Point clouds derived from satellite imagery in Changma, China, 2015

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Dataset Information

This dataset contains a ~120 km long section of the Changma Fault which is related to the 1932 Changma Earthquake in China. The point cloud data were derived via photogrammetric methods by Leica Photogrammetry Suite built in ERDAS Imagine from data acquired by Airbus Defence and Space (Pleiades stereo optical imagery).

opentopoID: OTDS.082023.32646.1
DOI: https://doi.org/10.5069/G9SJ1HSG
Platform: Structure from Motion / Photogrammetry
Data Format: Point Cloud
Dataset Acknowledgement: N/A - Acknowledgement Guidance
Dataset Citation: Walker, R. (2023). Point clouds derived from satellite imagery in Changma, China, 2015. Distributed by OpenTopography. https://doi.org/10.5069/G9SJ1HSG Accessed: 2025-07-19
Survey Date: 07/05/2015 - 07/24/2015
Survey Area: 1,080.26 km2
Publication Date: 08/16/2023
Total Number of Points: 1,200,979,863 pts
Point Density: 1.11 pts/m2
Coordinates System:
Horizontal: WGS 84 / UTM zone 46N [EPSG: 32646]

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Spatial Extent

Show Data Files

    Point Cloud
  File Name Size Points Area (m2) Density  
1     changma16_utm46.laz     972.16 MB     180,089,514     186,815,323     0.96         File Metadata    
SpatialReference: 
COMPD_CS["unknown",PROJCS["WGS 84 / UTM zone 46N",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",93],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","32646"]],VERT_CS["IMAGINE GeoTIFF SupportERDAS IMAGINE 2020  16.6.0.1217Unable to match Vertical Coordinate System to a VerticalCSTypeGeoKey valueEllipsoid = WGS 84Datum = WGS 84",VERT_DATUM["unknown",2005],UNIT["metre",1.0,AUTHORITY["EPSG","9001"]],AXIS["Up",UP]]]

Geographic Coordinates (Lat, Lon, Elevation) - EPSG:4326
North-East (Lat, Lon, Elevation): (39.87480914357691, 96.91600934202735, 3294.5)
South-West (Lat, Lon, Elevation): (39.672420282936656, 96.65033045806659, 1995.05)

Projected Coordinates (X, Y) - EPSG:32646
North-East (X, Y): (834925.8758, 4421206.618)
South-West (X, Y): (813114.4888, 4397772.421)

Classifications:
Class 0 (Created, never classified)180,089,514
2     changma2_utm46.laz     974.96 MB     162,823,838     230,251,671     0.71         File Metadata    
SpatialReference: 
COMPD_CS["unknown",PROJCS["WGS 84 / UTM zone 46N",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",93],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","32646"]],VERT_CS["IMAGINE GeoTIFF SupportERDAS IMAGINE 2020  16.6.0.1217Unable to match Vertical Coordinate System to a VerticalCSTypeGeoKey valueEllipsoid = WGS 84Datum = WGS 84",VERT_DATUM["unknown",2005],UNIT["metre",1.0,AUTHORITY["EPSG","9001"]],AXIS["Up",UP]]]

Geographic Coordinates (Lat, Lon, Elevation) - EPSG:4326
North-East (Lat, Lon, Elevation): (39.750263530551166, 97.10606531267011, 3920.2465)
South-West (Lat, Lon, Elevation): (39.62367396605615, 96.85453022790405, 2082.7145)

Projected Coordinates (X, Y) - EPSG:32646
North-East (X, Y): (851821.3814, 4408108.255)
South-West (X, Y): (830867.6084, 4393093.683)

Classifications:
Class 0 (Created, never classified)162,689,381
Class 7 (Low Point (noise))134,457
3     changma3_utm46.laz     927.19 MB     150,166,428     167,562,434     0.9         File Metadata    
SpatialReference: 
COMPD_CS["unknown",PROJCS["WGS 84 / UTM zone 46N",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",93],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","32646"]],VERT_CS["IMAGINE GeoTIFF SupportERDAS IMAGINE 2020  16.6.0.1217Unable to match Vertical Coordinate System to a VerticalCSTypeGeoKey valueEllipsoid = WGS 84Datum = WGS 84",VERT_DATUM["unknown",2005],UNIT["metre",1.0,AUTHORITY["EPSG","9001"]],AXIS["Up",UP]]]

