Lecture 11 Flashcards
Landsat 8 differences
pushbroom, 12 bits instead of 8, thermal sensor has two (not one) bands, more spectral bands (blue, band 5, shortwave IR, two thermal bands)
SPOT
review slides, compare which is higher/lower
Things to do
make comparison chart/charts for various sensors/satellites–see slide in lecture 11 (blue)
IKONOS
see slide
Quickbird
see slide
WorldView-1
see slide
WorldView-2
see slide–
High resolution, so good for map creation and change detection
Data Fusion/Panchromatic Sharpening
The algorithm applies an automatic image fusion that INCREASES THE RESOLUTION of multispectral (color) image data by using a high-resolution panchromatic (B&W) image.
Most Earth resource satellites provide multispectral images at a lower resolution and panchromatic images at a higher resolution. This allows fuse images acquired simultaneously by the same or different sensors
NEW LECTURE STARTS
HERE
Corona Program history
In 1955 (Cold War, Eisenhower suggested to Khrushchev that each country allow the other to conduct reconnaissance flights in the air and from space over the other country, and that the imagery obtained be given to the United Nations • Khrushchev declined, and both countries proceeded to develop surveillance programs in secret • In 1958, the Air Force abruptly canceled a planned satellite system that was classified but had been publicly acknowledged, and reconstituted it as the super-secret Corona reconnaissance satellite program. It was organized under the new Keyhole security protocols, the most secret security orders in American history.
Where did Mylar come from?
Corona featured an evolving series of extremely sophisticated cameras that used a special polyester film base designed just for the program - though we all use it now, under its later name “Mylar”.
Compare Corona and Sputnik
Corona: Discoverer 14 film bucket was successfully retrieved 2 days later by a C-119. This was the first successful return of photographic film from orbit
• Sputnik 5 lone day after Discoverer 14. Sputnik 5 took into orbit and safely returned two soviet space dogs
Corona program benefits
- After launch in 1960, government realized there were civilian applications
- CIA was using Corona to map the world, remap the U.S., and to evaluate all 1:24,000 topographic maps for revision.
- The Corona Program continued until 1972, when it was replaced by more advanced systems, such as Big Bird, which use digital imagery. It was not until late 1995 that the U.S. government finally acknowledged the existence of Corona.
- Corona was a very successful program. It produced over 800,000 images taken from space, and 2.1 million feet of film, delivered in 39,000 cans. Individual images on average covered approximately 10 miles by 120 miles.
- All 800,000 Corona images are now declassified and can be ordered through the USGS (references)
SAURON
( Semi-Autonomous Ultra-high- Resolution Orbital Network)
launched in 2013–see slide
Metsats
- Metrological satellites
- designed to assist in weather prediction
- coarse resolution compared to earth-oriented satellites
- global coverage at high temporal resolution
- The U.S Metsats are NOAA-POES, NOAA-GOES, and DMSP
