LiDAR data'cloud control 'aerial image photogrammetry method
A technology of aerial imagery and photogrammetry, applied in the high-precision geometric registration of images and LiDAR point clouds, and in the field of LiDAR data "cloud control" aerial imagery photogrammetry, which can solve the problem of relying on field control points and the uneven level of automation of 3D geographic information. Advanced problems, achieve the effect of getting rid of dependence, improving plane accuracy and elevation accuracy, and improving processing efficiency
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[0034] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.
[0035] The technical solution provided by the invention is to use the existing high-precision LiDAR point cloud as the control, and perform joint rigid registration and non-rigid optimization with the sparse point cloud generated by aerial triangulation of aerial images, so as to realize aerial images without field control points High precision orientation. Such as figure 1 As shown, its core process includes the following steps:
[0036] Step 1. Based on 1450 oblique aerial images with a ground resolution of 5cm (including 291 down-looking images) taken in the survey area, use the aerial triangulation results of DPGrid software (including camera parameters, image orientation parameters and sparse feature point cloud). And reconstruct the 3D feature line according to the image feature line matching ...
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