A fast and robust interpolation filter for airborne lidar point clouds
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A fast and robust interpolation filter based on finite difference TPS has been proposed in this paper. The proposed method employs discrete cosine transform to efficiently solve the linear system of TPS equations in case of gridded data, and by a pre-defined weight function with respect to simulation residuals to reduce the effect of outliers and misclassified non-ground points on the accuracy of reference ground surface construction. Fifteen groups of benchmark datasets, provided by the International Society for Photogrammetry and Remote Sensing (ISPRS) commission, were employed to compare the performance of the proposed method with that of the multi-resolution hierarchical classification method (MHC). Results indicate that with respect to kappa coefficient and total error, the proposed method is averagely more accurate than MHC. Specifically, the proposed method is 1.03 and 1.32 times as accurate as MHC in terms of kappa coefficient and total errors. More importantly, the proposed method is averagely more than 8 times faster than MHC. In comparison with some recently developed methods, the proposed algorithm also achieves a good performance.Keywords:
Benchmark (surveying)
Interpolation
The technique of photogrammetry has made rapid progress from analog photogrammetry to analytical photogrammetry,finally into Digital Photogrammetric era.This paper researched on the use of JX-4C digital photogrammetric system in actual cases.
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The development, concepts, relationship with other subjects and its influence in the GIS field of digital Photogrammetry far beyond the simple change from analogue photogrammetry to analytical photogrammetry. As a subject of surveying and mapping, it has developed into a new information industry from the traditional photogrammetry, and according to the photogrammetry itself, it has developed into photogrammetry and computer vision. Nowadays the development of digital photogrammetric workstation has become a responsibility connected with both photogrammetry and computer vision. At the same time, it is most closely connected with the establishment of digital earth in the next century. ho its development brings to us both excellent opportunity and the most austere challenge we have never met before.
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A brief description of photogrammetric procedures are made to show how it has been and today is possible to make correction to photogrammetric measurements for the effect of refraction. Then a review of how refractional effects have been calculated is made. Finally some suggestions are made of how to meet the demands for improved accuracy in photogrammetric measurements.
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Structure from Motion
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Both the need for the recording of cultural heritage and the state-of-the-art of photogrammetric techniques and instruments constitute a challenge for the CIPA in the attempt to promote the extended use of photogrammetry for cultural heritage purposes. The use of photogrammetry is no longer a matter of high cost investments, nor is it necessary to have knowledge of sophisticated techniques. Analytical photogrammetry has greatly reduced operating difficulties. Digital photogrammetry is reducing the cost of the equipment and increasing the possibilities of application of photogrammetry in the field of documentation of monuments and other cultural heritage. In our opinion, a more wide-spread use of photogrammetry may be achieved by teaching and promoting its user possibilities among professionals working on cultural heritage preservation. The use of photogrammetric software is not more complicated than the use of CAD software. On the contrary, it is even less complicated. If CAD is used today in most of the offices of architects and other professionals, why can not photogrammetric software based on simple equipment and simple currently existing methods be more widely used? The problem is thus how to promote the idea of the need for the use of photogrammetry and how to teach about the uses of this technique. A more wide-spread use of photogrammetric software will, undoubtedly, promote a reduction in its costs.
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Photogrammetry has evolved from analog photogrammetry into analytic photogrammetry and with the rapid development and abroad application of computer technology; it has further stepped into digital photogrammetry times. This paper points forward that the old production and technical system are still affecting and restricting the development of digital photogrammetry by analyzing and assuming-up of current photogrammetric production and technological system. The paper puts out that the development and introduction of digital photogrammetric system should accord with impersonality and avoid waste.At last antor prospects the development of digitol photogrammetric technolosy.
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Re-measurement of existing, manufactured parts and re-creation of 3D models of these parts brought about the concept of reverse engineering. Reverse engineering has become a frequently applied and utilized concept in processes such as repairing damaged parts, improving used parts, and making new designs based on old parts. One of the main reverse engineering methods widely used by many engineering branches is photogrammetry. Photogrammetry, which includes a wide range of applications from professional cameras to mobile phones, is divided into branches such as terrestrial photogrammetry, aerial photogrammetry and underwater photogrammetry. The basis of all these categories is the concept of making measurements of a part, structure or region and modeling them in 3D, even if they involve different equipment and instruments. In this study, the 3D model of a rear brake disc of a personal passenger car was obtained using mobile photogrammetric methods. In the results section, the applicability of the method was examined in terms of cost, time and accuracy, together with the results of the accuracy analysis. It has been shown that the mobile photogrammetry method can provide easy applicability, low cost and high accuracy of 0.88 mm.
Reverse engineering
3D modeling
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