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.
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 |
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 |