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Aerophotogrammetry Survey Report

1) An aerophotogrammetric survey was conducted over an area of 0.146 km2, capturing 188 images from 188 camera stations at an altitude of 96.2 m. 2) Camera calibration was performed on the Test_Pro camera, determining intrinsic and distortion parameters. 3) Camera locations were determined with an average horizontal/vertical error of 2.9/1.4 m and average altitude error of 53.8 m. 4) 12 ground control points and 11 check points were used, with the control points achieving sub-centimeter horizontal and vertical accuracy.

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Lucas Magno
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41 views9 pages

Aerophotogrammetry Survey Report

1) An aerophotogrammetric survey was conducted over an area of 0.146 km2, capturing 188 images from 188 camera stations at an altitude of 96.2 m. 2) Camera calibration was performed on the Test_Pro camera, determining intrinsic and distortion parameters. 3) Camera locations were determined with an average horizontal/vertical error of 2.9/1.4 m and average altitude error of 53.8 m. 4) 12 ground control points and 11 check points were used, with the control points achieving sub-centimeter horizontal and vertical accuracy.

Uploaded by

Lucas Magno
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Relatório levantamento aerofotogramétrico

RELATÓRIO SM_Rev_01

Responsável Técnico: LUCAS MAGNO TEÓFILO LINS


CFT: 5144882/2023
20 March 2024
Survey Data

>9
9
8
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5
4
3
2
1

100 m

Fig. 1. Camera locations and image overlap.

Number of images: 188 Camera stations: 188

Flying altitude: 96.2 m Tie points: 588,719

Ground resolution: 2.66 cm/pix Projections: 2,098,288

Coverage area: 0.146 km² Reprojection error: 0.598 pix

Camera Model Resolution Focal Length Pixel Size Precalibrated

Test_Pro (8.38mm) 5472 x 3648 8.38 mm 2.51 x 2.51 μm No

Table 1. Cameras.

Page 2
Camera Calibration

1 pix
Fig. 2. Image residuals for Test_Pro (8.38mm).

Test_Pro (8.38mm)

188 images, rolling shutter

Type Resolution Focal Length Pixel Size

Frame 5472 x 3648 8.38 mm 2.51 x 2.51 μm

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

F 3453.24 0.36 1.00 0.85 -0.03 0.01 -0.00 0.05 -0.54 0.76 -0.83 0.07 0.00

Cx 21.439 0.028 1.00 -0.04 0.01 0.01 0.06 -0.49 0.67 -0.72 0.38 -0.01

Cy 27.3378 0.012 1.00 0.01 -0.01 0.00 0.02 -0.03 0.03 -0.02 0.49

B1 1.72592 0.014 1.00 0.02 0.02 -0.03 0.04 -0.04 -0.02 0.01

B2 -0.538403 0.013 1.00 0.00 0.00 -0.00 0.00 0.01 -0.00

K1 -0.0122026 3.6e-05 1.00 -0.84 0.63 -0.53 0.04 0.00

K2 -0.244761 0.0002 1.00 -0.95 0.90 -0.05 -0.00

K3 0.553316 0.00047 1.00 -0.99 0.06 0.00

K4 -0.323863 0.00034 1.00 -0.06 -0.00

P1 0.000920596 1.1e-06 1.00 -0.01

P2 3.13183e-05 7.8e-07 1.00

Table 2. Calibration coefficients and correlation matrix.

Page 3
Camera Locations

60 m
48 m
36 m
24 m
12 m
0m
-12 m
-24 m
-36 m
-48 m
-60 m

x3

100 m

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)

2.94435 1.40892 53.8259 3.26409 53.9248

Table 3. Average camera location error.


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

Page 4
Ground Control Points

11 cm
8.8 cm
6.6 cm
4.4 cm
V B08 2.2 cm
V B09
0 cm
V B06 V B07
V B03 V B04 V B05
-2.2 cm
V B20
-4.4 cm

V B25 -6.6 cm
V B24
-8.8 cm
V B22 V B21
-11 cm

V B26
V B23
x 300
V B40
V B41
V B27
V B38 V B39

V B37

V B33

V B36

V B34

C ontrol points C heck points


100 m

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)

12 1.12507 1.02219 0.793976 1.52009 1.71495

Table 4. Control points RMSE.


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

Count X error (cm) Y error (cm) Z error (cm) XY error (cm) Total (cm)
11 2.46085 3.19542 5.59886 4.03318 6.90027

Table 5. Check points RMSE.


