framework to produce a RapidEye-based vegetation map. Reasonable accuracies were achieved for a 26 categories classification scheme in two different seasons. We tested pixel and object based approaches and the inclusion of a vegetation index band on top of the pre-processed RapidEye bands stack. Object based generally showed to outperform pixel based classification approaches except for linear or highly scattered classes. The addition of a vegetation index to the workflow increased the separability of the Jeffrey-Matusita least separable class pairs, but not necessarily the overall accuracy. The Pontius accuracy assessment highlighted class specific accuracy tradeoffs related to different combinations of the inputs and methods. The approach to be used, in conclusion, should be carefully considered on the basis of the desired result.
- Biossistemática do género Holcus L. (Poaceae)Publication . Sequeira, Miguel Pinto da Silva Menezes de
- Contribution to the flora of the Selvagens archipelago (Portugal) (I)Publication . Sequeira, Miguel Pinto da Silva Menezes de; Góis-Marques, Carlos; Gouveia, Manuela; Zino, Francis; Bairos, Célia; Mesquita, Sandra; Capelo, JorgePlant specimens obtained by the authors from several expeditions to the Selvagens Islands (2004-2021), complemented by the study of herbarium specimens, led to the identification of several new species records for the Selvagens archipelago, namely the taxa currently considered as Canary Islands endemics Trisetaria lapalmae and Polycarpaea divaricata. Other new taxa records for the Selvagens Islands include Convolvulus siculus subsp. elongatus and the grasses Bromus rigidus and Phalaris minor. Notes on Misopates salvagense, Asplenium marinum, Spergularia diandra and Rostraria pumila are also included. Comments on taxa include distribution, ecology, taxonomy, nomenclature, conservation, and historical data. Results are discussed in the light of habitat restoration, following Nicotiana glauca near eradication and rodent eradication. These aspects are also discussed considering the historical evolution of knowledge on the Selvagens vascular flora.
- De Vegetatio Lusitana Notae - IV.: 10. Aditamentos à vegetação da Ilha da MadeiraPublication . Costa, José Carlos; Capelo, Jorge; Jardim, Roberto José Abreu; Sequeira, Miguel Pinto da Silva Menezes de; Rivas-Martínez, Salvador
- Limonium lowei, um novo nome para o endemismo porto-santense Statice pyramidata Lowe (Plumbaginaceae)Publication . Jardim, Roberto José Abreu; Sequeira, Miguel Pinto da Silva Menezes de; Capelo, Jorge; Costa, José Carlos
- Notas do Herbário Florestal do INIAV (LISFA): Fasc. XXXVIIPublication . Capelo, Jorge; Sequeira, Miguel Pinto da Silva Menezes de; Costa, José Carlos; Portela-Pereira, Estevão; Jardim, Roberto José Abreu; Neto, Carlos; Schaefer, Hanno; Espírito-Santo, Dalila; Lousã, Mário; Rivas-Martínez, Salvador
- Sonchus parathalassius J.G. Costa ex R. Jardim & M. Seq., a new species from Porto Santo Island (Madeira Archipelago)Publication . Jardim, Roberto José Abreu; Sequeira, Miguel Pinto da Silva Menezes de
- Subsídios para o conhecimento da flora do Porto SantoPublication . Jardim, Roberto José Abreu; Sequeira, Miguel Pinto da Silva Menezes de