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<html><head><title>AIRSAR -- AIRSAR Polarimetric Format</title></head><body bgcolor="#ffffff"><h1>AIRSAR -- AIRSAR Polarimetric Format</h1>Most variants of the AIRSAR Polarimetric Format produced by the AIRSARIntegrated Processor are supported for reading by GDAL. AIRSAR productsnormally include various associated data files, but only the imagery data themselves is supported. Normally these are named <i>mission</i>_l.dat(L-Band) or <i>mission</i>_c.dat (C-Band).<p>AIRSAR format contains a polarimetric image in compressed stokes matrix form. Internally GDAL decompresses the data into a stokes matrix, and then convertsthat form into a covariance matrix. The returned six bands are the six valuesneeded to define the 3x3 Hermitian covariance matrix. The convention usedto represent the covariance matrix in terms of the scattering matrixelements HH, HV (=VH), and VV is indicated below. Note that the non-diagonal elements of the matrix are complex values, while the diagonalvalues are real (though represented as complex bands).<p><ul><li> Band 1: Covariance_11 (Float32) = HH*conj(HH)<li> Band 2: Covariance_12 (CFloat32) = sqrt(2)*HH*conj(HV)<li> Band 3: Covariance_13 (CFloat32) = HH*conj(VV)<li> Band 4: Covariance_22 (Float32) = 2*HV*conj(HV)<li> Band 5: Covariance_23 (CFloat32) = sqrt(2)*HV*conj(VV)<li> Band 6: Covariance_33 (Float32) = VV*conj(VV)</ul>The identities of the bands are also reflected in metadata and in the banddescriptions. <p>The AIRSAR product format includes (potentially) several headers of information. This information is captured and represented as metadata on thefile as a whole. Information items from the main header are prefixed with "MH_", items from the parameter header are prefixed with "PH_" andinformation from the calibration header are prefixed with "CH_". The metadata item names are derived automatically from the names of thefields within the header itself. <p>No effort is made to read files associated with the AIRSAR product such as<i>mission</i>_l.mocomp, <i>mission</i>_meta.airsar or <i>mission</i>_meta.podaac.<p>See Also:<p><ul><li> <a href="http://airsar.jpl.nasa.gov/documents/dataformat.htm">AIRSAR Data Format</a></ul></body></html>⌨️ 快捷键说明
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