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

Page 5
Label X error (cm) Y error (cm) Z error (cm) Total (cm) Image (pix)
VB05 -0.695318 0.27869 -0.371317 0.836069 0.506 (16)

VB09 0.184793 0.350421 -0.595614 0.715332 0.573 (17)

VB21 -0.502906 -1.74779 1.60602 2.42631 0.738 (23)


VB23 -1.0516 -1.67469 1.1085 2.26699 0.703 (26)

VB24 -0.167135 0.224296 -0.815177 0.861833 0.588 (29)

VB26 -1.01121 -0.276542 0.398515 1.12154 0.517 (18)


VB27 3.05553 1.38639 0.638196 3.4155 0.753 (19)
VB33 -0.741149 -0.370746 -0.862635 1.1962 0.617 (18)

VB34 -0.268913 -0.147758 0.239415 0.389186 0.583 (15)


VB36 -0.695097 0.226009 -0.35725 0.813552 0.560 (18)
VB38 1.03671 -0.284426 -0.212329 1.09578 0.608 (25)

VB40 0.864122 2.03435 -1.02922 2.43815 0.639 (22)


Total 1.12507 1.02219 0.793976 1.71495 0.626

Table 6. Control points.


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

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

VB03 1.11347 2.85108 -5.11699 5.96256 0.614 (12)


VB04 2.13393 1.52949 -3.18256 4.12573 0.445 (16)
VB06 1.97658 -0.568425 -1.92174 2.81479 0.476 (18)

VB07 -0.719827 1.14703 -8.80926 8.91274 0.561 (21)


VB08 0.417703 -4.76669 -2.98936 5.642 0.526 (19)
VB20 2.76824 -3.58706 10.518 11.4524 0.413 (15)

VB22 -0.110035 -3.76009 0.759334 3.83758 0.484 (24)


VB25 0.108038 2.66026 -3.0737 4.06648 0.504 (15)
VB37 -4.0725 -3.7458 8.10575 9.81425 0.477 (21)

VB39 -5.61891 -5.24081 4.86037 9.09184 0.604 (15)


VB41 0.61342 -1.38219 2.88052 3.25333 0.530 (24)
Total 2.46085 3.19542 5.59886 6.90027 0.513

Table 7. Check points.


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

Page 6
Digital Elevation Model
915 m

865 m

100 m

Fig. 5. Reconstructed digital elevation model.

Resolution: 5.32 cm/pix

Point density: 354 points/m²

Page 7
Processing Parameters

General
Cameras 188
Aligned cameras 188
Markers 31
Shapes
Polygon 1
Coordinate system SIRGAS 2000 / UTM zone 23S (EPSG::31983)
Rotation angles Yaw, Pitch, Roll
Tie Points
Points 588,719 of 977,685
RMS reprojection error 0.206501 (0.59834 pix)
Max reprojection error 1.99564 (7.46463 pix)
Mean key point size 2.89616 pix
Point colors 3 bands, uint8
Key points No
Average tie point multiplicity 4.03398
Alignment parameters
Accuracy High
Generic preselection Yes
Reference preselection No
Key point limit 200,000
Key point limit per Mpx 1,000
Tie point limit 20,000
Exclude stationary tie points Yes
Guided image matching No
Adaptive camera model fitting Yes
Matching time 7 minutes 37 seconds
Matching memory usage 1.40 GB
Alignment time 10 minutes 42 seconds
Alignment memory usage 1.97 GB
Optimization parameters
Parameters f, b1, b2, cx, cy, k1-k4, p1, p2
Adaptive camera model fitting Yes
Optimization time 6 seconds
Date created 2024:02:04 21:22:35
Software version 2.0.1.15925
File size 76.48 MB
Point Cloud
Points 95,343,618
Point attributes
Position
Color 3 bands, uint8
Normal
Confidence
Point classes
Created (never classified) 95,343,618
Depth maps generation parameters
Quality High
Filtering mode Aggressive
Max neighbors 16
Processing time 12 minutes 22 seconds
Memory usage 4.45 GB
Point cloud generation parameters
Processing time 19 minutes 54 seconds

Page 8
Memory usage 10.21 GB
Date created 2024:02:04 23:10:42
Software version 2.0.1.15925
File size 1.35 GB
DEM
Size 9,668 x 9,357
Coordinate system SIRGAS 2000 / UTM zone 23S (EPSG::31983)
Reconstruction parameters
Source data Point cloud
Interpolation Enabled
Processing time 46 seconds
Memory usage 309.78 MB
Date created 2024:02:04 23:12:59
Software version 2.0.1.15925
File size 238.86 MB
Orthomosaic
Size 19,335 x 18,713
Coordinate system SIRGAS 2000 / UTM zone 23S (EPSG::31983)
Colors 3 bands, uint8
Reconstruction parameters
Blending mode Mosaic
Surface DEM
Enable hole filling Yes
Enable ghosting filter Yes
Processing time 21 minutes 44 seconds
Memory usage 12.65 GB
Date created 2024:02:04 23:28:18
Software version 2.0.1.15925
File size 4.02 GB
System
Software name Agisoft Metashape Professional
Software version 2.0.1 build 15925
OS Windows 64 bit
RAM 31.84 GB
CPU 13th Gen Intel(R) Core(TM) i7-13700F
GPU(s) NVIDIA GeForce RTX 3060

Page 9

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