Survey of Selmun promontory, northern Malta, 2021

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Dataset Information

These data were collected with a DJI Phantom 4 Pro over the Selmun promontory which is located along the north-eastern coast of Malta, central Mediterranean. In this area, the evident cliff retreat is linked to landslide processes involving the outcropping geological succession, characterized by the over position of stiff limestones on ductile clays. Such an instability process consists of a lateral spreading associated with toppling and fall of different-size rock blocks. Starting from the 3D model obtained from the UAV-photogrammetry, a digital geological-structural survey was performed in which have been identified the spatial geometry of the fractures that characterize the area of the Selmun promontory by measuring strike, dip and dip direction of the fractures with semi-automatic digital tools. The data were produced as part of the doctoral thesis of Dr Emanuele Colica and in support of the European project Interreg V-A Italy-Malta NEWS (Nearshore hazard monitoring and Early Warning System).

opentopoID: OTDS.112021.32633.1
DOI: https://doi.org/10.5069/G9D21VSC
Platform: Structure from Motion / Photogrammetry
Data Format: Point Cloud, Raster
Dataset Acknowledgement: Colica, E., D’Amico, S., Iannucci, R., Martino, S., Gauci, A., Galone, L., ... & Paciello, A. (2021). Using unmanned aerial vehicle photogrammetry for digital geological surveys: case study of Selmun promontory, northern of Malta. Environmental Earth Sciences, 80(17), 1-14.

Colica, E., D’Amico, S., Iannucci, R., Martino, S., Gauci, A., Galone, L., ... & Paciello, A. (2021). Using unmanned aerial vehicle photogrammetry for digital geological surveys: case study of Selmun promontory, northern of Malta. Environmental Earth Sciences, 80(17), 1-14.
Dataset Citation: Colica, E. (2021). Survey of Selmun promontory, northern Malta, 2021. Distributed by OpenTopography. https://doi.org/10.5069/G9D21VSC. Accessed: 2024-07-27
Survey Area: 0.18 km2
Publication Date: 11/29/2021
Number of lidar returns: 72,222,641 pts
Point Density: 394.73 pts/m2
Coordinates System:
Horizontal: WGS 84 / UTM zone 33N [EPSG: 32633]

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Spatial Extent
Point Cloud Extent Raster Extent

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    Point Cloud Data
  File Name Size Points Area (m2) Density  
1     Dense Cloud Selmun 2021.laz     945.67 MB     72,222,641     182,969     394.73         View Detail    
  SpatialReference:
COMPD_CS["unknown",PROJCS["WGS 84 / UTM zone 33N",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",15],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","32633"]],VERT_CS["unknown",VERT_DATUM["unknown",2005],UNIT["metre",1.0,AUTHORITY["EPSG","9001"]],AXIS["Up",UP]]]
Lat/Lon/Elevation Boundary:
North-East (lat,lon,elev): [35.970049596651414, 14.38920769768538, 72.992]
South-West (lat,lon,elev): [35.96601946323314, 14.382446331863832, -6.423]
Coordinates Boundary:
North-East (X,Y): 444929.608, 3980798.939]
South-West (X,Y): 444317.151, 3980355.771]
Classifications:
Class 0 (Created, never classified):     72,222,641
    Raster Data
  File Name Size Resolution Dimensions Layer Type  
1     DEM 5cm-pixel area ridotta Selmun 2021.tif     273.77 MB     0.05 meter     18740 x 12861     Digital Surface Model (DSM)             View Detail    
  SpatialReference:
PROJCS["WGS 84 / UTM zone 33N", GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], TOWGS84[0,0,0,0,0,0,0], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4326"]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",0], PARAMETER["central_meridian",15], PARAMETER["scale_factor",0.9996], PARAMETER["false_easting",500000], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AUTHORITY["EPSG","32633"]]
Lat/Lon Boundary:
North-East (lat,lon) [35.97052247541476, 14.39209069073479]
South-West (lat,lon) [35.96467410285034, 14.381747731818422]
Coordinates Boundary:
North-East (X,Y) [445189.875, 3980849.765]
South-West (X,Y) [444253.214, 3980206.948]
2     Orthomosaic 1.25cm-pixel area ridotta Selmun 2021.tif     1.21 GB     0.01 meter     36127 x 34046     Orthophotograph             View Detail    
  SpatialReference:
PROJCS["WGS 84 / UTM zone 33N", GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], TOWGS84[0,0,0,0,0,0,0], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4326"]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",0], PARAMETER["central_meridian",15], PARAMETER["scale_factor",0.9996], PARAMETER["false_easting",500000], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AUTHORITY["EPSG","32633"]]
Lat/Lon Boundary:
North-East (lat,lon) [35.96988963451641, 14.387825276488794]
South-West (lat,lon) [35.96602861911164, 14.38284858778406]
Coordinates Boundary:
North-East (X,Y) [444804.853, 3980781.978]
South-West (X,Y) [444353.428, 3980356.557]
  Summary 1.48 GB            
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