CADASTRAL PLAN GEOMETRIC ACCURACY IMPROVEMENT

2010 ◽  
Author(s):  
Branka Vorel
Keyword(s):  
Geometric Accuracy ◽  
Accuracy Improvement

Satellite-Imagery Geometric Accuracy Improvement Based on Direct Correction of Dominant Coefficients

2020 ◽  
Vol 86 (4) ◽  
pp. 215-224
Author(s):  
Xinming Tang ◽  
Changru Liu ◽  
Ping Zhou ◽  
Ning Cao ◽  
FengXiang Li ◽  
...  
Keyword(s):  
Satellite Imagery ◽  
Satellite Images ◽  
Geometric Accuracy ◽  
Accuracy Improvement ◽  
First Order ◽  
Polynomial Coefficients ◽  
Sensor Model ◽  
Rational Polynomial ◽  
Refinement Method ◽  
Correlation Problem

An important and difficult point in the application of satellite imagery is refining the positioning model and improving the geometric accuracy. In this study, we focus on improvement in geometric accuracy and develop a new rational function model (<small>RFM</small>) refinement method. First, we derive the conversion relationship between the rigorous sensor model and the <small>RFM</small>, based on which we illustrate the approximate meaning of the zero-order and first-order terms of the rational polynomial coefficients (<small>RPCs</small>). Second, the correlation problem between <small>RPCs</small> and the influence of individual <small>RPCs</small> on geometric positioning accuracy are analyzed and verified. The dominant coefficients that determine geolocation are then identified. Finally, a new <small>RFM</small> refinement method based on direct correction of the dominant coefficients is proposed and validated. The experiments, conducted with <small>ZY3-02</small> satellite imagery, indicate that the proposed method can effectively improve the geometric accuracy of satellite images.

Geometric accuracy improvement of WorldView‐2 imagery using freely available DEM data

2019 ◽  
Vol 34 (167) ◽  
pp. 266-281 ◽  
Author(s):  
Mateo Gašparović ◽  
Dino Dobrinić ◽  
Damir Medak
Keyword(s):  
Geometric Accuracy ◽  
Accuracy Improvement

Model predictive control of incremental sheet forming for geometric accuracy improvement

2015 ◽  
Vol 82 (9-12) ◽  
pp. 1781-1794 ◽  
Author(s):  
Haibo Lu ◽  
Michael Kearney ◽  
Yanle Li ◽  
Sheng Liu ◽  
William J. T. Daniel ◽  
...  
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Geometric Accuracy ◽  
Accuracy Improvement

Geometric accuracy design and error compensation of a one-translational and three-rotational parallel mechanism with articulated traveling plate

2017 ◽  
Vol 232 (12) ◽  
pp. 2083-2097 ◽  
Author(s):  
Tao Sun ◽  
Panfeng Wang ◽  
Binbin Lian ◽  
Sida Liu ◽  
Yapu Zhai
Keyword(s):  
Error Compensation ◽  
Parallel Mechanism ◽  
Screw Theory ◽  
Geometric Error ◽  
Error Modeling ◽  
Geometric Errors ◽  
Kinematic Calibration ◽  
Geometric Accuracy ◽  
Improvement Strategy ◽  
Accuracy Improvement

The demands for advanced and flexible docking equipment are increasing in the fields of aerospace, shipbuilding and construction machinery. Position and orientation accuracy is one of the most important criteria, which would directly affect the docking quality. Taking a novel one-translational and three-rotational docking equipment, referred to as PaQuad parallel mechanism as example, this article proposed an accuracy improvement strategy by geometric accuracy design and error compensation. Drawing mainly on screw theory, geometric error modeling of PaQuad parallel mechanism was first carried out via four independent routes. Joint perturbations and geometric errors were included in each route error twist. Wrenches due to articulated traveling plate were applied to eliminate joint perturbations. Then, geometric accuracy design was implemented at component and substructure levels. The basic principle was to transfer geometric errors into dimensional or geometric tolerance. High-precision machining/assembling techniques were applied to satisfy the tolerance. Finally, error compensation resorting to kinematic calibration was implemented at mechanism level. It can be summarized as identification modeling, measurement planning, and parameter identification and modification. Maximum deviations of PaQuad parallel mechanism before calibration experiment were 0.01 mm, [Formula: see text], [Formula: see text], and [Formula: see text]. And they become 0.01 mm, [Formula: see text], [Formula: see text], and [Formula: see text] after kinematic calibration. Orientation accuracy of PaQuad parallel mechanism has improved one order of magnitude. It proves the effectiveness of accuracy improvement in terms of geometric accuracy design and error compensation.

Accuracy Improvement of Terminal Voltage Self-coupled Laser Distance Sensor

2020 ◽  
Vol 140 (11) ◽  
pp. 1264-1269
Author(s):  
Tatsuya Ohba ◽  
Daisuke Mizushima ◽  
Keishiro Goshima ◽  
Norio Tsuda ◽  
Jun Yamada
Keyword(s):  
Accuracy Improvement ◽  
Terminal Voltage ◽  
Laser Distance Sensor ◽  
Distance Sensor
Sign in / Sign up

Export Citation Format

Share Document