Digital Aerial Photography UNBC March 22, Presented by: Dick Mynen TDB Consultants Inc.

Transcription

1 Digital Aerial Photography UNBC March 22, 2011 Presented by: Dick Mynen TDB Consultants Inc.

2 Airborne Large Scale Digital Photography Who is using the technology in today s environment Options available How is it being used Strengths vs weakness Differences with conventional airborne photography Terminology Project applications

3 State of the Local Industry Full slate of small, medium and large format digital cameras are now deployed across Canada and used in British Columbia Fisik Aerial Surveys - UltraCamX Aero Photo UltraCamXp Airborne Sensing UltraCam Xp and D AreoMetric DMC II Midwest Aerial Surveys DMC II Selkirk Remote Sensing UltraCamXp (planned) Northwest Geomatics Leica ADS40 II

4 State of the Local Industry Global Remote Sensing Film Wild RC30 Terrasaurus Aerial Photography Twin Canon 1D MarkIII - 21 mp & Alpa Metric P mp WD McIntosh Land Surveying - Canon 32 mega pixel Foto Flight Film Geodesy Remote Sensing Medium Format In Large Format Digital Cameras world wide and by 2010 there are100 of the DMC models alone

5 Medium Format Digital Camera Common Characteristics mm focal length Various configurations of professional to off the shelf or amateur, much bias, labels and distinctions Custom cameras and lenses Capability for Camera Calibration reports has been recently adopted but not widespread Smaller image foot print

6 Large Format Digital Camera Common Characteristics Radiometric resolution of bit better in shadow areas 12,000 (across) -11,000 (along) pixel Single Pass - Panchromatic + 4 multispectral Red, Blue, Green and Near Infrared mm Focal Length pan, 25 mm multispectral New large footprint equal to film

7 Medium Format Sony and Kodak early entry professional digital camera

8 Medium Format Canon EOS1Ds Mark II 60 mm focal length Image size = 4,992 x 3,328 pixels Calibrated

9 Medium Format Imacon Ixpress 132C 60mm lens 4080 x 5440 pixels 10 cm GSD Calibrated

10 Medium Format Imacon Ixpress 132C Dual Camera configuration

11 Medium Format Applanix 22.2 mega pixel 5,436 x 4,092 pixel image 60 mm focal length sec shutter speed RGB and CIR

12 Medium Format Rollei AIC 22 mega pixel 5,440 x 4,080 pixel image shutter speed 50 mm focal length 4 channel RGB Minimal moving parts Aluminums alloy1 piece body

13 Medium Format - limited success Intergraph Ziess introduced it s first medium format camera RMK D in 2009 Limited Success 8 cm GSD at 500 m flying height 14 bit per pixel for lower light conditions 4 band imagery with single pass Digital forward motion compensators

14 Large Format Early Model Microsoft s Vexcel UltraCam D smallest pixel size at 1,000 ft or 300 m flying height = 1.1 or 3 cm 11,500 x 7,500 pixels 4 channel RGB and NIR captures up to 2,692 images at 20 cm GSD in 5 hrs ~ 1:10,000 film scale = ~ 1.5 terabytes

15 Large Format Latest Model Microsoft s Vexcel UltraCam Xp smallest pixel 300 m flying = m flying = 2.9 cm 17,310 x 11,310 pixels 104 mm focal length Similar to film 23 cm x 15 cm 4 channel RGB & NIR Holds up to 4,700 images with extra capacity for up to 9,400 images in one flight

16 Large Format Early model Ziess/Intergraph DMC(Digital Mapping Camera) smallest pixel size at 1,000 ft or 300 m flying height = 1.5 or less then 4 cm 13,824 x 7,680 pixel image 120 mm focal length 4 channel RGB and NIR

17 Large Format New model Ziess/Intergraph DMC II smallest pixel size at 500 m flying height = 3.9 cm 7.2 micron = 12,096 x 11,200 pixel image 92 mm focal length 5 channel Pan, RGB, NIR 2 sec frame rate

18 Focal Length / Footprint

19 Large Format Leica Geosystems ADS40-II Line sensor technology capable of 5-10 cm GSD at 1:500 scale Focal Length 62.77mm 12,000 pixel array Resolution of Pan image and RGB images are the same, no processing required

20 Large Format - Film Wild RC20 and the Leica (Wild) RC30

21 Digital advantages over film Offers a faster, and now noticeably a better solution to conventional film-based aerial imaging In addition, digital images contain no analog anomalies such as scratches, lint, dust or grain-noise Radiometric clarity is the most evident advantage that digital sensors have over analog technology Forward-motion compensation can support pixels as small as two centimetres on the ground. No film developing or scanning No noise from film grain, no film, developing, scanning

22 Film and Digital Terminology Photo Scale spec is now referred more to the Ground Scale Distance GSD Ground Scale Distance Distance between the neighboured pixel centers projected on the ground Film at 230 mm x 230 mm = 18,400 pixels Large format digital is now capable of 18,000 x 12,000 pixels

23 Digital vs Film Photo prints can now be created with similarity from film or digital solution Foot print issue is now similar Less or equal flying weather windows Less photo control required overall with IMU and now similar foot print Biggest difference today availability and cost (film and cameras)

24 Small-Medium Digital vs Large Format Digital or Film Low cost digital solutions can produce inferior image results when used for large projects Low cost solutions may incorporate inferior Forward Motion Compensation solutions. Results in a typically more expensive acquisition phase, though can be offset with reduction in costs for other phases. (scanning developing) Can require up to 3 times more flying.

25 Recent TDB Projects/Applications BC/Alaska border 3,000+ images - Film Yukon Mine 300+ images Film BC Silviculture Surveys Film & Digital Province of PEI -1,800 images - Digital New Brunswick Region 3,200 images - Film Ottawa Region 1,000+ images - Digital All new provincial projects in BC are going Digital Camera Technology

26 Thank you!