With complex-valued imagery, CATALYST Enterprise Satellite converts the input data set to PCIDSK complex-imagery format, which is required for processing with synthetic aperture radar (SAR) modules.
The matrix type is determined automatically during data ingest and depends on the type and format of the input data described herein.
Each matrix element is stored as a single channel, with complex-valued channels containing both the real and imaginary components of the complex number. Internal metadata is used to define the matrix representation for each file. The adopted notation is to identify the matrix type as one of scattering (S), covariance (C), coherence (T) or Kennaugh (K), followed by the number of real (r) and complex-valued (c) layers.
For example, a covariance matrix containing four real-valued channels and six complex-valued channels will be identified as C4r6c, while a scattering matrix containing four complex-valued channels will be identified as S4c. Symmetrized matrix types contain averaged cross-polarization information (HV = VH = (HV + VH)/2) and are designated by matrix types in lowercase. A symmetric-scattering matrix will be designated as s3c, while a symmetric-covariance matrix is designated as c3r3c.
Each value is stored as a floating-point number. With detected data, CATALYST Enterprise Satellite determines the output bit depth and channel type from the input bit depth.
Supported sensors
Imported data products
SLC represents Single Look, Complex, georeferenced data in slant-range coordinates.
GRD or GRC represent GRound range, georeferenced, Detected or Complex products. GRD is equivalent to an SGX, SCN, or SCW product for RADARSAT-1 or RADARSAT-2.
GCD or GCC represent GeoCoded Detected or Complex products. GCD is equivalent to an SSG or SPG product for RADARSAT-1 or RADARSAT-2.
Capella GEO and SLC products are imported.
Metadata
In addition to image and segment data, the algorithm extracts metadata related to SAR processing and writes it to the output file. There are two levels of metadata: file and channel.
At the file level, SAR metadata contains information that relates to the data set as a whole, including:
At the channel level, metadata for polarimetric data identifies the matrix element stored in the channel:
Matrix_Element: Describes the row and column position of the element in the matrix.
For example, with a data set stored as an s4c matrix, the first channel is identified as _1_1 and the second channel is identified as _1_2.
CATALYST Enterprise SAR can be extended to handle other sensors and data sets.
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