Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-7/W3, 953-957, 2015
http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/953/2015/
doi:10.5194/isprsarchives-XL-7-W3-953-2015
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
 
30 Apr 2015
AUTOMATIC EXTRACTION OF TIDE-COORDINATED SHORELINE USING OPEN SOURCE SOFTWARE AND LANDSAT IMAGERY
G. Gonçalves1,2, N. Duro3, E. Sousa2,4, and I. Figueiredo2,4 1INESC-Coimbra, Rua Antero de Quental 199, 3000-033 Coimbra, Portugal
2Dept. of Mathematics, University of Coimbra, Portugal
3www.bluecover.pt, Portugal
4CMUC, Apartado 3008, EC Santa Cruz, 3001 - 50, Portugal
Keywords: Landsat, Open source software, instantaneous shoreline, tide-coordinate shoreline, Constrained Delaunay Triangulation Abstract. Due to both natural and anthropogenic causes, the coastal lines keeps changing dynamically and continuously their shape, position and extend over time. In this paper we propose an approach to derive a tide-coordinate shoreline from two extracted instantaneous shorelines corresponding to a nearly low tide and high tide events. First, all the multispectral images are panshaperned to meet the 15 meters spatial resolution of the panchromatic images. Second, by using the Modification of Normalized Difference Water Index (MNDWI) and the kmeans clustering method we extract the raster shoreline for each image acquisition time. Third, each raster shoreline is smoothed and vectorized using a penalized least square method. Fourth, a 2D constrained Delaunay triangulation is built from the two extracted instantaneous shorelines with their respective heights interpolated from a Tidal gauche station. Finally, the desired tide-coordinate shoreline is interpolated from the previous triangular intertidal surface. The results show that an automatic tide-coordinated extraction method can be efficiently implemented using free available remote sensing imagery data (Landsat 8) and open source software (QGIS and Orfeo toolbox) and python scripting for task automation and software integration.
Conference paper (PDF, 7053 KB)


Citation: Gonçalves, G., Duro, N., Sousa, E., and Figueiredo, I.: AUTOMATIC EXTRACTION OF TIDE-COORDINATED SHORELINE USING OPEN SOURCE SOFTWARE AND LANDSAT IMAGERY, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-7/W3, 953-957, doi:10.5194/isprsarchives-XL-7-W3-953-2015, 2015.

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