mysql_connect RADARSAT Satellite Data

RADARSAT

RADARSAT-2, the next-generation commercial SAR satellite, was launched in December, 2007.

RADARSAT-2 has been designed with significant and powerful technical advancements which include 3m high-resolution imaging, flexibility in selection of polarization, left and right-looking imaging options, superior data storage and more precise measurements of spacecraft position.

Example imagery captured in 2008

Benefits
Spatial Resolution 3 to 100 metres
  • Suite of spatial resolution options accomodates a wide range of applications
  • Ultra-fine beam will improve object detection and recognition
Polarization HH, HV, VV and VH
  • Better discrimination of various surface types and improved object detection and recognition
Look Direction Routine left- and right-looking operation
  • Increased re-visit time for improved monitoring efficiencies
Onboard Recording Device Solid-state recorders
  • High reliability
  • Simultaneous reading and writing
  • Guarantees image acquisition anywhere in the world for subsequent downlinking
Onboard Location Accuracy Device GPS receivers onboard
  • ±60 metre real-time position information
  • Increased geometric accuracy, particularly without control points, provides more accurately positioned fast delivery products
Yaw-steering Yaw-steering for zero Doppler shift at beam centre
  • Facilitates image processing


Radar Instrument Characteristics
SAR Antenna Dimensions 15m x 1.5m
Frequency Band C-Band (5.405 GHz)
Channel Bandwidth 11.6/17.3/30/50/100 MHz
Channel Polarization HH, HV, VH, VV

SAR Imagery

SAR imagery has proved its usefulness to applications both onshore and offshore for a number of years now. Its capability to penetrate cloud, rain, dust and haze allows data to be collected both day and night. This is particularly useful where persistent cloud cover or poor illumination hamper the collection of optical data. In contrast to optical imagery, SAR is an active sensor. The return signal strength depends primarily on:

  • The dielectric property of the surface (e.g. metals reflect more than vegetation)
  • The roughness of the surface (e.g. rough versus calm water)
  • The slope of the ground imaged
  • The range of the ground imaged from the satellite