Results 51 to 60 of about 13,128,782 (268)

Effect of the sampling design of ground control points on the geometric correction of remotely sensed imagery

, 2012
The acquirement of ground control points (GCPs) is a basic and important step in the geometric correction of remotely sensed imagery. In particular, the spatial distribution of GCPs may affect the accuracy and quality of image correction.
Heuvelink, G.B.M., Ge, Y, Zhou, C., Brus, D.J., Brus, D, Wang, J., Ge, Y., Zhou, CH, Heuvelink, GBM, Wang, JH(王江浩)   +9 more
core   +2 more sources

Assessing the Accuracy of Digital Surface Models Derived from Optical Imagery Acquired with Unmanned Aerial Systems

Drones, 2019
Small unmanned aerial systems (UASs) equipped with an optical camera are a cost-effective strategy for topographic surveys. These low-cost UASs can provide useful information for three-dimensional (3D) reconstruction even if they are equipped with a low ...
Salvatore Manfreda, Petr Dvorak, Jana Mullerova, Sorin Herban, Pietro Vuono, José Juan Arranz Justel, Matthew Perks   +6 more
doaj   +1 more source

Camera Calibration for Coastal Monitoring Using Available Snapshot Images

Remote Sensing, 2020
Joint intrinsic and extrinsic calibration from a single snapshot is a common requirement in coastal monitoring practice. This work analyzes the influence of different aspects, such as the distribution of Ground Control Points (GCPs) or the image ...
Gonzalo Simarro, Daniel Calvete, Paola Souto, Jorge Guillén   +3 more
doaj   +1 more source

HYBRID GEOMETRIC CALIBRATION METHOD FOR MULTI-PLATFORM SPACEBORNE SAR IMAGE WITH SPARSE GCPS [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2018
Geometric calibration is able to provide high-accuracy geometric coordinates of spaceborne SAR image through accurate geometric parameters in the Range-Doppler model by ground control points (GCPs).
G. Lv, G. Lv, X. Tang, B. Ai, T. Li, Q. Chen   +5 more
doaj   +1 more source

A weighted least squares solution for space intersection of spaceborne stereo SAR data [PDF]

, 2001
The use of stereoscopic SAR images offers an alternative to interferometric SAR for the generation of digital elevation models (DEMs). The stereo radargrammetric method is robust and can generate DEMs of sufficient accuracy to geocode SAR images ...
Dowman, I.J., Ian J. Dowman, Pu-huai Chen, Chen, P.-H.   +3 more
core  

Deciphering the Palimpsest: Chronological Uncertainty and the Interpretation of Mining Landscapes at Písečný vrch (Czech Republic)

Archaeological Prospection, EarlyView.
ABSTRACT We investigated the Písečný vrch (Czech Republic), a site exploited for quartz mining in both prehistoric times and the 20th century. Due to their morphological similarity across all mining periods, the differentiation between pits with archaeological potential and recent ones is challenging.
Jan Fišer, Petr Krištuf, Jan Kropáček, Vojtěch Barták, Lenka Starková, Vítězslav Moudrý   +5 more
wiley   +1 more source

Automating Ground Control Point Detection in Drone Imagery: From Computer Vision to Deep Learning

Remote Sensing
Drone-based photogrammetry typically requires the task of georeferencing aerial images by detecting the center of Ground Control Points (GCPs) placed in the field. Since this is a very labor-intensive task, it could benefit greatly from automation.
Gonzalo Muradás Odriozola, Klaas Pauly, Samuel Oswald, Dries Raymaekers   +3 more
doaj   +1 more source

Measurement of surface velocity in open channels using a lightweight remotely piloted aircraft system

Geomatics, Natural Hazards & Risk, 2017
In this paper, a low-cost remotely piloted aircraft system (RPAS) technique is proposed for measurement of the surface velocity in rivers or channels with low surface velocity and small discharge.
M. Bolognesi, G. Farina, S. Alvisi, M. Franchini, A. Pellegrinelli, P. Russo   +5 more
doaj   +1 more source

A Region Growing controlled by Edge Map technique (RGCE) for Automatic Registration of Satellite Images [PDF]

Journal of the ACS Advances in Computer Science, 2019
Image registration is a basic and troublesome assignment where managingremotely sensed satellite images. The registration of different platform images has turnedinto a critical issue with an expanding number of images gathered each day from ...
doaj   +1 more source

Uncertainty Analysis for Image-Based Streamflow Measurement: The Influence of Ground Control Points

, 2022
Large-scale particle image velocimetry (LSPIV) provides a cost-effective, rapid, and secure monitoring tool for streamflow measurements. However, surveys of ground control points (GCPs) might affect the camera parameters through the solution of ...
Wen-Cheng Liu, Chih-Chieh Young, Wei-Che Huang   +2 more
core   +1 more source