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Www.agpmeridian.com A comparison of the performance of various digital aerial photography systems in an aerial surveys of large territories Sergey Kadnichanskiy.

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Presentation on theme: "Www.agpmeridian.com A comparison of the performance of various digital aerial photography systems in an aerial surveys of large territories Sergey Kadnichanskiy."— Presentation transcript:

1 www.agpmeridian.com A comparison of the performance of various digital aerial photography systems in an aerial surveys of large territories Sergey Kadnichanskiy Chief Technologist

2 www.agpmeridian.com Survey of large territories, counted in the thousands, tens and hundreds of thousands of square km, is usually carried out for the creation or updating of maps of scale 1:2000 -1:25000 depending on the nature of the territory

3 www.agpmeridian.com Under performance of aerial survey system is understood as the area of the territory, aerial photography of which is performed in a unit of time. It is expedient to relate this area to one hour of flight time

4 www.agpmeridian.com Performance can be considered only in relation to certain conditions: the type and characteristics of the aircraft specific requirements to aerial photography - the scale of the map (plan) - the appointment of the aerial survey and the specific constraints to effective angle of the field of view of aerial camera

5 www.agpmeridian.com The scale of the map sets the required spatial resolution of aerial photo defined, as a rule, as the ground pixel size Map scale Range of recommended ground pixel size (cm) Average ground pixel size (cm) 1:200014-2218 1:500030-4035 1:1000040-6050 1:2500070-9080

6 www.agpmeridian.com Under the effective angle of the field of view will understand, angle, limiting the part of aerial photo image in the cross on the line of flight direction, which will be directly used in the end product, for example orthophoto

7 www.agpmeridian.com The effective angle β of the field of view is associated with the distance between the flight lines By and the height of flight H fligft line footprint β H By

8 www.agpmeridian.com Nature of the territoryβfMap scales Urban areas 30° 30 сm 1:2000, 1:5000 Open territory53°15 сm 1:10000, 1:25000 Analog aerial survey with camera 23 x 23 cm Side overlap 30% ; f=15 cm; f=30 cm

9 www.agpmeridian.com The effective image size is the number of pixels corresponding to the effective field of view β fligft line footprint β H By Effective Image Size

10 www.agpmeridian.com Research and production aerial survey and geodetic company "Meridian+" owns and uses in its work aerial survey systems of fundamentally different type, which can be effectively used for surveying large areas

11 www.agpmeridian.com Frame digital mapping aerial cameras DMC (Z/I Imaging) Size of final image pan-sharpened RGB or CIR image along track7680 pix cross track13824 pix Field of viewalong track42.0° cross track69.3° Focal length of final image120 mm Pixel size12 μм Multispectral camerasRed; Green; Blue; NIR Size of multispectral images3000 х 2000 pix Maximum frame rate2 sec/image Radiometric resolution12 bit

12 www.agpmeridian.com Aerial survey system with CCD linear arrays ADS40 (Leica Geosystems) Field of view along track 64° Focal length62.8 mm Recording interval per line1.2 ms Pixel size6.5 μm Size of CCD array12000 pix Radiometric resolution 12 bit

13 www.agpmeridian.com Scanning aerial survey system with CCD matrixes А3 (VisionMap) Focal length 300 mm Pixel size9 μm9 μm Field of view of CCD camera along track cross track 6.58° 4.58° Max of camera rotation angle104° Capacity memory (frames)250 000 Size of frame image7812*2666 pix Size of final RGB image along track cross track ~8000 pix ~60000 pix Max field of view of final image along track cross track 13.47° 108° Radiometric resolution of original image12 bit

14 www.agpmeridian.com The productivity aerial survey systems is largely supported by the use of a specially equipped for aerial photography aircraft King Air 350, (Beechcraft) Max flight altitude for aerial survey 9500 m Max speed578 km/hr Average speed439 km/hr Min speed250 km/hr Flight time5.2 hr

15 www.agpmeridian.com Next will be the analysis of performance for the above listed cameras as well as new cameras DMCII 250 and UltraCam Eagle using the aircraft King Air 350 The most important characteristics of the cameras Aerial Camera Cross track Size of Final image (pixels) Cross track field of view (°) Pixel Size (μm) Angular Resolution (°) DMC1382469.3120.0054 ADS4012000646.50.0056 A3~950001089.00.0017 UltraCam Eagle 802001066.15.20.0037 UltraCam Eagle 2102001027.85.20.0014 DMCII 2501721646.55.60.0029

16 www.agpmeridian.com The productivity of aerial survey for area 2500 кm 2 for map scale 1:2000 and effective field of view 30°, including turns and transit flights Aerial Camera GSD (сm) Flying Height, m Side Overlap Time Consumption, hr/day Produc- tivity, km 2 /hr Effective Size of Image, pixels Effective field of view (°) DMC18180061.0%11.72/2.2 213 539130 ADS4018173956.5%12.07/2.3 207 522030 A3 18 (17.44) 581369.4% 3.85/0.8649 1755430 UltraCam Eagle 80 18276958.8%7.69/1.5 325 824430 UltraCam Eagle 210 18726930.0%4.38/0.8 571 14007*19.7 DMCII 25018360037.6%6.26/1.2 399 1074330

