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作者:Pedro Pina , Sandra Heleno ...
来源:[J].Science of the Total Environment(IF 3.258), 2020, Vol.704Elsevier
摘要:Abstract(#br)Mapping accurately vegetation surfaces in space and time in the ice-free areas of Antarctica can provide important information to quantitatively describe the evolution of their ecosystems. Spaceborne remote sensing is the adequate way to map and evaluate multitempora...
作者:... Carla Mora , Pedro Pina , Carlos E.R. Schaefer
来源:[J].Geomorphology(IF 2.552), 2014, Vol.225, pp.69-75Elsevier
摘要:Abstract(#br)Usnea sp. formations show a spatial distribution coinciding with wind-exposed locations on rock knobs or sedimentary bodies, while they are commonly absent from concave sites. Field collection of georeferenced ground truthing data in the Meseta Norte (Fildes Pen...
作者:Pedro Pina , Gonçalo Vieira ...
来源:[J].Science of the Total Environment(IF 3.258), 2018, Vol.615, pp.1574-1583Elsevier
摘要:Abstract(#br)The main objective of this paper is to verify the accuracy of delineating and characterizing ice-wedge polygonal networks with features exclusively extracted from remotely sensed images of very high resolution. This kind of mapping plays a key role for quantifyi...
作者:Pedro Pina , Gonçalo Vieira ...
来源:[J].Science of the Total Environment(IF 3.258), 2016, Vol.573, pp.290-302Elsevier
摘要:Abstract(#br)The ice-free areas of Maritime Antarctica show complex mosaics of surface covers, with wide patches of diverse bare soils and rock, together with various vegetation communities dominated by lichens and mosses. The microscale variability is difficult to characterize a...
作者:Thiago Statella , Pedro Pina , Erivaldo Antônio da Silva
来源:[J].Icarus(IF 3.161), 2015, Vol.250, pp.43-52Elsevier
摘要:Abstract(#br)We have developed a method to compute the albedo contrast between dust devil tracks and their surrounding regions on Mars. It is mainly based on Mathematical Morphology operators and uses all the points of the edges of the tracks to compute the values of the alb...
作者:Thiago Statella , Pedro Pina , Erivaldo Antônio da Silva
来源:[J].Aeolian Research(IF 2.52), 2016, Vol.20, pp.1-6Elsevier
摘要:Abstract(#br)Studying dust devils is important to better understand Mars climate and resurfacing phenomena. This paper presents an automated approach to calculate the width of tracks in orbital images. The method is based on Mathematical Morphology and was applied to a set of 200...
作者:Pedro Pina , Luı́s Ribeiro , Fernando Muge
来源:[J].Computers and Geosciences(IF 1.834), 2001, Vol.27 (9), pp.1061-1069Elsevier
摘要:Abstract(#br)In order to study groundwater flow and contaminant transport it is important to model the aquifer heterogeneities in terms of the spatial distribution of its hydrostratigraphic units. These units can vary strongly in thickness and can also be geometrically anisotropi...
作者:Pedro Pina , José Saraiva ...
来源:[J].Planetary and Space Science(IF 2.109), 2008, Vol.56 (15), pp.1919-1924Elsevier
摘要:Abstract(#br)Detailed examination of large extensions of polygonal terrains on the surface of Mars and extraction of some characteristic geometric and topological parameters is made possible by the application of image analysis methods to scenes of the Martian surface acquir...
作者:Pedro Pina , Lourenço Bandeira
来源:[J].Advances in Space Research(IF 1.183), 2014, Vol.53 (12), pp.1798-1809Elsevier
摘要:Abstract(#br)In a large majority of lunar and planetary surface images, impact craters are the most abundant geological features. Therefore, it is not surprising that crater detection algorithms (CDAs) are one of the most studied subjects of image processing and analysis in ...
作者:Thiago Statella , Pedro Pina , Erivaldo Antônio da Silva
来源:[J].Advances in Space Research(IF 1.183), 2014, Vol.53 (12), pp.1822-1833Elsevier
摘要:Abstract(#br)The paper presents and evaluates three methods for automatically estimating the main orientation of Martian dust devil tracks in MOC and HiRISE images. Inferring such information about dust devils from their tracks is important to better understand the near surface w...

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