EDAS (EGNOS Data Access Service): Differential GPS corrections Performance Test with State-of-the-art Precision Agriculture System

2017 ◽  
Author(s):  
J. V�zquez ◽  
E. Lacarra ◽  
M.A. S�nchez ◽  
J. Rioja ◽  
J. Bruzual
Keyword(s):  
Precision Agriculture ◽  
Performance Test ◽  
State Of The Art ◽  
Data Access ◽  
Differential Gps ◽  
Access Service

scholarly journals EDAS (EGNOS Data Access Service) Differential GNSS Corrections: A Reliable Free-of-Charge Alternative for Precision Farming in Europe

2019 ◽  
Vol 26 (1) ◽  
pp. 46-58 ◽  
Author(s):  
J. Vázquez ◽  
E. Lacarra ◽  
J. Morán ◽  
M.A. Sánchez ◽  
A. González ◽  
...  
Keyword(s):  
Precision Agriculture ◽  
Data Access ◽  
Precision Farming ◽  
Mobile Internet ◽  
Reference Station ◽  
Differential Gps ◽  
Access Service ◽  
Guidance Systems ◽  
The Impact ◽  
Accuracy Performance

Abstract EDAS (EGNOS Data Access Service) is the EGNOS internet broadcast service, which provides free of charge access to the data collected and generated by the EGNOS infrastructure. EDAS disseminates over the Internet, both in real time and via an FTP archive, the raw data of the GPS, GLONASS (no commitment on GLONASS data is provided (1)) and EGNOS GEO satellites collected by the receivers located at the EGNOS reference stations, which are mainly distributed over Europe and North Africa. The EDAS services offer several types of GNSS data in various protocols and formats, such as DGNSS corrections. This paper reports on the results of some in-field tests conducted by ESSP and Topcon Agriculture to confirm the suitability of EDAS DGNSS corrections for precision farming in Europe. The European Commission (EC) is the owner of EGNOS system (including EDAS) and has delegated the exploitation of EGNOS to the European GNSS Agency (GSA). EDAS service provision is performed by ESSP, as EGNOS Services Provider, under contract with the GSA, the EGNOS program manager. In the ENC 2018 article “EDAS (EGNOS Data Access Service): Differential GPS corrections performance test with state-of-the-art precision agriculture system”, ESSP and Topcon Agriculture presented the results of the first in-field test conducted in a dynamic and real-life environment in the summer of 2017. The test results indicated that the EDAS DGNSS corrections could enable a reliable pass-to-pass accuracy performance for a wide range of precision agriculture applications and become an attractive solution for cereal farms, when the farm is located in the vicinity of an EGNOS reference station. In particular, Topcon Agriculture acknowledged that the observed performance was sufficient to support the following precision agriculture applications: spraying and spreading of any crop type, tilling and harvesting of cereal. Then, ESSP and Topcon Agriculture engaged in additional testing activities to further characterise the EDAS DGPS performance in different scenarios (i.e. at various European locations and with a variety of distances between the designated farm and the target EGNOS reference station). In each test, multiple runs with the rover tractors have been performed over the reference patterns predefined in the Topcon guidance systems. Data recorded during the tests has been analysed in detail, looking at the key performance indicators (e.g. cross track error and pass-to-pass performance) that characterize the EDAS DGPS performance for precision agriculture applications. Different techniques for the computation of the pass-to-pass accuracy performance have been used, including a procedure to measure live in the field and a post-processing alternative. The diversity of scenarios available allows drawing conclusions on the applicability of EDAS DGPS corrections (in terms of maximum distance from the target EGNOS station) for precision agriculture and also understanding the impact of operationally relevant aspects such as the quality of the mobile internet coverage (highly variable across Europe). The EDAS system and its architecture, the main types of data disseminated through EDAS services and the online information available to the EDAS users are introduced in this paper. In particular, the EDAS Ntrip service is described in detail, since it provides the differential corrections to the GPS and GLONASS satellites at the EGNOS reference stations in RTCM format, which are the basis for the present study. The article also reports on the results of the latest tests, which have been performed using Topcon receivers, vehicles and auto-steering systems. In all cases, two different Topcon guidance systems on board tractors were running simultaneously to assess the EDAS DGPS positioning performance with respect to a the reference provided by a top-performing RTK-based Topcon solution. The objective of this paper is to draw conclusions on the use of EDAS DGPS corrections as a reliable free-of-charge alternative for precision farming in Europe (especially for cereal farms), based on the available performance results from the testing campaign and the feedback from the involved precision agriculture experts.