17 www.agpmeridian.com The productivity of aerial survey for area 2500 кm 2 for map scale 1:5000 and effective field of view 30°, including turns and transit flights Aerial Camera GSD (сm) Flying Height, m Side Overlap Time Consumption, hr/day Produc- tivity, km 2 /hr Effective Size of Image, pixels Effective field of view (°) DMC35350061.0%6.44/1.2 388 539130 ADS4035338256.5%6.62/1.3 377 522030 A3 28.9 (28.0) 933381.0% 2.95/0.6847 1755430 UltraCam Eagle 80 35538558.8%4.02/0.8 625 824430 UltraCam Eagle 210 24928830.0%3.67/0.7 681 14007*19.7 DMCII 25035700037.6%3.31/0.6 756 1074330

18 www.agpmeridian.com The productivity of aerial survey for area 250000 кm 2 for map scale 1:10000 and effective field of view 53°, including turns and transit flights Aerial Camera GSD (сm) Flying Height, m Side Overlap Time Consumption, hr/day Produc- tivity, km 2 /hr Effective Size of Image, pixels Effective field of view (°) DMC50500030%128.6/24.7 1943 967651.6 ADS4050483130%148.5/28.6 1683 840047.0 A3 29.6 (28.00) 933364.8% 57.2/11.44371 3139653.0 UltraCam Eagle 80 50769230%89.6/17.2 2790 1400748.9 UltraCam Eagle 210 23928830%193.3/37.8 1293 1400719.7 DMCII 25046920030%112.6/21.7 2219 1205133.5

19 www.agpmeridian.com The productivity of aerial survey for area 250000 кm 2 for map scale 1:25000 and effective field of view 53°, including turns and transit flights Aerial Camera GSD (сm) Flying Height, m Side Overlap Time Consumption, hr/day Produc- tivity, km 2 /hr Effective Size of Image, pixels Effective field of view (°) DMC80800030%80,7/15.5 3098 967651.6 ADS4080772930%92.7/17.8 2696 840047.0 A3 29.6 (28.00) 933364.8% 57.2/11.44371 3139653.0 UltraCam Eagle 80 60923130%74.7/15.4 3348 1400748.9 UltraCam Eagle 210 ---- - -- DMCII 25046920030%112.6/21.7 2219 1205133.5

20 www.agpmeridian.com When estimating the expenditure of time, have been used the following conditions of flight Speed520 km/hr Transit time from the airport0.4 hr Transit time to the airport0.4 hr Flight time 5.2 hr

21 www.agpmeridian.com Productivity and Effective Image Size Map scale 1:2000, GSD=18 cm Aerial Camera Productivity, km 2 /hr Effective Size of Image, pixels Relative Productivity Relative Effective Size of Image GSD (cm) DMC2135391 11 18 ADS402075220 0.97 18 A364917554 3.053.26 18 UltraCam Eagle 80 3258244 1.53 18 UltraCam Eagle 210 57114007 2.682.60 18 DMCII 25039910743 1.871.99 18

22 www.agpmeridian.com Productivity and Effective Image Size Map scale 1:10000, GSD=50 cm Aerial Camera Productivity, km 2 /hr Effective Size of Image, pixels Relative Productivity Relative Effective Size of Image GSD (cm) DMC 19439676 11 50 ADS40 16838400 0.87 50 A3 437131396 2.243.24 29.6 UltraCam Eagle 80 279014007 1.44 50 UltraCam Eagle 210 -- -- - DMCII 250 221912051 1.141. 24 46

23 www.agpmeridian.com All mentioned aerial cameras provide reception of stereo pairs of images for the stereoscopic interpretation and precise spatial measurements Each of aerial cameras type has its advantages and opportunities

24 www.agpmeridian.com DMC Spectral type of images: RGB,R,G,B, NIR Absence of necessity in control points Absence of necessity in aerial triangulation for scales1:5000 and 1:25000 Possibility of simultaneous execution of air laser scanning to capture DTM for spatial resolution photos 50 cm.

25 www.agpmeridian.com ADS 40 Spectral type of images: RGB,R,G,B, NIR Absence of necessity in control points Absence of necessity in aerial triangulation for scales1:5000 and 1:25000 Possibility of simultaneous execution of air laser scanning to capture DTM for spatial resolution photos 50 cm. The possibility of obtaining options stereo pairs of images with different ratio В/Н

26 www.agpmeridian.com А3 Spectral type of images: RGB Absence of necessity in control points for scales 1:5000 и 1:25000 The highest performance of aerial survey The spatial resolution is 28 cm (nadir) and limited by the flight altitude. Such high resolution provides higher image interpretation properties that makes possible to use the results of aerial survey in creation of maps at scale 1:2000 covering, for example inhabited localities

27 www.agpmeridian.com Conclusions Productivity of aerial survey of large territories is proportional to effective size of image in pixels provided by digital aerial camera (for specified GSD)

28 www.agpmeridian.com Conclusions Modern digital aerial cameras provide high performance and efficiency of aerial survey, opportunities and significant advantages in aerial image processing for production of maps covering large areas

29 www.agpmeridian.com Conclusions 250 000 km 2 for map scales 1:5000, 1:10000 in 12 days !

30 www.agpmeridian.com Thank you for your attention


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