Minimize Level-1 Extra Wide Swath SLC Products

The EW SLC products contain one image per sub-swath, per polarisation channel, for a total of five or ten images. Each TOPSAR EW burst in a sub-swath is processed as a separate SLC image, and included in a sub-swath image exactly as in the IW case. Like the IW mode, EW is a one natural azimuth look mode, and therefore the EW and IW images have similar properties. As for the IW SLC products, the images for all bursts in all sub-swaths of an EW SLC product are re-sampled to a common pixel spacing grid in range and azimuth.

The following properties are particular to each sub-swath of the EW mode.

Beam ID EW1 EW2 EW3 EW4 EW5
Spatial Resolution rg x az m 7.9x43.7 9.9x44.3 11.6x45.2 13.3x45.6 14.4x44.0
Pixel spacing rg x az m 5.9x19.9 5.9x19.9 5.9x19.9 5.9x19.9 5.9x19.9
Incidence angle ° 23.7 30.9 36.2 40.9 44.5
Range look bandwidth MHz 22.2 15.1 12.9 11.3 10.4
Azimuth look bandwidth Hz 225 154 151 149 154
Range Hamming weighting coefficient 0.60 0.75 0.75 0.75 0.75
Azimuth Hamming weighting coefficient 0.50 0.75 0.75 0.75 0.75

The following are the properties that are common for all sub-swath of the EW mode:

Product ID EW_SLC
Pixel value Complex
Coordinate system Slant range
Bits per pixel 16 I and 16 Q
Polarisation options Single (HH or VV) or Dual (HH+HV or VV+VH)
Ground range coverage km 410
Equivalent Number of Looks (ENL) 1
Radiometric resolution 3
Absolute location accuracy m (NRT) Not specified
Number of looks (range x azimuth) 1 x 1