Assessing the Impact of the Number of GCPS on the Accuracy of Photogrammetric Mapping from UAV Imagery

doi:10.22616/j.balticsurveying.2019.006

Cited by 12 publications

(3 citation statements)

References 19 publications

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“…There are numerous studies in which it has been corroborated that increasing the number of GCPs improves the accuracy of results of UAV photogrammetric projects. For example, [59] needed approximately six to seven GCPs to obtain accuracy of about 15.6 cm, and specified that it was necessary to increase the number of GCPs to reduce error. In [60], a study was conducted to analyze the optimal number of GCPs for volumetric measurements in open pit mines; for accuracies of about 5.0 cm, they concluded that about 15 GCP/km 2 were needed.…”

Section: Image Processingmentioning

confidence: 99%

Use of UAV-Photogrammetry for Quasi-Vertical Wall Surveying

2020

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In this study, an analysis of the capabilities of unmanned aerial vehicle (UAV) photogrammetry to obtain point clouds from areas with a near-vertical inclination was carried out. For this purpose, 18 different combinations were proposed, varying the number of ground control points (GCPs), the adequacy (or not) of the distribution of GCPs, and the orientation of the photographs (nadir and oblique). The results have shown that under certain conditions, the accuracy achieved was similar to those obtained by a terrestrial laser scanner (TLS). For this reason, it is necessary to increase the number of GCPs as much as possible in order to cover a whole study area. In the event that this is not possible, the inclusion of oblique photography ostensibly improves results; therefore, it is always advisable since they also improve the geometric descriptions of break lines or sudden changes in slope. In this sense, UAVs seem to be a more economic substitute compared to TLS for vertical wall surveying.

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Section: Image Processingmentioning

confidence: 99%

Use of UAV-Photogrammetry for Quasi-Vertical Wall Surveying

2020

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“…Characteristics of the repeated UAV campaigns are presented in Table 1. The photogrammetric processing of the UAV data was performed into Agisoft PhotoScan software, while Global Navigation Satellite System (GNSS) measurements were performed onshore utilizing a Leica GS08 GNSS receiver using square checkers in different colors placed throughout the research area and used for the georeferencing of the UAV images [17]. The high-quality option was selected for the alignment of the images, while the processing of the imagery was made using the original image size.…”

Section: Methodsmentioning

confidence: 99%

Synergy of UAV data and in situ measurements for the shoreline mapping in Arkoudi beach, Western Greece

Apostolopoulos¹,

Nikolakopoulos²

2022

Earth Resources and Environmental Remote Sensing/Gis Applications XIII

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Coastal areas are attractive for human populations as they are important areas of business and socio-economic activities. The Prefecture of Western Greece is experiencing population movement from the urban to the coastal areas causing nuisance and changes to the marine environment. These changes need to be assessed systematically in order to build models that can predict the evolution in the future. In addition, except for the man-made infrastructures, natural phenomena such as undulation, wind and coastal currents affect the shape of the beach, the shoreline and the seabed. Remote sensing is an efficient way to measure these changes repeatedly using high resolution satellite data, air photos and airborne Lidar in conjunction with Digital Surface Models (DSMs) and orthophoto maps. These methods have disadvantages as they are high cost, especially in cases where multitemporal data is deeded. Unmanned aerial vehicles (UAV) photogrammetry, offers a reliable alternative solution to the acquisition of high accuracy spatial data along the littoral zone, representing a rapid low-cost tool for coastline monitoring. In the present study, the littoral area of the bay of Arkoudi situated in the Prefecture of Ilia’s, Greece, has been used as test site. Repeated UAV campaigns were performed in 2020, 2021 and 2022 in synergy with extensive Global Navigation Satellite System (GNSS) measurements and bathymetric campaigns. RGB and multispectral UAV data were processed in order to extract the coastline, the topography and the inclination of the beach and to estimate the evolution of the littoral zone of the area.

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“…Global shutters still have the dominance over cheaper rolling shutter solutions. Publications of [24][25][26] describe the impact of GCP measurement accuracy and arrangement on image quality.…”

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confidence: 99%

Polymodal Method of Improving the Quality of Photogrammetric Images and Models

Burdziakowski

2021

Energies

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Photogrammetry using unmanned aerial vehicles has become very popular and is already commonly used. The most frequent photogrammetry products are an orthoimage, digital terrain model and a 3D object model. When executing measurement flights, it may happen that there are unsuitable lighting conditions, and the flight itself is fast and not very stable. As a result, noise and blur appear on the images, and the images themselves can have too low of a resolution to satisfy the quality requirements for a photogrammetric product. In such cases, the obtained images are useless or will significantly reduce the quality of the end-product of low-level photogrammetry. A new polymodal method of improving measurement image quality has been proposed to avoid such issues. The method discussed in this article removes degrading factors from the images and, as a consequence, improves the geometric and interpretative quality of a photogrammetric product. The author analyzed 17 various image degradation cases, developed 34 models based on degraded and recovered images, and conducted an objective analysis of the quality of the recovered images and models. As evidenced, the result was a significant improvement in the interpretative quality of the images themselves and a better geometry model.

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Assessing the Impact of the Number of GCPS on the Accuracy of Photogrammetric Mapping from UAV Imagery

Cited by 12 publications

References 19 publications

Use of UAV-Photogrammetry for Quasi-Vertical Wall Surveying

Use of UAV-Photogrammetry for Quasi-Vertical Wall Surveying

Synergy of UAV data and in situ measurements for the shoreline mapping in Arkoudi beach, Western Greece

Polymodal Method of Improving the Quality of Photogrammetric Images and Models

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