Geographic Coordinates (Lat, Lon, Elevation) - EPSG:4326
North-East (Lat, Lon, Elevation): (39.68011414434672, 97.27191832192936, 4013.404)
South-West (Lat, Lon, Elevation): (39.603875179755256, 97.02255622835766, 2634.5)

Projected Coordinates (X, Y) - EPSG:32646
North-East (X, Y): (866408.747, 4400984.531)
South-West (X, Y): (845393.658, 4391528.827)

Classifications:
Class 0 (Created, never classified)150,082,601
Class 7 (Low Point (noise))83,827
4     changma4_utm46.laz     1.77 GB     282,730,497     220,234,072     1.28         File Metadata    
SpatialReference: 
COMPD_CS["unknown",PROJCS["WGS 84 / UTM zone 46N",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",93],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","32646"]],VERT_CS["IMAGINE GeoTIFF SupportERDAS IMAGINE 2020  16.6.0.1217Unable to match Vertical Coordinate System to a VerticalCSTypeGeoKey valueEllipsoid = WGS 84Datum = WGS 84",VERT_DATUM["unknown",2005],UNIT["metre",1.0,AUTHORITY["EPSG","9001"]],AXIS["Up",UP]]]

Geographic Coordinates (Lat, Lon, Elevation) - EPSG:4326
North-East (Lat, Lon, Elevation): (39.65951977809539, 97.47773426896758, 4349.6005)
South-West (Lat, Lon, Elevation): (39.500452535303644, 97.22104457581175, 2927.2405)

Projected Coordinates (X, Y) - EPSG:32646
North-East (X, Y): (884182.7266, 4399560.237)
South-West (X, Y): (862982.0976, 4380828.092)

Classifications:
Class 0 (Created, never classified)282,619,803
Class 7 (Low Point (noise))110,694
5     changma5_utm46.laz     979.21 MB     165,950,205     160,242,489     1.04         File Metadata    
SpatialReference: 
COMPD_CS["unknown",PROJCS["WGS 84 / UTM zone 46N",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",93],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","32646"]],VERT_CS["IMAGINE GeoTIFF SupportERDAS IMAGINE 2020  16.6.0.1217Unable to match Vertical Coordinate System to a VerticalCSTypeGeoKey valueEllipsoid = WGS 84Datum = WGS 84",VERT_DATUM["unknown",2005],UNIT["metre",1.0,AUTHORITY["EPSG","9001"]],AXIS["Up",UP]]]

Geographic Coordinates (Lat, Lon, Elevation) - EPSG:4326
North-East (Lat, Lon, Elevation): (39.58590621136275, 97.71255159551268, 4245.2)
South-West (Lat, Lon, Elevation): (39.486663060327146, 97.46216971810554, 2836.808)

Projected Coordinates (X, Y) - EPSG:32646
North-East (X, Y): (904767.7174, 4392419.096)
South-West (X, Y): (883801.0954, 4380298.573)

Classifications:
Class 0 (Created, never classified)165,856,569
Class 7 (Low Point (noise))93,636
6     changma6.laz     1.82 GB     259,219,381     115,154,093     2.25         File Metadata    
SpatialReference: 
COMPD_CS["unknown",PROJCS["WGS 84 / UTM zone 46N",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",93],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","32646"]],VERT_CS["IMAGINE GeoTIFF SupportERDAS IMAGINE 2016  16.0.0.75Unable to match Vertical Coordinate System to a VerticalCSTypeGeoKey valueEllipsoid = WGS 84Datum = WGS 84",VERT_DATUM["unknown",2005],UNIT["metre",1.0,AUTHORITY["EPSG","9001"]],AXIS["Up",UP]]]

Geographic Coordinates (Lat, Lon, Elevation) - EPSG:4326
North-East (Lat, Lon, Elevation): (39.5528024565568, 97.81857408565796, 4327.714)
South-West (Lat, Lon, Elevation): (39.478960703451115, 97.6160717757046, 3012.47)

Projected Coordinates (X, Y) - EPSG:32646
North-East (X, Y): (914075.5639, 4389226.71)
South-West (X, Y): (897087.8746, 4380111.782)

Classifications:
Class 0 (Created, never classified)259,111,378
Class 7 (Low Point (noise))108,003
  Summary 7.36 GB     1,200,979,863     1,080,260,081     1.11      
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