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|Title: ||Remote Sensing and Digital Databases to Recovery Terrestrial Boundaries in West Africa – Cape Roxo Region|
|Authors: ||Sousa, Adélia|
Melo, Ana Raquel
Nunes, Maria do Carmo
|Issue Date: ||17-May-2015|
|Citation: ||Sousa A., Melo R., Nunes M.C., Cabral A., Costa F. and Morgado A. (2015). Remote Sensing and Digital Databases to Recovery Terrestrial Boundaries in West Africa – Cape Roxo Region. In: Proceedings International Federation of surveyors (FIG) Working Week 2015, Sófia, Bulgária, 16-21 de Maio, 15p.|
|Abstract: ||This case study focuses on borderlands located in Guinea Bissau, more specifically on the
borderland of Cape Roxo region, with a controversial geographic location which have been
raising great interest and several disputes, mainly due to the lack of geographical information.
This study intends to contribute to clarify the problem combining geographical information
and multitemporal analysis to define the exact position of some boundary beacons.
The geographical information used, includes all available data, from old and actual maps and
technical reports to most recent data obtained from new geospatial technologies. Historic and
geographic information, describing the Guinea Bissau boundaries, combined with ancient
aerial photographs (1950-1960) and recent high spatial resolution satellite images (2013),
WorldView-2, are used in a Geographic Information System (GIS) to perform the
The spatial resolution of WorldView-2 images was improved using several pan-sharpening
algorithms to combine multispectral and panchromatic bands in order to obtain a pansharpened
image with higher spatial resolution. This procedure enhances the spatial
information improving the interpretation of terrain features.
Multitemporal analysis detected changes in coastal landforms, in Cape Roxo region, showing
significant shoreline erosion/accretion, a high dynamic lagoon-beach system and relative
stability of the inshore dune, where a boundary beacon is located.|
|Appears in Collections:||ERU - Artigos em Livros de Actas/Proceedings|
MED - Artigos em Livros de Actas/Proceedings
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