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ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA ACCURACY OF PHOTOMOD AERIAL TRIANGULATION Ivan KATZARSKY, Vanya PETROVA GIS SOFIA.

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Presentation on theme: "ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA ACCURACY OF PHOTOMOD AERIAL TRIANGULATION Ivan KATZARSKY, Vanya PETROVA GIS SOFIA."— Presentation transcript:

1 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA ACCURACY OF PHOTOMOD AERIAL TRIANGULATION Ivan KATZARSKY, Vanya PETROVA GIS SOFIA Ltd., Bulgaria

2 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA For evaluation the capacity of a digital photogrammetric system of special importance is the accuracy of the aerial triangulation An experiment in 4 variants in Photogrammetry Department at GIS SOFIA Ltd. determines the accuracy of PHOTOMOD INTRODUCTION

3 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA SOFIA MUNICIPALITY Test area TEST AREA Contractor: Hansa Luftbild Sensorik und Photogrammetry GmbH, Münster Execution of the photo-flight: Aircraft: Cessna 404 Titan Aerial camera: Zeiss RMK TOP 30/23 (Z/I Imaging) Overlap between the pictures: forward 60 %, side 30 % Aerial film: Kodak Aerocolor Negative 2444 III, 19 DIN Film processor: Colenta Area: 3103 hectares Terrain: flat, lightly hilly and hilly not dense urban area with predominantly low houses Average height of the terrain above sea level: 750 m Test area characteristics Aerial photography

4 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA DELTASCAN GeoSystem Scientific Production Enterprise 12 μm pixel size Scanning Pre-marked on the terrain ground control and check points, determined by GPS-receiver Topcon GGD with an accuracy of ± 2 cm in position and ± 3 cm in height Land surveying

5 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA General information EXPERIMENT DESCRIPTION Blocks of aerial pictures……………………………………………….. 1 Strips of aerial pictures………………………………………………… 6 Aerial pictures…………………………… = 105 Approximate picture scale…………………………………….. 1 : 4710 Average flight height above the terrain, m……………………… 1440 Ground pixel size, cm………………………………………………. 5.7 Pre-marked points on the terrain……………………………………. 36 Pictures per 1 pre-marked point……………………………………… 3 Tie points…………………………………………………………….. 786

6 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA Scheme of the experimental block

7 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA Experimented variants PHOTOMOD Montage Desktop PHOTOMOD AT PHOTOMOD Solver Aerial triangulation by PHOTOMOD 4.2 modules Polynomial correction of 2nd degree in X, Y and Z axes are applied

8 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA The accuracy of aerial triangulation is evaluated by mean square differences between geodetic and photogrammetric coordinates of the ground control and check points RESULTS Accuracy on the terrain, based on ground control points

9 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA Accuracy on the terrain, based on check points

10 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA ANALYSIS The mean square differences between geodetic and photogrammetric In X-axis :± 3.2 cm to ± 3.8 cm In Y-axis : ± 1.1 cm to ± 3.7 cm In XY-plane : ± 4.0 cm to ± 5.0 cm In Z-axis :± 2.3 cm to ± 7.1 cm co-ordinates of the ground control points are in the following range The mean square differences between geodetic and photogrammetric co-ordinates of the check points are in the following range In X-axis :± 4.5 cm to ± 7.3 cm In Y-axis:± 4.3 cm to ± 9.3 cm In XY-plane:± 6.3 cm to ± 11.8 cm In Z-axis:± 8.0 cm to ± 26.7 cm

11 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA CONCLUSIONS PHOTOMOD aerial triangulation, based on one ground control point per 4 to 7 pictures, shows best result The results strongly depend on the experimental conditions and parameters. It gives an idea only for the capacity of PHOTOMOD aerial triangulation. Another experiment could show other results Aerial triangulation carried out by PHOTOMOD shows a reliable accuracy

12 ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA THANK YOU FOR YOUR ATTENTION! Assoc. Prof. Dr. Ivan Katzarsky 22 Omourtag Street BG-1124 Sofia, Bulgaria Tel.: +359 (0) GSM: +359 (0) Vanya Petrova, M.Sc. GIS SOFIA Ltd., Photogrammetry Dept. 5 Serdica Str., BG-1000 Sofia, Bulgaria Tel.: +359 (0) ; GSM: +359 (0) Authors


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