1. Satellite Image Pixel Size vs Mapping Scale
(using one pixel = 0.3 mm on a map)
* OrbView-3 has the same spatial resolution

4. Landsat

5. SPOT-5 5m

6. SPOT-5
Fused image of 10m multispectral and 2.5m pan

7. What Is QuickBird Imagery?
Highest ground resolution satellite data commercially available
61cm/pixel size b/w, 2.44m/pixel size colour
Obits at 450 km
Minimum order size 272 km2
US$29/ km2

8. What Can You See With High-Res Imagery?

9. Quickbird / Ikonos

11. Shadow areas

13. QB-IK Change Detection Image
Newly exposed areas are yellow-red and newly regenerated areas are green-blue. Areas with relatively little or no change are shown in purple tones.

14. C&E - canopy gap ID

15. DEM capability

16. Costs Image acquisition cost 2000 price = $0.21/ha
$3360/1:20,000 map sheet
Image will have < 20% cloud cover
Image processing/orthorectification cost
$1500 for average scene

17. Optical Satellite Imagery Aerial Photography (Film Based)
Satellite Imagery vs Aerial Photos
Optical Satellite Imagery
Aerial Photography (Film Based)
Price increases linearly with area increase.
Price increases at a lower rate with area increase.
Data captured digitally so no film to process.
Photos typically captured on film. Require scanning and corrections for flying direction.
Cloud cover a problem. Revisit of 3+ days.
Can fly below clouds, or fly another day.
61cm currently finest ground resolution.
Can produce images down to a few centimetres by varying flying height.
Imaging in both visible and near infrared parts of spectrum simultaneously.
Film-based cameras typically image using colour, b/w or near-infrared film separately.
A single scene for urban applications covers 10x10km or 16x16km (IK and QB).
@1:40,000 scale photo for 1m pixel, the useable area in 1 frame is 3.6 km x 6.4 km
Less mosaicking required.
More mosaicking required.
North-South imaging easier than East-West due to near polar satellite orbit.
Any direction for imaging is OK.
On average a suitable image available 7 days after ordering an image. Up to a month for very cloudy/rainy areas.
Depends upon availability of aircraft and weather. C C C C C C C C C C

18. Next Generation Satellites
WorldView – launch 2006
50 cm panchromatic resolution
2.0-meter multispectral resolution
Orbview-5 – launch 2007
41 cm panchromatic resolution
1.64 m MSS

19. High Resolution Imagery - Summary
Strengths
Provide good input for mapping, inventorying, monitoring, prioritizing inspections, surveying of high priority areas
Information captured in digital format plus provides visible and NIR spectral information
Allows digital processing / interpretation / change detection
11 bit data better for shadowed areas
Weaknesses
Cost (US$ 29/km2 for b/w + colour)
Min order size 272 km2
Cloud cover (up to 20%)
Need to order for future date (for low demand areas)

20. CONCLUSIONS
High-resolution satellite imagery is a new tool that can be used cost effectively for high priority areas.
For aerial coverage - the sky is no longer the limit !

21. Satellite Imagery vs Aerial Photo Prices
Orthorectified
US$ prices (based on an area of 121 km2)
Sarah R. Finley, “High-Resolution Satellite Imagery and Resource Management – Fact Sheet 3”, University of Minnesota, Dept. of Forest Resources.