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Register a new userA developed version for error's equation of horizontal direction measurement
صيغة مطورة لمعادلة خطأ قياس الإتجاه الأفقي
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Tishreen University ورقة بحثية
Publication date
2015
fields
topography
and research's language is
العربية
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Shamra Editor
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مع التطور الكبير الحاصل في مجال الأجهزة المساحية، و ظهور أجيال مختلفة و متنوعة الدقة من أجهزة التيودوليت المستخدمة في قياس الإتجاهات و الزوايا الأفقية، أصبحت الحاجة ملحة لتحديث طرق تقييم و تحديد دقة القياسات المنفذة بهذه الأجهزة. و يتحقق هذا من خلال الأخذ بالإعتبار جميع العوامل الداخلية و الخارجية المؤثرة على نظام القياس، في هذا السياق قام فريق العمل بدراسة معادلة الخطأ المشهورة لقياس الإتجاهات الأفقية بالتيودوليت ( معادلة كولكورد ) و اختبارها باستعمال عدد من الأجهزة و الإشارات المساحية و ضمن قاعدة قياس خطية مكونة من خمسة أجزاء و بطول ( 250 m)، و خلص إلى ضرورة صياغة معادلة مطورة تأخذ بالإعتبار العوامل الداخلة أساساّ في معادلة كولكورد ( خطأ التمركز، خطأ التسديد، خطأ القراءة ) بالإضافة إلى نوعية الإشارة المرصودة و طول خط الرصد. تم اختبار هذه المعادلة عملياّ، فأثبت ذلك كفاءة جيدة في الوصول إلى قيم قريبة من القيم الفعلية لأخطاء القياس، و بذلك يمكن اعتمادها في تقدير قيم الأخطاء المتوسطة للإتجاهات الأفقية.
With substantial development in the field of surveying instruments, and the emergence of various and different generations of Theodolites which are used to measure horizontal directions and angles, it is urgent to develop the methods of assessing and determining the accuracy of measurements using these instruments. This is achieved by taking into consideration all the internal and external factors affecting the measurement system. The research team studied the famous error equation (Colcord equation) of horizontal directions and tested it using a several equipments of theodolites and targets on a 250 m long, 5-sections base-line. The team concluded that there was a need to develop Colcord equation by taking into consideration the factors involved mainly by Colcord equation (positioning error, initial sitting error, reading error) in addition to the type of target and the distance of the line of-sight. The proposed equation was tested in practice, which proved that expected errors of measurements were close to their actual values. This could be adopted to estimate the root mean square error (r. m. s. e.) of measurements of horizontal directions.
References used
Kissum,P. Surveying for Civil Engineers ,2nd ed. New York : McGraw Hill Book Company 1981
(Benton ,A. and Taetz , P. J. Elements of Plane Surveying . 1st ed.. New York : McGraw Hill Book Company ( 1991
Colcord , J.E. ( Error Analisys in Angulation Design ) . Proceeding of American Congress on Surveying and Mapping . San Francisco . 1971
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other scientific real-time applications fields.
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