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IGARSS2011 OnTheUseOfPO.ppt
1. On The Use of Polarimetric Orientation for POLSAR Classification and Decomposition Hiroshi Kimura Gifu University, Japan IGARSS 2011 Vancouver, Canada July 25, 2011
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3. Background Ｉ IGARSS 2011, Vancouver, Canada Freeman&Durden decomposition of ALOS PALSAR data (Descend.) Double-bounce , Volume , Surface From map “Isezaki” by The Geospatial Information Authority of Japan (GSI) Agricultural field Built-up Area Objective: To discriminate built-up and non-built-up areas
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6. Ｉ IGARSS 2011, Vancouver, Canada In case of SMALL threshold c (OR) ASCENDING DESCENDING DETECTABLE zone of built-up areas • NO undetectable zone of built-up area • COMMISSION error (Non-built-up areas are assigned to built-up areas) increases. • OMSSION error (Built-up areas are assigned to non-built-up areas) decreases. UNDETECTABLE DETECTABLE
7. Ｉ IGARSS 2011, Vancouver, Canada In case of LARGE threshold c (OR) ASCENDING DESCENDING DETECTABLE zone of built-up areas UNDETECTABLE zone • Undetectable zone of built-up area exists. • COMMISSION error (Non-built-up areas are assigned to built-up areas) decreases. • OMSSION error (Built-up areas are assigned to non-built-up areas) increases. UNDETECTABLE DETECTABLE
8. ALOS PALSAR Experiment: PALSAR Scenes Ｉ IGARSS 2011, Vancouver, Canada The Atsugi area: about 50 km south-west from Tokyo Radar illumination azimuth: 99 (Ascending) 261 (Descending) Expected c is 9 (No undetectable zone and the max. c ), then the PO angle threshold c will be 10 .
9. ALOS PALSAR Experiment: Images Ｉ IGARSS 2011, Vancouver, Canada Pauli color code Freeman&Durden decomposition PO angle |HH-VV| , |HV| , |HH+VV| Double-bounce , Volume , Surface
17. Discrimination Results Ｉ IGARSS 2011, Vancouver, Canada Freeman&Durden decomposition of ALOS PALSAR data ( Descend. ) Double-bounce , Volume , Surface Built-up Areas (white) and non-built-up areas (black) by c =10 ( c =9 ). Agricultural field Built-up Area
18. Discrimination Results Ｉ IGARSS 2011, Vancouver, Canada Freeman&Durden decomposition of ALOS PALSAR data ( Ascend. ) Double-bounce , Volume , Surface Built-up Areas (white) and non-built-up areas (black) by c =10 ( c =9 ). Agricultural field Built-up Area
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20. Rotation of Coherence Matrix (Yamaguchi) Ｉ IGARSS 2011, Vancouver, Canada BEFORE Rotation AFTER Rotation Agricultural fields Built-up Areas |HH-VV| |HV| |HH+VV| Ascending Descending |HH-VV| |HV| |HH+VV| Ascending Descending
21. PO Angle Shifts of Slopes Ｉ IGARSS 2011, Vancouver, Canada Range Slope Angle (degrees)
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