Panorama Image Sets for Terrestrial Photogrammetric Surveys

Abstract

ABSTRACT:High resolution 3D models produced from photographs acquired with consumer-grade cameras are becoming increasingly common in the fields of geosciences. However, the quality of an image-based 3D model depends on the planning of the photogrammetric surveys. This means that the geometric configuration of the multi-view camera network and the control data have to be designed in accordance with the required accuracy, resolution and completeness. From a practical application point of view, a proper planning (of both photos and control data) of the photogrammetric survey especially for terrestrial acquisition, is not always ensured due to limited accessibility of the target object and the presence of occlusions. To solve these problems, we propose a different image acquisition strategy and we test different geo-referencing scenarios to deal with the practical issues of a terrestrial photogrammetric survey. The proposed photogrammetric survey procedure is based on the acquisition of a sequence of images in panorama mode by rotating the camera on a standard tripod. The offset of the pivot point from the projection center prevents the stitching of these images into a panorama. We demonstrate how to still take advantage of this capturing mode. The geo-referencing investigation consists of testing the use of directly observed coordinates of the camera positions, different ground control point (GCP) configurations, and GCPs with different accuracies, i.e. artificial targets vs. natural features. Images of the test field in a low-slope hill were acquired from the ground using an SLR camera. To validate the photogrammetric results a terrestrial laser scanner survey is used as benchmark.

A 3D urban scene reconstruction enhancement approach based on adaptive viewpoint selection of panoramic videos

“…Several studies have achieved dense reconstruction using panoramic imaging models or panoramic data (Barazzetti et al, 2010;Wahbeh et al, 2016;Zhu et al, 2020). Piermattei et al (2016) conducted a study in which they simulated the panoramic mode by rotating the camera to capture multiview images of the same site. The results of the photogrammetric processing showed that the panoramic images had a more complete and detailed modelling effect than single views.…”

“…Piermattei et al. (2016) conducted a study in which they simulated the panoramic mode by rotating the camera to capture multiview images of the same site. The results of the photogrammetric processing showed that the panoramic images had a more complete and detailed modelling effect than single views.…”

Minor Imbalance of the Lowermost Italian Glacier from 2006 to 2019

“…Moreover, terrestrial and aerial SfM surveys can be combined to overcome the main limits of both techniques [34]. In fact, the terrestrial approach can provide an accurate representation of complex surfaces [35] but its use is limited to small areas and it may poorly represent a homogeneous terrain. On the contrary, aerial surveys (e.g., using Unmanned Aerial Veicles-UAV) can cover wide areas quickly [36], but aerial-derived DEMs are not optimal in cases of steep or vertical terrains [37].…”