Towards Ubiquitous Data Access Service of 3D Part Library in Cloud Scheme with Host Independence

2021 ◽  
Author(s):  
Wei Liu ◽  
Chuipin Kong ◽  
Qiang Niu ◽  
Xionghui Zhou
Keyword(s):  
3D Modeling ◽  
Data Access ◽  
Mobile Terminals ◽  
Cad Systems ◽  
Manufacturing Enterprises ◽  
3D Data ◽  
Uniform Interface ◽  
Access Service ◽  
Ongoing Project ◽  
Remote Part

Abstract Most current part libraries are created and deployed in specific usage environments or CAD platforms, which inevitably brings obstacles in the share and exchange for part information. To reduce repeated development and provide a uniform interface for designers in different sites, a 3D part library in cloud scheme is presented in this paper. Host programs with predetermined specification can access the part data through an adapter according to their customized requests with uniform interfaces, which constructs a ubiquitous service. To realize host independence, the part models are created in a native ACIS modeler, and then they are converted into 3D files in various formats for practical needs, finally these files are imported into CAD systems or other platforms in real designs. The whole framework can be divided into three components, namely, PLS(Part Library Service) provider, PLS adapters and hosts. PLS provider is the kernel of 3D data access service in cloud scheme, while PLS adapters serve as the bridges that connect PLS provider and hosts, and the PLS can be grafted on various applications including current mainstream CAD systems as a plug-in module or run on the websites or even mobile terminals. The PLS provider is deployed and maintained on cloud and users can acquire remote part information within a local ongoing project. In the detailed construction of this part library, diversiform knowledge for part parameters and structures is implanted to define the geometry and rule constraints in the 3D modeling, with which the backstage has the ability of conveniently editing the information in the part library for better upgrade and contrapuntally services. The concept has been implemented within a PaaS framework to provide the ubiquitous 3D part data access, which has been successfully applied in a large number of manufacturing enterprises, and accumulates considerable practical cases.

A Secure Wireless Data Access Service for the Government of Canada

2007 ◽  
pp. 318-338
Author(s):  
Howie Macumber ◽  
Bing Cheung
Keyword(s):  
Data Access ◽  
Spectrum Management ◽  
Public Works ◽  
Wireless Data ◽  
Ieee 802.11B ◽  
Government Services ◽  
Access Service ◽  
The Government ◽  
Government Of Canada ◽  
Technological Perspective

This chapter examines work conducted by Public Works and Government Services Canada, a department of the Government of Canada (GoC), to assess the potential for a Secure Wireless Data Access Service (SWDAS) that is envisaged to be provided as a common service to departments and agencies of the GoC. The main focus of the work has been on Wi-Fi, especially the IEEE 802.11b standard, and its application. Areas examined include technology, security, spectrum management, user surveys, applications, business, ?nance, service trial, future trends, and recommendations for the implementation of Wi-Fi in government. It is demonstrated that the application of Wi-Fi technology in the GoC would be bene?cial for the government workforce from both a ?nancial and a technological perspective.

