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32 lines
5.7 KiB
HTML
32 lines
5.7 KiB
HTML
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</head><body><h1>SARPolarSynth</h1><h2>Brief Description</h2>Gives, for each pixel, the power that would have been received by a SAR system with a basis different from the classical (H,V) one (polarimetric synthetis).<h2>Tags</h2>SAR<h2>Long Description</h2>This application gives, for each pixel, the power that would have been received by a SAR system with a basis different from the classical (H,V) one (polarimetric synthetis).
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The new basis A and B are indicated through two Jones vectors, defined by the user thanks to orientation (psi) and ellipticity (khi) parameters.
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These parameters are namely psii, khii, psir and khir. The suffixes (i) and (r) refer to the transmiting antenna and the receiving antenna respectively.
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Orientations and ellipticities are given in degrees, and are between -90°/90° and -45°/45° respectively.
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Four polarization architectures can be processed :
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1) HH_HV_VH_VV : full polarization, general bistatic case.
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2) HH_HV_VV or HH_VH_VV : full polarization, monostatic case (transmitter and receiver are co-located).
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3) HH_HV : dual polarization.
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4) VH_VV : dual polarization.
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The application takes a complex vector image as input, where each band correspond to a particular emission/reception polarization scheme.
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User must comply with the band order given above, since the bands are used to build the Sinclair matrix.
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In order to determine the architecture, the application first relies on the number of bands of the input image.
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1) Architecture HH_HV_VH_VV is the only one with four bands, there is no possible confusion.
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2) Concerning HH_HV_VV and HH_VH_VV architectures, both correspond to a three channels image. But they are processed in the same way, as the Sinclair matrix is symetric in the monostatic case.
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3) Finally, the two last architectures (dual polarizations), can't be distinguished only by the number of bands of the input image.
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User must then use the parameters emissionh and emissionv to indicate the architecture of the system : emissionh=1 and emissionv=0 --> HH_HV, emissionh=0 and emissionv=1 --> VH_VV.
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Note : if the architecture is HH_HV, khii and psii are automatically set to 0°/0°; if the architecture is VH_VV, khii and psii are automatically set to 0°/90°.
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It is also possible to force the calculation to co-polar or cross-polar modes.
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In the co-polar case, values for psir and khir will be ignored and forced to psii and khii; same as the cross-polar mode, where khir and psir will be forced to psii+90° and -khii.
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Finally, the result of the polarimetric synthetis is expressed in the power domain, through a one-band scalar image.
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Note: this application doesn't take into account the terms which do not depend on the polarization of the antennas.
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The parameter gain can be used for this purpose.
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More details can be found in the OTB CookBook (SAR processing chapter).<h2>Parameters</h2><ul><li><b>[param] -in</b> <string> Input image.. Mandatory: True. Default Value: ""</li><li><b>[param] -out</b> <string> Output image.. Mandatory: True. Default Value: ""</li><li><b>[param] -psii</b> <float> Orientation (transmitting antenna). Mandatory: True. Default Value: "0"</li><li><b>[param] -khii</b> <float> Ellipticity (transmitting antenna). Mandatory: True. Default Value: "0"</li><li><b>[param] -psir</b> <float> Orientation (receiving antenna). Mandatory: True. Default Value: "0"</li><li><b>[param] -khir</b> <float> Ellipticity (receiving antenna). Mandatory: True. Default Value: "0"</li><li><b>[param] -emissionh</b> <int32> This parameter is useful in determining the polarization architecture (dual polarization case).. Mandatory: False. Default Value: "0"</li><li><b>[param] -emissionv</b> <int32> This parameter is useful in determining the polarization architecture (dual polarization case).. Mandatory: False. Default Value: "0"</li><li><b>[param] -ram</b> <int32> Available memory for processing (in MB). Mandatory: False. Default Value: "128"</li><li><b>[param] -inxml</b> <string> Load otb application from xml file. Mandatory: False. Default Value: ""</li><li><b>[param] -outxml</b> <string> Save otb application to xml file. Mandatory: False. Default Value: ""</li><b>[choice] -mode</b> none,co,cross. Mandatory: True. Default Value: "none"<ul><li><b>[group] -none</b></li><ul></ul><li><b>[group] -co</b></li><ul></ul><li><b>[group] -cross</b></li><ul></ul></ul></ul><h2>Limitations</h2>None<h2>Authors</h2>OTB-Team<h2>See Also</h2>SARDecompositions, SARPolarMatrixConvert<h2>Example of use</h2><ul><li><p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">in: sar.tif</p></li><li><p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">psii: 15.</p></li><li><p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">khii: 5.</p></li><li><p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">psir: -25.</p></li><li><p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">khir: 10.</p></li><li><p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">out: newbasis.tif</p></li></ul></body></html> |