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April 24, 2003
Job number: 03036fdi
AT Report for CANFOR – PRINCE GEORGE: 93F,G,J,K
Photography: Colour 1:30000 scale flown August 2002 by Hauts-Monts with 2 cameras: Wild
RC20 s/n 5155 fl 153.253mm, Zeiss TOP15 s/n 149989, fl 152.684mm.
Control: Full Airborne GPS for 1:30000 photo, points transferred from TRIM II AT blocks:
Bowron 1997, and Fraser Lake 1997.
Scanning: Done by Triathlon utilizing Z/I PhotoScan TD scanner, 14 micron pixel, JPEG .tjp
format.
Mensuration: Point selection, coding & measuring done with Z/I Imaging ISAT and ISDM
software.
Block Adjustment: PATB-NT revision Nov-00, analysis with GRAVIEWB. Features used: Self
Calibration with maximum 12 parameters and Airborne Drift Correction
stripwise.
Procedure: Total 1353 photos were bridged in this block. ISAT software was used to
generate passpoints and tiepoints by means of automatic image correlation. All
points generated by ISAT have 8-digit point numbers. Editing was then carried
out using ISDM semi-automatic (operator controlled) method. Additional
manually measured points have TRIM2 point numbers with 6 or 7 digits.
Additional tiepoints were added to the outside halves of the first and last photo in
each strip to strengthen the block perimeter.
Results: Sigma Naught is 4.97 microns or 0.156 meter. Full statistics are included in the
"printout" files supplied. The results indicate the relative accuracy is better than
0.5 metre. I believe the absolute accuracy is in the order of +/- 3 metres in
horizontal and vertical.
INPUT AT FILES DELIVERED
canfor_11.con Input control file for PATB-NT. Contains horizontal, vertical, and airborne GPS
control.
canfor_11.im Original plate coordinates for input to PATB-NT. Coordinates are refined to the
fiducial system by normal 6 parameter transformation & lens distortion correction,
but NOT corrected for earth curvature, refraction or self calibration.
13800 Commerce Parkway, Richmond, BC V6V 2J3 – Tel: (604) 233-5000 - Fax: (604) 233-5005 – www.triathloninc.com
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OUTPUT AT FILES DELIVERED
canfor_11_sort.pri Full printout file from PATB-NT adjustment with Self Calibration. Includes
statistics, corrected plate coordinates with residuals in microns, control summary
with residuals in meters, critical points and adjusted coordinates in ascending
order.
canfor_12_inv_sort.pri Printout file from PATB-NT using Inversion of Normal Equations. Includes
additional statistics for posteriori standard deviations, control summary, and
adjusted coordinates with standard deviations for each point.
canfor_12_inv_sort.ori Exterior orientations with standard deviations. PATB rotational matrix is based on:
omega primary, phi secondary, kappa tertiary.
canfor_11_sort.cor Output plate coordinates. Coordinates are corrected for self calibration, earth
curvature and refraction. At end of file are Horizontal & Vertical control as well as
corrected Airborne GPS control.
pcs_11_sort.txt Perspective centers (pt# xyz), extracted from exterior orientations.
canfor_11_sort.adj Adjusted terrain coordinates and residuals, sorted by photo.
Hardcopy outputs provided are:
This written A/T report.
Printout of block adjustment summaries including statistics (run#11 self-calibration and run#12
inversion), and control summary with airborne GPS.
GRAVIEWB plots: Horizontal Control Vectors, and Error Ellipses.
A/T index plot @ 1:250,000 scale, with photography roll and frame numbers shown prominently in
red.
If any questions arise, contact George Jarrouj who carried out all A/T work, or Dave Dixon who carried out
final block adjustment and QA.
Dave Dixon, TRIATHLON Email: dixon@triathloninc.com
13800 Commerce Parkway Phone, reception: (604)233-5000
Richmond, BC Phone, direct: (604)233-5008
Canada V6V 2J3 Fax: (604)233-5005
Web: www.triathloninc.com
13800 Commerce Parkway, Richmond, BC V6V 2J3 – Tel: (604) 233-5000 - Fax: (604) 233-5005 – www.triathloninc.com
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03036FDI CANFOR – Prince George April 16, 2003
Full Block PATB Run 11 Horizontal Control Residual Vectors exaggerated 2000X
13800 Commerce Parkway, Richmond, BC V6V 2J3 – Tel: (604) 233-5000 - Fax: (604) 233-5005 – www.triathloninc.com
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03036FDI CANFOR – Prince George Full Block PATB Run 12 April 16, 2003
Posteriori Standard Deviations from Inversion of Normal Equations
Error Ellipses shown for adjusted terrain points > 0.5 metre, exaggerated 2000X
13800 Commerce Parkway, Richmond, BC V6V 2J3 – Tel: (604) 233-5000 - Fax: (604) 233-5005 – www.triathloninc.com