نوع مقاله : علمی - پژوهشی

نویسندگان

1 استادیار گروه عمران دانشکدة مهندسی، دانشگاه بوعلی سینا، همدان

2 استاد گروه فتوگرامتری و سنجش از دور، دانشگاه صنعتی خواجه نصیرالدین طوسی

3 دانشیار گروه فتوگرامتری و سنجش از دور، دانشگاه صنعتی خواجه نصیرالدین طوسی

چکیده

یخچال­های طبیعی و تغییرات و حرکت آنها در جایگاه شاخص­هایی برای نشان‌دادن تغییرات آب‌و‌هوایی به‌کار می‌روند و به‌منظور ارزیابی تغییرات سطحی یخچال ناشی از تغییرات اقلیمی، باید مطالعات بلندمدت انجام شود. استفاده از تصاویر ماهواره‌ای راهی مؤثر برای استخراج سرعت حرکت یخچال محسوب می‌شود. در این تحقیق با استفاده از عکس‌های هوایی قدیمی و تصاویر ماهواره‌ای جدید، تغییرات سطحی و بردارهای جابه‌جایی و سرعت یخچال علم‌چال، با استفاده از الگوریتم خودکار، محاسبه شده است. تمامی داده‌ها، شامل عکس‌های هوایی و تصاویر، به‌صورت ارتو[1] درآمدند و از نظر رادیومتریکی و هندسی همسان‌سازی شدند. با استفاده از عکس هوایی سال 1955 و مقایسة آن با تصویر SPOT سال 2003، میزان عقب‌نشینی یخچال در قسمت پیشانی آن به‌دست آمد. همچنین، تغییرات کوتاه‌مدت در دو بازة زمانی بین 1998 تا 2003 و 2003 تا 2005، با استفاده از عکس‌های هوایی و تصاویرSPOT  و Quick Bird، استخراج شد. در این تحقیق، با استفاده از روش مبتنی‌بر تبدیل فوریه و محاسبة همبستگی، بردار‌های سرعت سطحی با خطای کمتر از دو متر استخراج شد. نتایج دقت و قابلیت روش پیشنهادی را برای ارزیابی میزان عقب‌نشینی و نیز اندازه‌گیری سرعت سطحی یخچال نشان‌ می‌دهند و می‌توان این نتایج را به‌منظور مطالعات مربوط به تغییرات اقلیمی در سطح منطقه‌ای به‌کار برد.

کلیدواژه‌ها

عنوان مقاله [English]

Measurement of Surface Changes and Velocity fields of Alam-chal Glacier Using Satellite Imagery and Aerialphotos

نویسندگان [English]

  • , Y Rezaei 1
  • , M.J. Valadan Zouj 2
  • , M.R Sahebi 3

1 Assistant Prof., Dep. Of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University

2 Prof. of Photogrammetry and Remote Sensing Department, Geodesy and Geomatics Faculty, K.N. Toosi University of Technology

3 Associate prof., Dep. of Photogrammetry and Remote Sensing, Geodesy and Geomatics Faculty, K.N. Toosi University of Technology

چکیده [English]

Mountain Glaciers are pertinent indicators of climate change and their surface velocity changes, are an essential climate variable. In order to retrieve the climatic signature from surface velocity, large scale study of glacier changes is required. Satellite remote sensing is an effective way to derive mountain glacier surface velocities. In this research, we have conducted a comprehensive assessment of Alam-Chal glacier surface changes (include displacement and velocity), all based on remotely-sensed data. All datasets include aerial photos and satellite images were ortho rectified, normalized and co-registered. By using an aerial photograph collected in 1955 as a baseline and comparing it against a 2003 image collected by the SPOT satellite, the glacier retreat, in direct response to changes in local climate conditions were extracted. Furthermore, we have assessed short-term changes over two-time scales (1988-2003, 2003-2005),using an aerial photo acquired in 1988, a 2003 SPOT image, and a high-resolution Quick Bird image collected over the study area in 2005. We have derived accurate glacier surface velocity vectors (RMSE~2m), based on an FFT-based image cross-correlation technique. Our results point to the capability of the proposed method in accurately retrieving glacier surface changes at a high level of spatial detail, which is important for studies of regional climate change.

کلیدواژه‌ها [English]

  • Glacier
  • Aerial photo
  • High resolution satellite images
  • spatial correlation
  • Fourier transform
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