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Pelatihan : Techniques in Active Tectonic Study Juni 20-Juli 2, 2013 Instruktur: Prof. J Ramon Arrowsmith (JRA) Dari Arizona State University (ASU) - US.

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Presentation on theme: "Pelatihan : Techniques in Active Tectonic Study Juni 20-Juli 2, 2013 Instruktur: Prof. J Ramon Arrowsmith (JRA) Dari Arizona State University (ASU) - US."— Presentation transcript:

1 Pelatihan : Techniques in Active Tectonic Study Juni 20-Juli 2, 2013 Instruktur: Prof. J Ramon Arrowsmith (JRA) Dari Arizona State University (ASU) - US Tempat Pelaksanaan: Ruang Pangea, Laboratorium Gempabumi (LabEarth) – Puslit Geoteknologi LIPI dan Kuliah lapangan akan dilakukan disekitar Sesar Lembang, Jawa Barat. * Lebih jelas baca TOR/KAK dan daftar acara

2 High resolution topography exercise and discussion

3 Airborne Laser Swath Mapping (ALSM) 1.Laser scanner 2.Inertial Measurement Unit (IMU) 3.GPS -Phillips, UNAVCO

4 R. Haugerud, U.S.G.S D. Harding, NASA Answer science question Gridded products Geodesy and signal processing Point Cloud x n, y n, z n, i n ALSM workflow: Survey->Process->Classify->Interpolate/Grid->Analyze

5 Ecology Applications: 3D vegetation information & interactions between vegetation and topography 3D vegetation structure: –estimation of stand height –total aboveground biomass –foliage biomass –basal area –tree density, –canopy base height –canopy bulk density Stoker et al., 2006

6 Comparisons of Techniques for measuring surfaces and detecting changes in surfaces* GPSInSARALSMTLS Sample Density 1 site/10 km 2 10,000 pixels/ km hits/ m hits/ m 2 Position Precision 1-20 mm2-3 m5-15 cm0.6-5 cm Change Detection 1 mm1-2 cm10 cm1 cm Scale Global100 km Km1 km * Ball park numbers for typical applications -Phillips, Meertens, and Jackson, UNAVCO

7 x,y,z + attributes Filtering algorithms allow classification by return type: –Ground, vegetation, building … LiDAR “point cloud”

8 Digital Elevation Models Digital representation of topography / terrain –“Raster” format – a grid of squares or “pixels” –Continuous surface where Z (elevation) is estimated on a regular X,Y grid –“2.5D” Grid resolution is defined by the size in the horizontal dimension of the pixel – 1 meter DEM has pixels 1 m x 1m assigned a single elevation value. Source:

9 1 meter grid LiDAR returns from EarthScope data collection Example from flat area with little or no vegetation so ground is sampled approx. 5+ times per square meter How do we best fit a continuous surface to these points? Ultimately wish to represent irregularly sampled data on a regularized grid. 1 meter

10 Facilitate community access to high-resolution, Earth science- oriented, topography data, and related tools and resources.

11 Let’s tour OpenTopography

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