remote sensing of our environment
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Remote Sensing of Our Environment. Using Satellite Digital Images to Analyze the Earth’s Surface. CIR Film at Close Range. Air Photos. Artist’s Rendition of SPOT Satellite. Definition of Remote Sensing. - PowerPoint PPT PresentationTRANSCRIPT
Remote Sensing of Our Environment
Using Satellite Digital Images to Analyze the Earth’s Surface
CIR Film at Close Range
Air Photos
Artist’s Rendition of SPOT Satellite
Definition of Remote Sensing
• Remote sensing is the science and art of acquiring information (spectral, spatial, temporal) about material objects, area, or phenomenon, without coming into physical contact.
EMR
• In remote sensing, information transfer is accomplished by use of electromagnetic radiation (EMR).
Electromagnetic Radiation
Electromagnetic Spectrum
Geraniums - Normal Color Film
Geraniums - CIR Film
Normal Color/CIR Comparison
Thermal Radiometer
Archeology Site - South Dakota
Big Brother Watching…..
Interactions between Matter and Electro-magnetic Radiation
• All matter reflects, absorbs, penetrates and emits electro-magnetic radiation in a unique way.
• For example, the reason why a leaf looks green is that the chlorophyll absorbs blue and red spectra and reflects the green spectrum
Types of Remote Sensing with Respect to Wavelength Regions
• Remote sensing is classified into three types with respect to the wavelength regions; – (1)Visible and Reflective Infrared Remote
Sensing, – (2)Thermal Infrared Remote Sensing and– (3)Microwave Remote Sensing
Spectral Reflectance of Land Covers
Spectral reflectance of vegetation, soil and water
Spectral Reflectance of Land Covers
Spectral reflectance of different kinds of trees
Landsat MSS - Where??
Where?
Where?
Where?
Where?
Gemini Film Image
What Season?
See the Line?
Significant Variations in Land Cover and Land Use
Ready to Go!
What Scale?
MSS vs. TM
SPOT - Washington DC
Pacman Farm….
Gharb, Morocco
Gharb - Pre-Harvest
Gharb - Post-Harvest
Sakur, Japan
Chernobyl - 1986
Ocean Measurements
California Mosaic
Resolution
• Spectral Resolution
• Radiometric Resolution
• Spatial Resolution
• Temporal Resolution
Landsat MSS
• Spectral Resolution– Band 4 (0.5 – 0.6 um, green)– Band 5 (0.6 – 0.7 um, red)– Band 6 (0.7 – 0.8 um, photo IR)– Band 7 (0.8 – 1.1um, near IR)
• Radiometric Resolution– 1 byte (256 levels (0 – 255))
• Spatial Resolution– 80m (260ft)
• Temporal Resolution– 16 days
Landsat MSS
• Orbital altitude – 570 miles
• 11.560 FOV – 115 mile swath
SPOT
• Spectral Resolution– Band 1 (0.50 – 0.59 um, green)– Band 2 (0.60 – 0.68um, red)– Band 3 (0.79 – 0.89um, RIR)
• Radiometric Resolution– 1 byte
• Spatial Resolution– 20m
• Temporal Resolution– 26 days vertically downward. Can move mirror 270, increasing
repeatability to 7x in 26 days.
SPOT
• Orbital altitude – 516 miles
• 73 mile swath
Commercialization of Space Remote Sensing
Here is a SpaceImaging high resolution panchromatic scene that shows the pyramids outside of Cairo, Egypt
Quickbird-2 is the flagship of Digital Globe
The Pentagon (a year after it was damaged by a terrorist air assault) on the Virginia side of the Potomac River outside Washington, D.C.
2.8m spatial resolution.
IKONOS
• 1999 launch
• Spatial Resolution: – B/W: 82-cm– Multispectral: 4-meter
IKONOS
• Spectral Range– 526–929 nm
445–516 nm (blue)506–595 nm (green)632–698 nm (red)757–853 nm (near IR)
• Revisit Time– Approximately 3 days
GeoEye-1 and IKONOS Comparison
Satellite Feature GeoEye-1 IKONOS
Panchromatic Resolution .5-meter 1-meter
Multispectral Resolution 1.64-meter 3.28-meter
Spectral Range R G B IR R G B IR
Launch Date 9/6/08 9/24/99
Orbit Altitude 681-km/423-miles 681-km/423/miles
GeoEye-1: Ayers Rock
GeoEye-1: Canyonlands, Utah
GeoEye-1: El Capitan
GeoEye-1: Kenai Fjords National Park, Alaska
GeoEye-1: The Moon
GeoEye-1: Niagara Falls
GeoEye-1: Rainbow Bridge, Utah
GeoEye-1: Nile River Delta
GeoEye-1: Burning Man 2009
GeoEye-1: Burning Man 2009
GeoEye-1: Sand & Gravel Plant Arkansas
GeoEye-1: Sand & Gravel Plant Arkansas
Aster: Yukon Delta
Military Intelligence Satellites
The KH-12 series, the last for which some specifications can be found, is reputed to achieve a resolution of 2+ cm, although images of this sharpness haven't been released.
US Spy Imagery Sources
• U-2 • SR-71 • TARPS (Tactical Airborne Reconnaissance Pod System) • ATARS (Advanced Tactical Airborne Reconnaissance System) • Predator UAV TESAR (Synthetic Aperture Radar) • Predator UAV Electro-optical • KH-4 CORONA • KH-5 ARGON • KH-11 KENNAN/CRYSTAL • KH-12 IMPROVED CRYSTAL
Spatial Resolution Detection vs.Recognition
NYC Landsat TM
Landsat 5 NYC
(summer 1997)
ASTER: NYC - 9/22/02