What is EnviSat ASAR?
The Advanced Synthetic Aperture Radar (ASAR) instrument was an active radar sensor on-board the Envisat satellite, which was operational from March 2002 until the unexpected loss of contact in April 2012. ASAR built upon the Active Microwave Instrument (AMI) carried aboard the ERS satellites.
What is EnviSat used for?
Launched in March 2002, Envisat is the largest Earth Observation spacecraft ever built. It carries ten sophisticated optical and radar instruments to provide continuous observation and monitoring of the Earth’s land, atmosphere, oceans and ice caps.
What are the two type of ERS?
The ERS programme was composed of two missions, ERS-1 and ERS-2, which were launched into the same orbit in 1991 and 1995 respectively. The two spacecraft were designed as identical twins with one important difference – ERS-2 included an extra instrument (GOME) designed to monitor ozone levels in the atmosphere.
What are remote sensing satellites used for?
Remote sensing satellites are also called Earth observation satellites or Earth remote sensing satellites. They’re used as spy satellites or for environmental monitoring, meteorology, and cartography. The most common type are Earth-imaging satellites, which take satellite images similar to aerial photographs.
What is the spatial resolution of Ikonos?
3.2 m MS
| Spectral range PAN (panchromatic) | 0.45 – 0.90 µm |
|---|---|
| Spatial resolution (GSD) | 0.82 m PAN, 3.2 m MS, orbital altitude of 600 km |
| Swath width | 12.2 km |
| Design life | 5 years |
| Optical system parameters |
What orbit is Envisat in?
sun-synchronous polar orbit
Envisat flew in a sun-synchronous polar orbit of about 800 km altitude. The repeat cycle of the reference orbit was 35 days, and for most sensors, being wide swath, it provided a complete coverage of the globe within one to three days.
Is low Earth orbit space?
Low-Earth orbit (often known as LEO) encompasses Earth-centered orbits with an altitude of 2,000 km (1,200 mi) or less. For the purposes of the Commercial Use Policy, low-Earth orbit is considered the area in Earth orbit near enough to Earth for convenient transportation, communication, observation and resupply.
What is ERS data?
The ERS Food Expenditure Series is a comprehensive data set that measures the U.S. food system, quantifying the value of food acquired in the United States by type of product, outlet, and purchaser.
What does the Radarsat 2 do?
Launched on December 14, 2007 , RADARSAT-2 is a Canadian Earth observation satellite. It is used to: monitor the impacts of climate change. protect our environment and foster sustainable development.
What are the 5 types of remote sensing?
Types of Remote Sensing Systems
- Visual Remote Sensing System such as human visual system.
- Optical Remote Sensing.
- Infrared Remote Sensing.
- Microwave Remote Sensing.
- Radar Remote Sensing.
- Satellite Remote Sensing.
- Airborne Remote Sensing.
- Acoustic and near-acoustic remote sensing.
What are the 4 types of resolution?
There are four types of resolution to consider for any dataset—radiometric, spatial, spectral, and temporal. Radiometric resolution is the amount of information in each pixel, that is, the number of bits representing the energy recorded.
WHO launched IKONOS?
Lockheed Martin
Launch of Ikonos-2: The spacecraft was launched successfully on Sept. 24, 1999 from VAFB, CA aboard an Athena 2 launcher of Lockheed Martin. Space Imaging began to sell Ikonos-2 imagery on January 1 2000.
Are all Envisat ASAR products free to use?
All Envisat ASAR products, in accordance with ESA Earth Observation Data Policy, are freely available to ESA EO Sign In registered users. For further details on the (A)SAR Online Dissemination Service (OTF), or other ASAR data products, including information on user access and forthcoming data releases, contact the ESA TellUs Service
What is Envisat?
Envisat provided continuous observation and monitoring of the Earth’s land, atmosphere, oceans and ice caps. Due to its near-Earth polar orbit (782 km mean altitude) and fast cycle time (one orbit in 100 minutes), the mission presented unique challenges for ground communications and data delivery.
What happened to Envisat?
Envisat also carried two atmospheric sensors monitoring trace gases. The Envisat mission ended on 8 April 2012, following the unexpected loss of contact with the satellite.
What is the Envisat on-call service?
The team operated a 7-day-per-week on-call service for engineering and mission planning, ensuring a fast reaction in case of any on-board anomalies, ground segment problems or unforeseen re-planning requests from the Envisat user community.