基于二次多项式拟合法的地形图高程精度提高技术
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摘要
针对航测1∶1 000地形图高程精度满足不了要求,试验采用二次多项式拟合方法提高精度。结合新疆喀什地区低空航测项目,着重介绍试验区概况、航高问题分析、方法试验研究、试验结果对比分析等内容。通过3个测区的分析对比得出航高与像控点分布均影响高程精度,采用二次多项式拟合来提高其精度,比以往空中三角测量内业方法改善精度更具有优势。试验表明,利用此方法可以提高高程精度,为地形图高程精度的提高提供了参考和借鉴。
Aiming at the problem that the elevation accuracy of the 1∶1 000 topographic maps cannot meet the requirement,this paper meets the precision requirement by using the method of quadratic polynomials elevation curve fitting.Combined with a low-altitude photogrammetric project in the Kashi region of Xinjiang,it mainly introduces the general situation of the test area,analysis of the flight height problem,experimental study of the methods,comparative analysis of test results,etc.Compared with the analysis of the three test zones,it can obtain that the height accuracy is influenced by the flight height and the distribution of the control point,and so the above mentioned methods are used to improve the accuracy.It is more advantageous than the previous method of aerial triangulation in changing the accuracy.The experiment shows that the method can improve the elevation accuracy,which provides a reference for improving the elevation accuracy of topographic maps.
Aiming at the problem that the elevation accuracy of the 1∶1 000 topographic maps cannot meet the requirement,this paper meets the precision requirement by using the method of quadratic polynomials elevation curve fitting.Combined with a low-altitude photogrammetric project in the Kashi region of Xinjiang,it mainly introduces the general situation of the test area,analysis of the flight height problem,experimental study of the methods,comparative analysis of test results,etc.Compared with the analysis of the three test zones,it can obtain that the height accuracy is influenced by the flight height and the distribution of the control point,and so the above mentioned methods are used to improve the accuracy.It is more advantageous than the previous method of aerial triangulation in changing the accuracy.The experiment shows that the method can improve the elevation accuracy,which provides a reference for improving the elevation accuracy of topographic maps.
引文
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[15]朱昌彦,徐立猛.GPS高程拟合在汾河测绘项目中的应用研究[J].科技信息,2009(17):379-381.
[2]沈方雄,刘祥发,刘幼华,等.影响航测高程精度的关键因素分析与探讨[J].人民长江,2014,45(16):60-62,72.
[3]袁修孝,高宇,邹小容.GPS辅助空中三角测量在低空航测大比例尺地形测图中的应用[J].武汉大学学报(信息科学版),2012,37(11):1289-1293.
[4]张坤鹏,于广瑞,顾广杰.利用差分GNSS获取高精度无人机影像外方位线元素[J].测绘工程,2017,26(7):5-11.
[5]陈良浩,朱彩英,徐青,等.无人机航测水域控制点布设方案的精度试验[J].2016,41(7):205-210.
[6]谢建春,潘宝玉,苏国中,等.一种提高大比例尺航测精度的方法试验研究[J].测绘科学,2013,38(5):5-7,21.
[7]贺永成,王文飞.多项式拟合GPS水准高程软件设计与实现[J].矿山测量,2016,44(4):35-38.
[8]杨伯钢,李兵,李雷.无人机技术在新疆和田大面积地形图测绘中的应用[J].测绘通报,2012(8):21-23.
[9]国家测绘局.低空数字航空摄影规范:CH/Z 3005-2010[S/OL].北京:测绘出版社,2010:6-7[2017-8-7].http://doc.mbalib.com/view/8483d1b1acb40eef51a06f984f4d3774.html.
[10]国家测绘局.低空数字航空摄影测量内业规范:CH/Z3003-2010[S/OL].北京:测绘出版社,2010:2-5[2017-8-7].http://www.docin.com/p-242146222.html.
[11]朱进,丁亚洲,牛科科,等.无人机航测中飞前布控与飞后布控的比较与分析[J].科学技术与工程,2015,15(34):128-132.
[12]孙志鹏,王文龙.最小二乘拟合在井架变形监测中的应用[J].地理空间信息,2012,10(4):147-148,183.
[13]林晏,梁鑫华.区域似大地水准面模型的建立方法分析[J].交通科技与经济,2009,11(4):105-107.
[14]秦修功,陈曦,杨辽,等.构架航线对无人机影像区域网平差精度影响分析[J].测绘科学,2017,42(1):150-157,163.
[15]朱昌彦,徐立猛.GPS高程拟合在汾河测绘项目中的应用研究[J].科技信息,2009(17):379-381.