Results 171 to 180 of about 1,854 (193)

Accurate direct georeferencing of aerial imagery in national coordinates

ISPRS Journal of Photogrammetry and Remote Sensing, 2015
In aerial photogrammetry, data products are commonly needed in national coordinates, and, in practice, the georeferencing is often performed in the required national map projection frame directly. However, as a map projection frame is not Cartesian, some additional corrections are necessary in the georeferencing process to take account of various map ...
Yongjun Zhang, Xiang Shen, Qingquan Li   +2 more
exaly   +2 more sources

Direct Georeferencing of Ultrahigh-Resolution UAV Imagery

IEEE Transactions on Geoscience and Remote Sensing, 2014
Micro-unmanned aerial vehicles often collect a large amount of images when mapping an area at an ultrahigh resolution. A direct georeferencing technique potentially eliminates the need for ground control points. In this paper, we developed a camera-global positioning system (GPS) module to allow the synchronization of camera exposure with the airframe ...
Darren Turner, Arko Lucieer, Luke Wallace   +2 more
openaire   +1 more source

A Comparison of Direct Georeferencing and GPS-supported AT

2006 IEEE International Symposium on Geoscience and Remote Sensing, 2006
One of the major tasks in the evaluation process of photogrammetry is the determination of the exterior orientation. Direct Georeferencing (DG) and GPS-supported AT provide new methods for this task in addition to conventional AT. A test flight was performed with two methods DG and GPS supported AT.
D. Guo, L. Wu, Q. Li, J. Wang, X. Zheng
openaire   +1 more source

Resection method for direct georeferencing in Terrestrial Laser Scanner

Journal of Mining and Earth Sciences, 2022
Recently, the direct georeferencing method has been increasingly used in Terrestrial Laser Scanner (TLS). This method has the benefit of saving time, but the low accuracy is a great difficulty to use. This paper proposed a possible approach for direct georeferencing with high accuracy using the resection method.
Dung Trung Pham, Anh Tuan Nhu Nguyen, Cuong Xuan Cao, Tinh Duc Le, Canh Van Le, Cuong Sy Ngo   +5 more
openaire   +1 more source

A precise direct georeferencing system for UAVs

2014
A georeferencing of the collected data is required for many unmanned aerial vehicle (UAV)-based remote sensing applications in the fields of surveying, precision farming, infrastructure inspection or geography. This georeferencing can generally be done indirectly using ground control points, or directly using an on-board sensor system.
Eling, Christian, Klingbeil, Lasse, Kuhlmann, Heiner   +2 more
openaire   +1 more source

Impact of vertical deflection on direct georeferencing of airborne images

Survey Review, 2014
This paper is aimed at analysing the influence of the vertical deflection (DOV) in direct georeferencing (DG) of image data from an aerial digital frame camera. Without considering the value of the DOV, a systematic error is involved in the determination of the point position.
PEPE, MASSIMILIANO, PREZIOSO, Giuseppina, SANTAMARIA, Raffaele   +2 more
openaire   +2 more sources

Accuracy of direct georeferencing strategies to monitor geomorphological features

2022
<p>Geomorphic systems face significant changes of climate, land uses, vegetation cover and socio-demographic characteristics. In this context, the accurate monitoring of geomorphological features may be a relevant tool to understand the consequences and the risks of these changes.
Álvaro Gómez-Gutiérrez, Manuel Sánchez-Fernández, José Juan de Sanjosé-Blasco, Francisco Lavado-Contador   +3 more
openaire   +1 more source

Accuracy analysis of MAMS data using direct georeferencing

2012 Second International Workshop on Earth Observation and Remote Sensing Applications, 2012
The conventional airborne photogrammetry is difficult to implement in some areas, such as marine, deserts, grassland and high mountain regions where the installation of ground control point (GCP) is dangerous or impossible. With the availability of integrated GPS and inertial measurement units (IMU), which are also called POS, this situation is ...
null Kuifeng Luan, null Peng Chen, null Songlin Zhang, null Xiaohua Tong, null Yanhua Ma, null Wei Wang, null Rong Shu, null Shijie Liu   +7 more
openaire   +1 more source

Direct georeferencing of ADS40 using calibrated POS data

2011 International Conference on Multimedia Technology, 2011
The ADS40 is airborne three-line-push broom imaging sensor integrated with POS, which developed by L. H. Corporation. Due to the accuracy of POS, especially the accuracy of orientation cannot meet the requirement for large scale mapping. This paper provides mathematical model for POS data calibration using a few GCPs.
null Li ran, null Sun ke
openaire   +1 more source

Approximate Correction of Length Distortion for Direct Georeferencing in Map Projection Frame

IEEE Geoscience and Remote Sensing Letters, 2013
Many geometric distortions, such as earth curvature distortion and length distortion, exist in the map projection frame. Therefore, in aerial photogrammetry, if direct georeferencing is performed in the map projection frame, the crucial work becomes compensating for the effect of the various geometric distortions.
Yongjun Zhang 0002, Xiang Shen
openaire   +1 more source