Spencer Anderson Brent Fogleman Daryl Vonhagel

 Objectives:  C-band (w = 3.8 – 7.5 cm) & X-band (w = 2.4 – 3.8 cm) IFSAR to acquire topographic data over 80% of Earth’s land mass  Produced digital topographic maps with: ▪ 30m x 30m spatial sampling ▪ <= 16 m absolute vertical accuracy ▪ <= 10 m relative vertical accuracy ▪ <= 20 m absolute horizontal circular accuracy

DATA COVERAGE: Shuttle Radar Topography Mission collected data over most of the land surfaces that lay between 60 degrees north latitude and 54 degrees south latitude. That's about 80% of all the land on the Earth. Data Statistics Land coverage: Targeted land was 80% of Earth landmass ( M km 2, M mi 2 ) % targeted land mapped at least once ( M km 2, M mi 2 ) 94.59% targeted land mapped at least twice ( M km 2, M mi 2 ) 49.25% targeted land mapped at least 3 times (58.59 M km 2, M mi 2 ) 24.10% targeted land mapped at least 4 times (28.81 M km 2, M mi 2 ) Land area missed:50,000 km2 (all in US) Radar system acquired topographic data for >47.6 million miles 2 of Earth Total imaging time: ~10 days 99.96% of planned coverage area mapped during STS-99 Space Shuttle mission Sophisticated radar collected surface imaging data at a rate of 40,000 miles 2 / min

SRTM SAR ASTER

 Circular, sun-synchronous, and near polar  Nominal altitude: 705 km at Equator  Crosses Equator from N to S on descending orbital node between 10:00 and 10:15 AM each pass  Speed: 7.5 km/sec; period ~ 99 min; 14 orbits/day  Covers entire Earth between 81 deg N & S every 16 days  Multispectral data set with both high (30m) & medium to coarse (250 to 1000 m) spatial resolution acquired on a global basis repetitively

 Scene Size:  183 km cross-track, 170 km along track  3.6 Gbits in 24 seconds  Instantaneous FOV: 30m pixel  Radiometric Accuracy: 5% absolute, 2% relative  Data Rate: 150 Mbps on two 75 Mbps channels (I & Q)  Scan Frequency: 7 Hz

 Enhanced Thematic Mapper Plus (ETM+) Eight spectral bands, including panchromatic and thermal band:  Band 1 Visible (0.45 – 0.52  m) 30 m  Band 2 Visible (0.52 – 0.60  m) 30 m  Band 3 Visible (0.63 – 0.69  m) 30 m  Band 4 Near-Infrared (0.77 – 0.90  m) 30 m  Band 5 Near-Infrared (1.55 – 1.75  m) 30 m  Band 6 Thermal (10.44 –  m) 60 m  Band 7 Mid-Infrared (2.08 – 2.35  m) 30 m  Band 8 Panchromatic(0.52 – 0.90  m) 15 m  Ground sampling Interval (pixel size): 30 m reflective, 60 m thermal  Added the Band 6 Low and High gain 60 m thermal bands  On-board calibration was added to Landsat 7: a Full Aperture Solar Calibrator (FASC) and a Partial Aperture Solar Calibrator (PASC); in addition to the 2 calibration lamps