An Architectural Overview of the GRelC Data Access Service

2009 ◽  
pp. 98-108 ◽  
Author(s):  
Sandro Fiore ◽  
Alessandro Negro ◽  
Salvatore Vadacca ◽  
Massimo Cafaro ◽  
Giovanni Aloisio ◽  
...  
Keyword(s):  
Data Access ◽  
Data Grid ◽  
Distributed Data ◽  
Distributed Environment ◽  
Database Access ◽  
Grid Environments ◽  
Grid Database ◽  
Access Service ◽  
Real Challenge ◽  
Grid Storage

Grid computing is an emerging and enabling technology allowing organizations to easily share, integrate and manage resources in a distributed environment. Computational Grid allows running millions of jobs in parallel, but the huge amount of generated data has caused another interesting problem: the management (classification, storage, discovery etc.) of distributed data, i.e., a Data Grid specific issue. In the last decade, many efforts concerning the management of data (grid-storage services, metadata services, grid-database access and integration services etc.) identify data management as a real challenge for the next generation petascale grid environments. This work provides an architectural overview of the GRelC DAS, a grid database access service developed in the context of the GRelC Project and currently used for production/tutorial activities both in gLite and Globus based grid environments.

scholarly journals Applications of UAV Thermal Imagery in Precision Agriculture: State of the Art and Future Research Outlook

2020 ◽  
Vol 12 (9) ◽  
pp. 1491 ◽  
Author(s):  
Gaetano Messina ◽  
Giuseppe Modica
Keyword(s):  
Precision Agriculture ◽  
State Of The Art ◽  
Plant Stress ◽  
Stress Conditions ◽  
Plant Diseases ◽  
Basic Knowledge ◽  
Plant Phenotyping ◽  
Future Research ◽  
Thermal Data ◽  
Low Altitude

Low-altitude remote sensing (RS) using unmanned aerial vehicles (UAVs) is a powerful tool in precision agriculture (PA). In that context, thermal RS has many potential uses. The surface temperature of plants changes rapidly under stress conditions, which makes thermal RS a useful tool for real-time detection of plant stress conditions. Current applications of UAV thermal RS include monitoring plant water stress, detecting plant diseases, assessing crop yield estimation, and plant phenotyping. However, the correct use and interpretation of thermal data are based on basic knowledge of the nature of thermal radiation. Therefore, aspects that are related to calibration and ground data collection, in which the use of reference panels is highly recommended, as well as data processing, must be carefully considered. This paper aims to review the state of the art of UAV thermal RS in agriculture, outlining an overview of the latest applications and providing a future research outlook.

scholarly journals State-of-the-art on Precision Agriculture

2003 ◽  
Vol 12 (4) ◽  
pp. 259-273 ◽  
Author(s):  
Sakae Shibusawa
Keyword(s):  
Precision Agriculture ◽  
State Of The Art

scholarly journals Performance Evaluation of the New AMS System at Accium BioSciences

Radiocarbon ◽  
2007 ◽  
Vol 49 (1) ◽  
pp. 171-180 ◽  
Author(s):  
Ugo Zoppi ◽  
James Crye ◽  
Qi Song ◽  
Ali Arjomand
Keyword(s):  
Performance Test ◽  
Dynamic Range ◽  
State Of The Art ◽  
Test Results ◽  
Sample Processing ◽  
Wide Range ◽  
Chemical Background ◽  
Technical Details ◽  
Precision And Accuracy ◽  
New Facility

A new compact accelerator mass spectrometry (AMS) system dedicated to the measurement of radiocarbon has been commissioned at the Accium BioSciences headquarters in Seattle. The entire facility (including ancillary laboratories for the preparation of graphite targets) has been designed to handle samples with a wide range of 14C concentrations. In this paper, we discuss the technical details of the new facility and present performance test results demonstrating state-of-the-art capabilities. In particular, modern samples can be readily measured with 0.3% precision and accuracy, machine background levels are consistently in the low 10-16 (14C/12C), and chemical background is approximately equivalent to a fraction of modern of 0.004. In addition, when 100-times-modern samples were processed, no increase in background was observed, either during sample processing or during AMS measurement. This corresponds to a dynamic range for 14C analysis of 6 orders of magnitude.

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