Minimize Level-1 Interferometric Wide Swath SLC Products

The IW SLC product contains one image per sub-swath, per polarisation channel, for a total of three or six images. Each sub-swath image consists of a series of bursts, where each burst was processed as a separate SLC image. The individually focused complex burst images are included, in azimuth-time order, into a single sub-swath image, with black-fill demarcation in between

Unlike SM and WV SLC products, which are sampled at the natural pixel spacing, the images for all bursts in all sub-swaths of an IW SLC product are re-sampled to a common pixel spacing grid in range and azimuth. The resampling to a common grid eliminates the need of further interpolation in case, in later processing stages, the bursts are merged to create a contiguous ground range, detected image.

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

Beam ID IW1 IW2 IW3
Spatial Resolution rg x az m 2.7x22.5 3.1x22.7 3.5x22.6
Pixel spacing rg x az m 2.3x14.1    2.3x14.1    2.3x14.1
Incidence angle ° 32.9 38.3 43.1
Range look bandwidth MHz 56.5 48.3 42.8
Azimuth look bandwidth Hz 315 301 301
Range Hamming weighting coefficient 0.75 0.75 0.75
Azimuth Hamming weighting coefficient 0.70 0.75 0.75


The following properties are common to all sub-swaths of the IW mode:

Product ID IW_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 251.8
Equivalent Number of Looks (ENL) 1
Radiometric resolution 3
Absolute location accuracy m (NRT) 7
Number of looks (range x azimuth) 1 x 1