Modern Methodologies for Photogrammetric Point Determination
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摘要: 介绍了现行航空摄影测量加密的三种作业模式及其最基本的数学模型,利用自行研制的高精度航空摄影测量加密系统WuCAPS对带有POS数据的1∶2500~1∶60000各种摄影比例尺的覆盖多种地形的航摄影像实施加密,分析并比较了各种加密方法的加密精度。结果表明,三种加密方法均能满足我国现行航空摄影测量规范对航测生产的精度要求。并对如何选用合适的航空摄影测量加密方法对国家基础测绘、4D产品生产和基础地理信息的快速更新提出了建议。
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关键词:
- 航空摄影测量加密 /
- GPS /
- 定位定姿系统(POS) /
- 精度
Abstract: Three kinds of operational methodologies and their mathematic models of modern aerial photogrammetric point determination are described.A combined bundle block adjustment system WuCAPS,which can make conventional bundle block adjustment,GPS-supported bundle block adjustment and POS-supported bundle block adjustment,is developed based on the basic mathematic models mentioned above.Real aerial photographs,at image scales from 1∶2 500 to 1∶60 000,with POS data taken over various topographies in China were processed by WuCAPS.The accuracies of photogrammetric point determination from three methodologies are compared and analyzed.The empirical results have verified that the coordinate accuracies of the photogrammetric points can meet the requirements of the specifications of topographic mapping.However,it is necessary for topographic mapping to adopt the most economical and the most operational methodology. -
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