Photogrammetric trials in Hyytiälä July 4-10; 2013

A DVD has all the image and iWitness data. 

1. The 3D rig was calibrated using 8 points with known coordinates (estimates of course) 8 images with 16 mm lens were used.
Calibration was c = 15.7020, xp = 0.0697; yp = -0.0913; k1=1.4756e-003; k2=2.9261e-006; k3=7.0301e-009; p1=-3.1371e-006; 1.9597e-005; B1 = 0; B2 = 0;
See folder \RigCalibration\
- 3D points on the RIG, list of 3D coords, 
- Points seen in image A & B. 

2. Sites were arbitararily chosen in a seedling stand (the 2010 burned SMEAR stand)

Camera parameters for the 18-mm lens used in the field
c =   18.700840 mm; xp =   -0.007595 mm; yp =   -0.014588 mm; K1 = 4.8126e-004; K2 = -4.9598e-007; 
K3 = -1.9333e-009; P1 = 3.5248e-005; P2 = -3.4395e-006; B1 = -8.6844e-004; B2 = -9.4905e-005

Solved HDR-files Hdr_teko_Heina_2003.csv. [Scale is in meters]. With iWitness.

The following sites were photographed:

Site/Project (all F8 and manual exposure); trials in the field

Vattu5;
Shaded;
DSC_4026..DSC_4035 (10);
RMSE 0.66 pixels;
RMSE_3D 0.42 cm;
2 x 5 images with elevation angles 60 and 40 degrees.

Vattu6;
Overcast;
DSC_4055..DSC__4063, DSC_4071..DSC_4082 (21);
RMSE 0.66 pixels;
RMSE_3D 0.136 cm,
15 images near nadir in two lines, 6 images at low elevation

Vattu7;
Overcast;
DSC_4083..DSC_4086 (4);
RMSE 0.83 pixels;
RMSE 3D 0.225 cm;
Same site as Vattu 6 but 90 degrees of in azimuth

Vattu8;
Overcast;
DSC_4094..DSC_4100 (7);
RMSE 0.96 pixels;
RMSE 3D 0.176 cm;
Seven oblique images

Vattu9;
Overcast;
DSC_4101..DSC_4107 (7);
RMSE 0.67 pixels;
RMSE 3D 0.148 cm;
Camera rotated, same as Vattu8 but in 90 degree azimuth difference

Vattu10;
Overcast;
DSC_4014..DSC_4120 (7);
RMSE 1.12 pixels;
RMSE 3D 0.136 cm;
Same site as Vattu8 but more off in Y-direction.

Koivu1;
Sunny/hazy;
DSC_4127...DSC_4134 (8);
RMSE 1.3;
RMSE 3D 0.267 cm;
Silver birch, 45 degree elevation

Koivu2;
Sunny/hazy;
DSC_4135...DSC_4142 (8);
RMSE 0.7 pixels;
RMSE 3D 0.155 cm;
Same as Koivu1/2; low elevation/side view, use a low Z-range in matching!

Koivu3a;
Late evening sun;
DSC_4171...DSC_4175 (5);
RMSE 0.97 pixels;
RMSE 3D 0.29 cm;
Oblique convergent; same birch as in Koivu1 and Koivu2 but opposite side.

Koivu3b;
Late evening sun;
DSC_4176...DSC_4179 (4);
RMSE 1.80 pixels;
RMSE 3D 0.31 cm;
Convergent oblique - example of wind ; image matching fails likely

Koivu4;
Late evening sun;
DSC_4180...DSC_4185 (6):
RMSE 0.97 pixels;
RMSE 3D 0.21 cm;
Same as Koivu3a and 3b, side view

Koivu5;
Diffuse;
DSC_4201...DSC_4204 (4):
RMSE 1.42 pixels;
RMSE 3D 0.11 cm;
Same as Koivu3a; 4204 probably off (motion)

Pihlaja1;
Sunny/hazy;
DSC_4154...DSC_4164 (11);
RMSE 0.89 pixels;
RMSE 3D 0.244 cm;
Same as Koivu1/2 (off to negative X); Oblique view at low vegetation

Pihlaja2;
Sunny/haxe;
DSC_4143...DSC_4149 (9);
RMSE 0.66 pixels; 
RMSE 3D 0.265 cm;
Same as Pihlaja1 but an oblique view at about 1 m AGL.

Calibration, July 10 after the campaign (not used)
c = 18.6054; xp = -0.0118; yp = 0.0648; k1 = 4.8170e-004; k2 = -4.0791e-007; k3 = -1.9859e-009; P1 = 2.9531e-005; P2 = 6.6110e-006;

c.f. July 5
c = 18.7008;xp = -0.007595 yp = -0.014588; K1 = 4.8126e-004; K2 = -4.9598e-007; K3 = -1.9333e-009; P1 = 3.5248e-005; P2 = -3.4395e-006; B1 = -8.6844e-004; B2 = -9.4905e-005