Results 31 to 40 of about 273,921 (293)

Precise Georeferencing of RGB and Multispectral Drone Images without Ground Control Points [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Drones equipped with multispectral cameras are increasingly used in environmental studies. These surveys often take place in challenging locations such as mudflats, where marking and surveying ground control points (GCPs) is difficult, making the use of ...
J. A. Gonçalves, J. A. Gonçalves, M. Meyer, M. Meyer, A. Bio   +4 more
doaj   +1 more source

Accuracy of UAV-based DEMs without ground control points

GeoInformatica, 2023
AbstractUnmanned aerial vehicles (UAVs) are increasingly used in various environmental research projects and other activities that require accurate topography images. The quality of elevation models derived from UAV measurements varies depending on many variables (e.g. UAV equipment used, terrain conditions, etc.).
openaire   +1 more source

LiDAR-derived high quality ground control information and DEM for image orthorectification [PDF]

, 2007
Orthophotos (or orthoimages if in digital form) have long been recognised as a supplement or alternative to standard maps. The increasing applications of orthoimages require efforts to ensure the accuracy of produced orthoimages.
Chandra, Shobhit, Liu, Xiaoye, Zhang, Zhenyu, Peterson, Jim   +3 more
core   +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

Learning to Detect Ground Control Points for Improving the Accuracy of Stereo Matching [PDF]

2014 IEEE Conference on Computer Vision and Pattern Recognition, 2014
While machine learning has been instrumental to the ongoing progress in most areas of computer vision, it has not been applied to the problem of stereo matching with similar frequency or success. We present a supervised learning approach for predicting the correctness of stereo matches based on a random forest and a set of features that capture various
Spyropoulos, Aristotle, Komodakis, Nikos, Mordohai, Philippos   +2 more
openaire   +2 more sources

UAV AND LIDAR IMAGE REGISTRATION: A SURF-BASED APPROACH FOR GROUND CONTROL POINTS SELECTION [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2019
Multisource remote sensing image data provides synthesized information to support many applications including land cover mapping, urban planning, water resource management, and GIS modelling.
B. Kalantar, N. Ueda, H. A. H. Al-Najjar, H. Moayedi, H. Moayedi, A. A. Halin, S. Mansor   +6 more
doaj   +1 more source

Automated Ground Control Point Identification using Deep Learning Techniques

VGC 2023 - Unveiling the dynamic Earth with digital methods : 5th Virtual Geoscience Conference ; Book of Abstracts, 2023
Ground Control Points (GCPs) play a crucial role in photogrammetry, providing essential information for georeferencing, registration and scaling of aerial and satellite imagery. These reference points, with known coordinates, are strategically placed and precisely measured on the ground to achieve accurate georeferencing in the photogrammetric process.
Blanch Gorriz, Xabier, Elias, Melanie, Jäschke, Almut, Grothum, Oliver, Grundmann, Jens, Eltner, Anette   +5 more
openaire   +3 more sources

Therapeutic Apheresis in Nigeria: A Multi‐Center Summary of Abstracts From the Inaugural Nigerian Society for Apheresis Scientific Meeting

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Therapeutic apheresis (TA) is an established treatment modality for hematologic, neurologic, and immunologic disorders, yet access remains severely limited in sub‐Saharan Africa. Donor apheresis, including platelet apheresis collection from healthy donors, represents an important complementary modality supporting blood product ...
Nosa Bazuaye, Chimezie Okwuonu, Evelyn Idam, Folasade Adelekan‐Popoola, Shakirat Gold‐Olufadi, Olufunto Olufela Kalejaiye, Abdullateef Ogala, Zinnah Aloziem, Blossom Amamchukwu, Patience Elimia, Mkpoikanabasi Obot‐Obot, Henry Mbakwe, Praises Maduagwuna, Olatunji Akinrodoye, Chiamaka Anyanwu, Benjamin Anyanwu, Adedamola Akinsiku, Oluwatoyin A. Akinsiku, Muzamil O. Hassan, Fatiu A. Arogundade, Olalekan E. Ojo, Homayemem Weli, Jesupelumi Adenihun, Aderemi Adelaja, Ebun Bamgboye, Olalekan Olatise, Ade E. Faponle, Ayoola Odeyemi, Michael Muoka, Stephen Asaolu, Qudrat Busari, Blessing Dawudu, Michael Naiyeju, Rasheed A. Balogun   +33 more
wiley   +1 more source

High-Precision UAV Photogrammetry with RTK GNSS: Eliminating Ground Control Points

Hittite Journal of Science and Engineering
The advancements in Unmanned Aerial Vehicles (UAVs) have significantly enhanced the capability of the photogrammetric approaches, particularly with the integration of Real-Time Kinematic (RTK) sensors.
Mehmet Nurullah Alkan
doaj   +1 more source

Accuracy of 3D Landscape Reconstruction without Ground Control Points Using Different UAS Platforms

Drones, 2020
The rapid increase of low-cost consumer-grade to enterprise-level unmanned aerial systems (UASs) has resulted in the exponential use of these systems in many applications.
Margaret Kalacska, Oliver Lucanus, J. Pablo Arroyo-Mora, Étienne Laliberté, Kathryn Elmer, George Leblanc, Andrew Groves   +6 more
doaj   +1 more source