L2

Processing Report

10 May 2022

Survey Data

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

Fig. 1. Camera locations and image overlap.

Number of images: 133 Flying altitude: 1.6 m Ground resolution: 0.487 mm/pix Coverage area: 6.53 m² Camera stations: 123 Tie points: 41,015 Projections: 87,275 Reprojection error: 0.331 pix
Camera Model Resolution Focal Length Pixel Size Precalibrated
iPhone SE, iPhone SE back camera 4.15mm f/2.2 (4.15mm) 4032 x 3024 4.15 mm 1.23 x 1.23 Îĵm No

Table 1. Cameras.

Camera Calibration

1 pix

Fig. 2. Image residuals for iPhone SE, iPhone SE back camera 4.15mm f/2.2 (4.15mm).

iPhone SE, iPhone SE back camera 4.15mm f/2.2 (4.15mm)

133 images

Type Resolution Focal Length Pixel Size Frame 4032 x 3024 4.15 mm 1.23 x 1.23 Îĵm
Value Error F Cx Cy K1 K2 K3 P1 P2
F 3413.42 0.33 1.00 0.04 0.02 0.14 0.04 -0.11 0.01 0.03
Cx -9.14493 0.24 1.00 -0.08 0.07 -0.07 0.04 0.81 -0.07
Cy 18.708 0.3 1.00 0.02 0.01 -0.04 -0.08 0.86
K1 0.118806 0.00024 1.00 -0.93 0.84 0.05 -0.00
K2 -0.175526 0.0011 1.00 -0.97 -0.05 0.01
K3 -0.0193241 0.0017 1.00 0.02 -0.04
P1 0.000270405 2.4e-05 1.00 -0.07
P2 -0.000370714 2.9e-05 1.00

Table 2. Calibration coefficients and correlation matrix.

Camera Locations

2 m -10 m -8 m -6 m -4 m -2 m 0 m 2 m 4 m 6 m 8 m 10 m x 1

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)
1.86038 1.08746 2.7855 2.1549 3.52173

Table 3. Average camera location error.

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

Digital Elevation Model

142 m 154 m 2 m

Fig. 4. Reconstructed digital elevation model.

Resolution: 0.974 mm/pix Point density: 1.06 points/mm²

Processing Parameters

General
Cameras 133
Aligned cameras 123
Coordinate system WGS 84 (EPSG::4326)
Rotation angles Yaw, Pitch, Roll
Point Cloud
Points 41,015 of 419,085
RMS reprojection error 0.154823 (0.330591 pix)
Max reprojection error 2.5409 (5.42162 pix)
Mean key point size 2.04293 pix
Point colors 3 bands, uint8
Key points No
Average tie point multiplicity 2.73245
Alignment parameters
Accuracy Highest
Generic preselection Yes
Reference preselection No
Key point limit 60,000
Tie point limit 0
Exclude stationary tie points Yes
Guided image matching No
Adaptive camera model fitting No
Matching time 10 seconds
Matching memory usage 469.72 MB
Alignment time 20 seconds
Alignment memory usage 125.08 MB
Optimization parameters
Parameters f, cx, cy, k1-k3, p1, p2
Adaptive camera model fitting No
Optimization time 3 seconds
Software version 1.7.2.12040
File size 19.63 MB
Depth Maps
Count 115
Depth maps generation parameters
Quality High
Filtering mode Mild
Processing time 2 minutes 26 seconds
Memory usage 1.47 GB
Software version 1.7.2.12040
File size 412.95 MB
Dense Point Cloud
Points 20,861,643
Point colors 3 bands, uint8
Depth maps generation parameters
Quality High
Filtering mode Mild
Processing time 2 minutes 26 seconds
Memory usage 1.47 GB
Dense cloud generation parameters
Processing time 16 minutes 55 seconds
Memory usage 6.02 GB
Software version 1.7.2.12040
File size 696.23 MB
Model
Faces 4,172,327
Vertices 2,111,958
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
Processing time 2 minutes 26 seconds
Memory usage 1.47 GB
Reconstruction parameters
Surface type Arbitrary
Source data Dense cloud
Interpolation Enabled
Strict volumetric masks No
Processing time 9 minutes 42 seconds
Memory usage 14.14 GB
Texturing parameters
Mapping mode Generic
Blending mode Mosaic
Texture size 4,096
Enable hole filling Yes
Enable ghosting filter Yes
UV mapping time 5 minutes 19 seconds
UV mapping memory usage 3.28 GB
Blending time 4 minutes 8 seconds
Blending memory usage 5.73 GB
Software version 1.7.2.12040
File size 391.32 MB
Tiled Model
Texture 3 bands, uint8
Depth maps generation parameters
Quality High
Filtering mode Mild
Processing time 2 minutes 26 seconds
Memory usage 1.47 GB
Reconstruction parameters
Source data Dense cloud
Tile size 256
Face count High
Enable ghosting filter No
Processing time 52 minutes 53 seconds
Memory usage 4.42 GB
Software version 1.7.2.12040
File size 638.96 MB
System
Software name Agisoft Metashape Professional
Software version 1.7.2 build 12040
OS Windows 64 bit
RAM 127.78 GB
CPU Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz
GPU(s) GeForce RTX 2080