Meyerfjellet

Filtering: Dense cloud: 4-255 Connected mesh: 99%

19 February 2022

Survey Data

1 2 3 4 5 6 7 8 9 > 9 500 m

Fig. 1. Camera locations and image overlap.

Number of images: 222 Flying altitude: 793 m Ground resolution: 11 cm/pix Coverage area: 1.4 km² Camera stations: 222 Tie points: 91,703 Projections: 646,023 Reprojection error: 0.48 pix
Camera Model Resolution Focal Length Pixel Size Precalibrated
L1D-20c (10.26mm) 5472 x 3648 10.26 mm 2.41 x 2.41 μm No

Table 1. Cameras.

Camera Calibration

1 pix

Fig. 2. Image residuals for L1D-20c (10.26mm).

L1D-20c (10.26mm)

222 images

Type Resolution Focal Length Pixel Size Frame 5472 x 3648 10.26 mm 2.41 x 2.41 μm
Value Error F Cx Cy B1 B2 K1 K2 K3 P1 P2
F 4309.26 0.18 1.00 0.02 0.63 -0.95 -0.28 0.01 0.06 -0.07 0.10 -0.00
Cx 25.322 0.11 1.00 -0.07 0.01 0.25 0.03 -0.02 0.04 0.90 -0.08
Cy -63.0586 0.14 1.00 -0.75 -0.22 -0.12 0.08 -0.08 -0.01 0.65
B1 25.1079 0.19 1.00 0.25 0.07 -0.05 0.06 -0.05 -0.11
B2 18.7051 0.11 1.00 0.00 -0.02 0.03 -0.15 -0.06
K1 1.08572e-05 2.8e-05 1.00 -0.91 0.83 0.05 -0.20
K2 0.0171566 0.00011 1.00 -0.98 -0.01 0.10
K3 -0.0252956 0.00013 1.00 0.02 -0.09
P1 0.00138907 7.6e-06 1.00 -0.08
P2 -0.00281732 4.9e-06 1.00

Table 2. Calibration coefficients and correlation matrix.

Camera Locations

500 m -1.1 m -0.88 m -0.66 m -0.44 m -0.22 m 0 m 0.22 m 0.44 m 0.66 m 0.88 m 1.1 m x 40

Fig. 3. Camera locations and error estimates.

Z error is represented by ellipse color. X,Y errors are represented by ellipse shape.

Estimated camera locations are marked with a black dot.

X error (m) Y error (m) Z error (m) XY error (m) Total error (m)
1.07296 1.631 0.424633 1.95229 1.99793

Table 3. Average camera location error.

X - Longitude, Y - Latitude, Z - Altitude.

Digital Elevation Model

230 m 800 m 500 m

Fig. 4. Reconstructed digital elevation model.

Resolution: 22 cm/pix Point density: 20.7 points/m²

Processing Parameters

General
Cameras 222
Aligned cameras 222
Shapes
LineString 10
Coordinate system WGS 84 (EPSG::4326)
Rotation angles Yaw, Pitch, Roll
Point Cloud
Points 91,703 of 122,387
RMS reprojection error 0.214784 (0.479626 pix)
Max reprojection error 1.05213 (24.3428 pix)
Mean key point size 2.02797 pix
Point colors 3 bands, uint8
Key points No
Average tie point multiplicity 7.58288
Alignment parameters
Accuracy Highest
Generic preselection Yes
Reference preselection Source
Key point limit 40,000
Tie point limit 4,000
Exclude stationary tie points Yes
Guided image matching No
Adaptive camera model fitting Yes
Matching time 2 minutes 11 seconds
Matching memory usage 299.00 MB
Alignment time 2 minutes 23 seconds
Alignment memory usage 204.94 MB
Optimization parameters
Parameters f, cx, cy, k1-k3, p1, p2
Adaptive camera model fitting Yes
Optimization time 5 seconds
Software version 1.7.1.11797
File size 16.64 MB
Depth Maps
Count 222
Depth maps generation parameters
Quality High
Filtering mode Mild
Max neighbors 100
Processing time 16 minutes 27 seconds
Memory usage 8.10 GB
Software version 1.7.1.11797
File size 858.48 MB
Dense Point Cloud
Points 25,993,122
Point colors 3 bands, uint8
Depth maps generation parameters
Quality High
Filtering mode Mild
Max neighbors 100
Processing time 16 minutes 27 seconds
Memory usage 8.10 GB
Dense cloud generation parameters
Processing time 30 minutes 57 seconds
Memory usage 10.33 GB
Software version 1.7.1.11797
File size 792.14 MB
Model
Faces 5,030,456
Vertices 2,534,346
Vertex colors 3 bands, uint8
Texture 4,096 x 4,096 x 10, 4 bands, uint8
Depth maps generation parameters
Quality High
Filtering mode Mild
Max neighbors 100
Processing time 16 minutes 27 seconds
Memory usage 8.10 GB
Reconstruction parameters
Surface type Arbitrary
Source data Dense cloud
Interpolation Enabled
Strict volumetric masks No
Processing time 10 minutes 17 seconds
Memory usage 14.74 GB
Texturing parameters
Mapping mode Generic
Blending mode Mosaic
Texture size 4,096
Enable hole filling Yes
Enable ghosting filter Yes
UV mapping time 3 minutes 39 seconds
UV mapping memory usage 3.96 GB
Blending time 1 minutes 53 seconds
Blending memory usage 5.67 GB
Software version 1.7.1.11797
File size 411.72 MB
Tiled Model
Texture 3 bands, uint8
Depth maps generation parameters
Quality High
Filtering mode Mild
Max neighbors 100
Processing time 16 minutes 27 seconds
Memory usage 8.10 GB
Reconstruction parameters
Source data Dense cloud
Tile size 128
Face count Low
Enable ghosting filter No
Processing time 13 hours 12 minutes
Memory usage 15.32 GB
Software version 1.7.1.11797
File size 11.50 GB
System
Software name Agisoft Metashape Professional
Software version 1.7.2 build 12040
OS Windows 64 bit
RAM 127.71 GB
CPU Intel(R) Xeon(R) Gold 5122 CPU @ 3.60GHz
GPU(s) Quadro P5000