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The effect of positional precision of control points on the quality of geometric correction of high spatial resolution satellite images

تأثير الدقة المكانية لنقاط الضبط على نوعية التصحيح الهندسي للمرئيات الفضائية ذات الدقة المكانية العالية

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 Publication date 2018
  fields topography
and research's language is العربية
 Created by Shamra Editor




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This study aims is to analyze the effect of spatial accuracy of the control points on the images geometric correction accuracy, and this is done by applying tests on the same image (IKONOS), where polynomial transformations were applied using sets of control points, each with absolute accuracy different from the other. These points were extrapolated from a 1/1000 topographic map and from a georeferenced MOMS satellite image with geometric accuracy of 2m and measured by GPS. The study showed that it is possible to obtain the most accurate geometric correction by using control points with absolute accuracy close to the spatial resolution of the image. It also showed that the use of more precise control points would not ameliorate the accuracy of the geometric correction, because the measurement of these points on the image is limited by its spatial resolution.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة تأثير الدقة المكانية لنقاط الضبط على نوعية التصحيح الهندسي للمرئيات الفضائية ذات الدقة المكانية العالية. يتم استخدام الجيل الجديد من المستشعرات المحمولة على الأقمار الصناعية لتوفير مرئيات فضائية ذات دقة تمييز مكانية عالية لإنتاج الخرائط بمقاييس كبيرة. قبل استخدام هذه المرئيات، يجب تصحيحها هندسياً، وهي عملية تتأثر بأخطاء تتعلق بطبيعة البيانات الأصلية وأخرى ناتجة عن عملية المعالجة. تهدف الدراسة إلى تحليل تأثير الدقة المكانية لنقاط الضبط على الدقة الهندسية للتصحيح، حيث تم إجراء اختبارات على مرئية IKONOS باستخدام مجموعات من نقاط الضبط ذات دقة مطلقة مختلفة. أظهرت النتائج أن استخدام نقاط ضبط بدقة مكانية قريبة من دقة تمييز المرئية يؤدي إلى الحصول على أدق تصحيح هندسي، بينما استخدام نقاط ضبط أكثر دقة لا يحسن من الدقة الهندسية للتصحيح بسبب مشكلة وضوح النقاط على المرئية. تم استخدام نقاط الضبط المستخرجة من مخطط طبوغرافي ومرئية فضائية من نوع MOMS، وأظهرت النتائج أن الدقة الهندسية للتصحيح لا يمكن أن تكون أقل من دقة تمييز المرئية المستخدمة.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة في مجال التصحيح الهندسي للمرئيات الفضائية، حيث تقدم تحليلاً شاملاً لتأثير الدقة المكانية لنقاط الضبط على نوعية التصحيح. ومع ذلك، يمكن الإشارة إلى بعض النقاط التي قد تحتاج إلى مزيد من التوضيح أو التحسين. أولاً، قد يكون من المفيد توضيح المزيد حول كيفية اختيار نقاط الضبط وتوزيعها على المرئية، حيث أن هذا العامل يمكن أن يؤثر بشكل كبير على نتائج التصحيح. ثانياً، قد يكون من المفيد تضمين تحليل أكثر تفصيلاً حول تأثير العوامل البيئية مثل التضاريس والارتفاعات على دقة التصحيح. أخيراً، يمكن أن تكون الدراسة أكثر شمولية إذا تم اختبار تأثير الدقة المكانية لنقاط الضبط على أنواع أخرى من المرئيات الفضائية وليس فقط مرئية IKONOS.
Questions related to the research
  1. ما هو الهدف الرئيسي من هذه الدراسة؟

    الهدف الرئيسي هو تحليل تأثير الدقة المكانية لنقاط الضبط على الدقة الهندسية لتصحيح المرئيات الفضائية ذات الدقة المكانية العالية.

  2. ما هي النتائج الرئيسية التي توصلت إليها الدراسة؟

    النتائج الرئيسية هي أن استخدام نقاط ضبط بدقة مكانية قريبة من دقة تمييز المرئية يؤدي إلى الحصول على أدق تصحيح هندسي، بينما استخدام نقاط ضبط أكثر دقة لا يحسن من الدقة الهندسية للتصحيح.

  3. ما هي المرئية الفضائية التي تم استخدامها في الاختبارات؟

    تم استخدام مرئية IKONOS في الاختبارات.

  4. ما هي التوصيات التي توصلت إليها الدراسة؟

    توصي الدراسة بتوفير نقاط ضبط ذات دقة مكانية قريبة من دقة تمييز المرئية المستخدمة، وضمان توزيع جيد وعدد كافٍ من نقاط الضبط لاستخدامها في التصحيح الهندسي.


References used
RIDLEY، H.، ATKINSON، P.، ALPIN، P.، MULLER، J-P and DOWMAN، I. 1997. Evaluating the potential of the forthcoming commercial U.S high-resolution satellite sensor imagery at the ordnance survey(r). Photogrammetry & Remote Sensing. Vol63، n8، p.997- 1005. 1997
RONGXING، L. 1998. Potential of high-resolution satellite sensor imagery for national mapping products. Photogrammetric Engineering and Remote Sensing. Vol64، n12، p.1165-1169. 1998
D. T. PAI.، 2010. Auto rectification for robotic helicopter aerial imaging. Thesis Master of Sci-ence in Computer Science، San Diego State University، 2010
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