Method for accurately calculating volume variation of multi-temporal photogrammetry data
A technology of photogrammetry and volume change, applied in the field of surveying and mapping, can solve the problems of inaccurate calculation of object volume change, difficulty in spatial registration of UAV image data, etc., and achieve high measurement accuracy, low cost, and small workload Effect
Active Publication Date: 2020-08-14
武汉大势智慧科技有限公司
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[0006] In order to overcome the above-mentioned shortcomings of the prior art, the present invention proposes an accurate calculation method for the volume change of multi-temporal photogrammetry data, which solves the problem of unmanned aerial vehicle images obtained at different times without the assistance of image control points and high-precision POS The spatial registration of data is difficult, and the technical problem of inaccurate calculation of object volume change
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[0034] The following examples are presented to illustrate certain embodiments of the invention and should not be construed as limiting the scope of the invention. The content disclosed in the present invention can be improved simultaneously from materials, methods and reaction conditions, and all these improvements should fall within the spirit and scope of the present invention.
[0035] Such as figure 1 As shown, for a construction site (covering an area of 0.5km 2 ) data collection before and after the excavation and filling work, and analyze and calculate the volume change during the excavation and filling construction, specifically including the following steps:
[0036] S1: Use drones to collect photogrammetry data before and after filling and excavation work, and obtain drone aerial images and corresponding GPS data;
[0037] Acquiring photogrammetric data includes the following steps:
[0038] S11: Delineate the earthwork measurement boundary according to the cons...
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The invention relates to a method for accurately measuring the volume variation of multi-temporal photogrammetry data. The method specifically comprises the following steps: S1, collecting photogrammetric data of a measured object in multiple periods before and after volume variation of the measured object by using an unmanned aerial vehicle; S2, respectively performing aerial triangulation on aerial images of the unmanned aerial vehicle in multiple periods; S3, performing dense matching on the aerial images of the unmanned aerial vehicle in multiple periods on the basis of respective aerial triangulation results to obtain dense matching point clouds; S4, taking the space where the dense matching point cloud is located in a certain period as a fixed reference space, and converting the registration of the dense matching point cloud in other periods into the fixed reference space; S5, calculating the volume change according to the dense matching point cloud in each period. Spatial registration is performed on the two-stage aerial images of the same position acquired by the unmanned aerial vehicle at different time so that the volume change amount between the two-stage data can be calculated by utilizing the photogrammetry method, a high-precision POS module or a ground image control point is not needed, the workload of operating personnel is small, the measurement precision is high, the cost is low and the efficiency is high.
Description
technical field [0001] The invention relates to the technical field of surveying and mapping, in particular to an accurate calculation method for the volume change of multi-temporal photogrammetry data. Background technique [0002] In urban construction, the calculation of earthwork requires the joint calculation of multi-temporal photogrammetry data obtained in multiple time periods, to obtain the deviation between the surface 3D models, and to calculate the accurate filling and excavation volume. At present, methods such as cross-section method and topographic point surveying and mapping have the problems of heavy workload and inaccurate results. [0003] UAVs combined with photogrammetry or computer vision methods can quickly obtain surface three-dimensional space data, but UAV photogrammetry usually requires accurate spatial references for earth and stone volume calculations, so it is necessary to install precise positioning heights for UAVs. Precision POS module (RTK / ...
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IPC IPC(8): G01B11/00G01B11/24
CPCG01B11/00G01B11/24
Inventor 张帆
Owner 武汉大势智慧科技有限公司