SIR-C

Sensor SIR-C (Spaceborne Imaging Radar - C Band)
Platform NASA Space Shuttle Endeavour
Data distributor SIR-C data is available from the US Geological Service National Center for Earth Resources Observations and Science (EROS, http://edc.usgs.gov).
Sections

Data product name and version
Distribution disk files
Returned data
Returned metadata
References

Data product name and version

Short Name Long Name Version
SLC-Q Single Look Complex, Standard Quad Polarization None
SLC-D Single Look Complex, Standard Dual Polarization None
MLC-Q Multi-look Complex, Quad Polarization None
MLC-D Multi-look Complex, Dual Polarization None

Distribution disk files

SPW can read this data product without prior conversion.

File Name File Type Required Contents Details
pr*_ldr_ceos CEOS leader, a binary file format. Yes Detailed header information for the data set. The asterisk (*) is replaced by the data set processing number.
pr*_img CEOS image descriptor, a binary file format. Yes Detailed information about image properties. The asterisk (*) is replaced by the data set processing number.
pr*_img_ceos CEOS image data, a binary file format. Yes All raster data in the data set. The asterisk (*) is replaced by the data set processing number.
pr*_tlr_ceos CEOS image trailer, a binary file format Yes Detailed information about how the image is processed by way of the CEOS format data reader. The asterisk (*) is replaced by the data set processing number.

To import the data, you have to select a single file that represents the data type to GDB. This file is called the "key file". For SIR-C, pr*_ldr_ceos is the key file.

Returned data

Data product Data returned Details
SLC-Q Eight rasters and one array segment.

The rasters are spatially coincident and represent the real and imaginary components of each of all four independent complex elements of the non-symmetric Sinclair scattering matrix (s4c).

The rasters conform to SAR slant-range geometry.

The array segment contains an incident angle value (in degrees) for each range sample location.

SLC-D Four rasters and one array segment.

The rasters are spatially coincident and represent the real and imaginary components of each of two elements of the non-symmetric Sinclair scattering matrix (s2c).

The two elements represent the polarization pairings HH and VV, HH and HV, or VV and VH.

The rasters conform to SAR slant-range geometry.

The array segment contains an incident angle value (in degrees) for each range sample location.

MLC-Q Nine rasters and one array segment.

The rasters are spatially coincident and represent the three real and three complex independent elements of the symmetric covariance matrix (C3r3c).

Each complex element is represented by two rasters: one for the real component and one for the imaginary component.

The rasters conform to SAR slant-range geometry.

The array segment contains an incident angle value (in degrees) for each range sample location.

MLC-D Four rasters and one array segment.

The rasters are spatially coincident and represent the two real and one complex element of the incomplete covariance matrix (c2r1c).

The complex element is represented by two rasters: one for the real component and one for the imaginary component.

The three elements represent the polarization pairings HH and VV, HH and HV, or VV and VH.

The rasters conform to SAR slant-range geometry.

The array segment contains an incident angle value (in degrees) for each range sample location.

Returned metadata

Returned metadata that applies to SLC-Q, SLC-D, MLC-Q, and MLC-D data sets as a whole:

Name Description Values
SensorModelName The model name of the sensor that acquired the data. SIR-C
SensorType The sensor type. SAR
ProductType The data product type.

For SLC-Q and SLC-D, the value is SLC.

For MLC-Q and MLC-D, the value is MLC.

MatrixType The type of the matrix whose elements correspond to rasters in the data set.

For SLC-Q, the value is s4c.

For SLC-D, the value is s2c.

For MLC-Q, the value is C3r3c.

For MLC-D, the value is c2r1c.

NumLooks The number of looks processed in range and azimuth.

For SLC-Q and SLC-D, the value is 1.

For the other products, the value is greater than 1.

AcquisitionType    
SARCalibration The SAR-related calibration that is applied to the image pixel values as they are read from the file. sigma0
MicrowaveBand The microwave frequency band in which the sensor operated during data acquisition. C, L
Polarizations The set of <transmit, receive> polarization pairs that is represented by the data set.

For SLC-Q, the value is (HH, HV, VH, VV).

For SLC-D, the value is one of: (HH, VV), (HH, HV), (VV, VH).

For MLC-Q, the value is (HH, HV, VV).

For MLC-D, the value is one of: (HH, VV), (HH, HV), (VV, VH).

Returned metadata applies to individual rasters in SLC-Q, SLC-D, MLC-Q, and MLC-D data sets:

Name Description Values
MatrixElement

The row and column position and number component (complex or real) of the matrix element to which the raster corresponds.

A real-valued matrix element has only a real component and is represented by one raster.

A complex-valued matrix element has both a real and an imaginary component, and is represented by two rasters.

Possible values for SLC-Q and SLC-D: real_1_1, imaginary_1_1, real_1_2, imaginary_1_2, real_2_1, imaginary_2_1, real_2_2, imaginary_2_2.

Possible values for MLC-Q: real_1_1, real_2_2, real_3_3, real_1_2, imaginary_1_2, real_1_3, imaginary_1_3, real_2_3, imaginary_2_3.

Possible values for MLC-D: real_1_1, real_2_2, real_1_2, imaginary_1_2, real_3_3, real_4_4, real_3_4, imaginary_3_4, real_1_4, imaginary_1_4.

References

NASA, SIR-C/AIRSAR Data Conversion Guide, JPL D-11836, Revision 1.0. June 1994.

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