مقایسة مؤلفه‌های پولاریمتریک سار دوپولاریمتریک با سار تمام‌پولاریمتریک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار دانشکدة جغرافیا، دانشگاه تهران

2 استادیار پژوهشگاه هواشناسی و علوم جو

چکیده

در تصاویر سار تمام‌پولاریمتریک، امکان شناسایی و تشخیص اهداف برمبنای خصوصیات پولاریمتریک آن‌ها وجود دارد. بااین‌حال، به‌دلیل پیچیدگی‌های سنجنده، بیشتر سنجنده‌های سار در حالت دوپولاریمتریک فعالیت می‌کنند و فراوانی داده‌های دوپولاریمتریک بسیار بیشتر از داده‌های تمام‌پولاریمتریک است. در این تحقیق، میزان کارآیی مؤلفه‌های پولاریمتریک استخراج‌شده از حالت دوقطبی با حالت تمام‌پولاریمتریک مقایسه شده‌اند. بدین‌منظور، مؤلفه‌های آلفا و انتروپی در سه حالت HH-HV ، HH-VV، HV-VV و تمام‌پولاریمتریک محاسبه شده است. با هدف بررسی دقیق‌تر، مقادیر آلفا و انتروپی به‌تفکیک کلاس‌های پوشش زمین استخراج شده‌اند. مقایسة مقادیر خطای مطلق میانگین بین مقادیر آلفا در حالت تمام‌پولاریمتریک با مقادیر حالت دوپولاریمتریک نشان می‌دهد که بین حالت HH-HV، با حالت تمام‌پولاریمتریک، کمترین خطا وجود دارد و بیشترین خطا به حالت HH-VV متعلق است. میزان خطا بین مقادیر انتروپی حالت تمام‌پولاریمتریک و حالت HH-HV، HH-VV و HV-VV، به‌ترتیب، برابر 06/0 و 22/0 و 17/0 است. بر این اساس، حالت دوپولاریمتریک HH-HV بیشترین انطباق را با حالت تمام‌پولاریمتریک دارد و ترکیب باندهای هم‌قطب HH-VV کمترین انطباق را با حالت تمام‌پولاریمتریک داراست. در بین کلاس‌های متفاوت پوشش اراضی، مقادیر آلفای کلاس آب در حالت HH-HV بیشترین نزدیکی را با حالت تمام‌پولاریمتریک دارد. بین مقادیر انتروپی کلاس‌های متفاوت پوشش زمین در حالت HH-HV با حالت تمام‌پولاریمتریک، اختلاف معناداری وجود ندارد. براساس یافته‌های این تحقیق، نتیجه‌گیری می‌شود که ترکیب HH-HV به حالت تمام‌پولاریمتریک نزدیک‌تر است.

کلیدواژه‌ها

عنوان مقاله [English]

Polarimetric Feature Comparison of Full and Dual Polarimetric SAR

نویسندگان [English]

  • Sara Attarchi 1
  • Mehdi Rahnama 2
1 Assistant prof. of Remote Sensing and GIS Dep., Faculty of Geography, University of Tehran
2 Assistant prof. of Atmospheric Science and Meteorological Research Center
چکیده [English]

Full polarimetric SAR sensors can capture full polarimetric characteristics of targets. Therefore, in comparison with single and dual polarimetric sensors they offer more capabilities in target detection. However, operation in full polarimetric mode increases complexity, data volume and need more power. Full polarimetric sensors acquire images with less swath compared to dual mode. As a result, most of SAR sensors operate in dual mode and provide dual polarimetric images. Due to high availability, dual polarimetric images are increasingly being used in many researches. In this research, the efficiency of dual polarimetric images is compared with full polarimetric mode. The main goal is to find the best combination of two polarimetric bands which has the nearest results to full polarimetric mode.One Advanced Land Observing Satellite / Phased Array L-band Synthetic Aperture Radar scene had been processed. The scene was multi-looked and converted to the backscattering coefficient (sigma nought, dB). The image was decomposed by cluode-pottier method into alpha and entropy components. Three different combination of two polarimetric bands were considered; HH-HV; HH-VV and HV-VV. Alpha and entropy of each dual polarimetric mode were also computed. Then alpha and entropy driven from full-polarimetric mode were separately compared with alpha and entropy of each dual mode. Since different land cover types (i.e. built-up, cropland, bare land and water) exist in the scene, the computations were done separately for each land cover type. The comparison among alpha values from full polarimetric mode and dual polarimetric mode reveals that HH-HV combination shows the best conformity with full polarimetric mode. HH-VV dual mode has the poorest results. Entropy values of HH-HV mode had the least difference with full polarimetric mode. Entropy values of HH-VV shows the weakest similarity. The MAE values of HH-HV, HH-VV and HV-VV were 0.06, 0.22 and 0.17, respectively. The findings of this research shows that polarimetric features driven from HH-HV combination are more compatible with full-polarimetric mode. In case, no full polarimetric image is available, this dual combination can be substituted. Based on quantitative results, HH-HV combination is recommended to be used in case no full polarimetric image is availableOne Advanced Land Observing Satellite / Phased Array L-band Synthetic Aperture Radar scene had been processed. The scene was multi-looked and converted to the backscattering coefficient (sigma nought, dB). The image was decomposed by cluode-pottier method into alpha and entropy components. Three different combination of two polarimetric bands were considered; HH-HV; HH-VV and HV-VV. Alpha and entropy of each dual polarimetric mode were also computed. Then alpha and entropy driven from full-polarimetric mode were separately compared with alpha and entropy of each dual mode. Since different land cover types (i.e. built-up, cropland, bare land and water) exist in the scene, the computations were done separately for each land cover type. The comparison among alpha values from full polarimetric mode and dual polarimetric mode reveals that HH-HV combination shows the best conformity with full polarimetric mode. HH-VV dual mode has the poorest results. Entropy values of HH-HV mode had the least difference with full polarimetric mode. Entropy values of HH-VV shows the weakest similarity. The MAE values of HH-HV, HH-VV and HV-VV were 0.06, 0.22 and 0.17, respectively. The findings of this research shows that polarimetric features driven from HH-HV combination are more compatible with full-polarimetric mode. In case, no full polarimetric image is available, this dual combination can be substituted. Based on quantitative results, HH-HV combination is recommended to be used in case no full polarimetric image is available.

کلیدواژه‌ها [English]

  • Full polarimetric SAR
  • Dual polarimetric SAR
  • Alpha
  • Entropy
  • Mean absolute error

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نشریه سنجش از دور و GIS ایران
دوره 12، شماره 1 - شماره پیاپی 45
اردیبهشت 1399
صفحه 87-100

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