Agisoft PhotoScanProcessing Report

04 August 2017

Survey Data

50 m

1

2

3

4

5

6

7

8

9

> 9

Fig. 1. Camera locations and image overlap.

Number of images: 1,769

Flying altitude: 20.3 m

Ground resolution: 7.78 mm/pix

Coverage area: 0.0823 km²

Camera stations: 1,769

Tie points: 571,591

Projections: 2,931,420

Reprojection error: 1.76 pix

Camera Model Resolution Focal Length Pixel Size Precalibrated

FC300X (3.61 mm) 4000 x 3000 3.61 mm 1.56 x 1.56 μm No

Table 1. Cameras.

Camera Calibration

1 pix

Fig. 2. Image residuals for FC300X (3.61 mm).

FC300X (3.61 mm)

1769 images

Type Resolution Focal Length Pixel SizeFrame 4000 x 3000 3.61 mm 1.56 x 1.56 μm

Value Error F Cx Cy B1 B2 K1 K2 K3 K4 P1 P2

F 2263.65 0.44 1.00 -0.72 -0.94 -0.04 -0.12 -0.01 -0.14 0.29 -0.36 -0.05 0.05

Cx 3.0735 0.035 1.00 0.68 0.04 0.14 -0.01 0.12 -0.22 0.27 0.29 -0.04

Cy 41.0749 0.064 1.00 0.00 0.12 -0.01 0.15 -0.29 0.35 0.05 0.05

B1 -10.6814 0.011 1.00 0.01 0.01 -0.01 0.01 -0.00 0.00 -0.02

B2 0.767534 0.012 1.00 -0.00 0.02 -0.04 0.05 0.01 -0.01

K1 0.00160911 4.8e-05 1.00 -0.96 0.89 -0.82 -0.01 -0.01

K2 -0.0345384 0.00016 1.00 -0.98 0.94 0.01 -0.00

K3 0.0590483 0.00022 1.00 -0.99 -0.02 0.01

K4 -0.024278 0.0001 1.00 0.02 -0.01

P1 -0.000152054 1.7e-06 1.00 0.01

P2 0.000643677 1.3e-06 1.00

Table 2. Calibration coefficients and correlation matrix.

Camera Locations

50 m

-90 m

-72 m

-54 m

-36 m

-18 m

0 m

18 m

36 m

54 m

72 m

90 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)

140.555 896.591 74.8647 907.541 910.623

Table 3. Average camera location error.

X - Easting, Y - Northing, Z - Altitude.

Ground Control Points

50 m

D1

D2

D3

D4

D5D6

D7

D8

D9

Control points Check points

-2.5 cm

-2 cm

-1.5 cm

-1 cm

-0.5 cm

0 cm

0.5 cm

1 cm

1.5 cm

2 cm

2.5 cm

x 300

Fig. 4. GCP locations and error estimates.

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

Estimated GCP locations are marked with a dot or crossing.

Count X error (cm) Y error (cm) Z error (cm) XY error (cm) Total (cm)

9 1.23773 1.91448 1.57255 2.27974 2.7695

Table 4. Control points RMSE.

X - Easting, Y - Northing, Z - Altitude.

Label X error (cm) Y error (cm) Z error (cm) Total (cm) Image (pix)

D1 -0.124677 -3.70271 2.1619 4.28946 0.132 (12)

D2 1.96643 -1.93454 0.378182 2.78429 0.252 (12)

D3 1.80673 0.897913 -1.21429 2.35479 0.240 (16)

D4 0.653703 1.45573 -0.526376 1.68035 0.144 (18)

D5 -0.46697 1.18036 2.08291 2.43923 0.155 (15)

D6 -0.623182 0.929906 1.31372 1.72596 0.139 (22)

D7 -2.24129 0.497824 -2.29844 3.2487 0.184 (13)

D8 -0.72274 -1.88642 0.174984 2.0277 0.089 (12)

D9 -0.248113 2.55827 -2.07606 3.30399 0.166 (13)

Total 1.23773 1.91448 1.57255 2.7695 0.172

Table 5. Control points.

X - Easting, Y - Northing, Z - Altitude.

Digital Elevation Model

50 m

1.36 km

1.37 km

Fig. 5. Reconstructed digital elevation model.

Resolution: 3.11 cm/pix

Point density: 10.3 points/cm²

Processing Parameters

General

Cameras 1769

Aligned cameras 1769

Markers 9

Coordinate system NAD83(HARN) / Nevada West (ftUS) (EPSG::3431)

Rotation angles Yaw, Pitch, Roll

Point Cloud

Points 571,591 of 697,926

RMS reprojection error 0.212355 (1.7635 pix)

Max reprojection error 1.37912 (42.1543 pix)

Mean key point size 7.49583 pix

Effective overlap 5.47786

Alignment parameters

Accuracy Medium

Generic preselection Yes

Reference preselection Yes

Key point limit 20,000

Tie point limit 2,000

Constrain features by mask No

Adaptive camera model fitt ing Yes

Matching time 1 hours 3 minutes

Alignment time 44 minutes 47 seconds

Optimization parameters

Parameters f, b1, b2, cx, cy, k1-k4, p1, p2

Fit rolling shutter No

Optimization time 4 minutes 50 seconds

Dense Point Cloud

Points 107,217,455

Reconstruction parameters

Quality Medium

Depth filtering Aggressive

Depth maps generation time 5 hours 8 minutes

Dense cloud generation time 59 minutes 31 seconds

DEM

Size 16,053 x 15,077

Coordinate system NAD83(HARN) / Nevada West (ftUS) (EPSG::3431)

Reconstruction parameters

Source data Dense cloud

Interpolation Enabled

Processing time 5 minutes 56 seconds

Software

Version 1.3.2 build 4205

Platform Windows 64