Radar imagery
WHAT IS THIS?
Radar imagery is an active remote sensing system which bounces microwave energy from a target and records the energy that returns to the sensor.
Radar data processing
- Change detection analysis with the accuracy of several cm;
- Structures deformation measurements with the accuracy of several mm;
- Establishing trends and forecasting.
Interferometric synthetic aperture radar (InSAR)
Interferometric synthetic aperture radar (InSAR) techniques combine two or more SAR images over the same region to reveal surface topography or surface motion. If the combined SAR images originate from slightly different positions, the topography of the surface can be mapped. In contrast, if images from the same position but taken at different times are combined, the difference between them will show motion, or deformation, of the surface in the time between the two images.
Processing methods
Differential SAR Interferometry (DInSAR)
Basic method of SAR data interferometric processing. Differential interferometry (DInSAR) can detect movements in the radar look direction that are in the order of wavelength used, i.e. less than one centimetre
Permanent Scatterer Interferometry (PSInSAR)
This method accurately estimates the near vertical terrain deformation rates, of the order of ∼1 mm year-1, overcoming the physical and technical restrictions of classic InSAR.
Small baseline interferometry (SBAS)
SBAS technique is a time series analysis approach, which uses interferograms with small baselines to minimize geometrical decorrelation at the expense of spatial resolution.
Industry solutions
Industry solutions
AgricultureSatellite SAR imagery helps to monitor crops and fields remotely over time. Farmers can use imagery to get an aerial view of various fields and crops to look for changes or differences.
Water managementSatellite Synthetic Aperture Radar is a popular solution for mapping and monitoring surface water features, to distinguish water from non-water. It is important for sustainably managing this critical natural resource.
ForestryRadar satellite technology with its capability to penetrate clouds is often used for investigating tropical forests as they are most of the time under clouds. Radar is also able to capture images through darkness which can be of great benefit for tracking nighttime illegal activities.
Terrain analysisSAR imagery is perfectly used for monitoring critical areas for many branches of human activity: construction, industry, scientific research and geological exploration of territories.
Radar satellites
KOMPSAT-5
KOMPSAT-5 is part of the Korean National Development Plan of MEST (Ministry of Education, Science and Technology). The primary mission objective is to provide imagery for geographic information applications and to monitor environmental disasters.
Sentinel-1A, 1B
Sentinel-1A and Sentinel-1B are European radar satellites. The first satellites launched under the European Space Agency's (ESA) Copernicus space program. While in the same orbit, both satellites can film the entire territory of the Earth within 6 days.
COSMO-SKYMED 1-4
TerraSAR-X
TerraSAR-X is a satellite with a 1 meter resolution class radar satellite, which delivers Earth observation data for scientific, institutional and commercial users.
Radarsat-2
RADARSAT-2 is a jointly-funded satellite mission of CSA (Canadian Space Agency) and MDA (MacDonald Dettwiler Associates Ltd. of Richmond, BC), representing a Canadian government/industry partnership [or PPP (Public Private Partnership)] in a commercial venture.
Radarsat Constellation 1, 2, 3
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