scholarly journals Evaluation of Positioning Performance for RTK-GPS/GLONASS with Calibrated Inter-channel Hardware Biases

2011 ◽  
Vol 124 (0) ◽  
pp. 103-110
Author(s):  
Hideki YAMADA ◽  
Tomoji TAKASU ◽  
Nobuaki KUBO ◽  
Akio YASUDA
Keyword(s):  
Rtk Gps ◽  
Hardware Biases

scholarly journals A low-cost technique to measure bank erosion proces ses along middle-size river reaches

2018 ◽  
Author(s):  
Gonzalo Duró ◽  
Alessandra Crosato ◽  
Maarten G. Kleinhans ◽  
Wim S. J. Uijttewaal
Keyword(s):  
Laser Scanning ◽  
Spatial Scales ◽  
Low Cost ◽  
Bank Erosion ◽  
Water Levels ◽  
Small Scale ◽  
Observation Distance ◽  
River Bank ◽  
Erosion Processes ◽  
Rtk Gps

Abstract. Diverse methods are currently available to measure river bank erosion at broad-ranging temporal and spatial scales. Yet, no technique provides low-cost and high-resolution to survey small-scale bank processes along a river reach. We investigate the capabilities of Structure-from-Motion photogrammetry applied with imagery from an Unmanned Aerial Vehicle (UAV) to describe the evolution of riverbank profiles in middle-size rivers. The bank erosion cycle is used as a reference to assess the applicability of different techniques. We surveyed 1.2 km of a restored bank of the Meuse River eight times within a year, combining different photograph perspectives and overlaps to identify an efficient UAV flight to monitor banks. The accuracy of the Digital Surface Models (DSMs) was evaluated compared with RTK GPS points and an Airborne Laser Scanning (ALS) of the whole reach. An oblique perspective with eight photo overlaps was sufficient to achieve the highest relative precision to observation distance of ~1:1400, with 10 cm error range. A complementary nadiral view increased coverage behind bank toe vegetation. The DSM and ALS had comparable accuracies except on banks, where the latter overestimates elevations. Sequential DSMs captured signatures of the erosion cycle such as mass failures, slump-block deposition, and bank undermining. Although this technique requires low water levels and banks without dense vegetation, it is a low-cost method to survey reach-scale riverbanks in sufficient resolution to quantify bank retreat and identify morphological features of the bank failure and erosion processes.

EVALUATING THE REPEATABILITY OF RTK GPS

Survey Review ◽  
2011 ◽  
Vol 43 (320) ◽  
pp. 177-186 ◽  
Author(s):  
A. Pirti
Keyword(s):  
Rtk Gps

scholarly journals Quick Response Assessment of the Impact of an Extreme Storm Combining Aerial Drone and RTK GPS

2017 ◽  
Author(s):  
Arthur C. Trembanis ◽  
Enrico Duo ◽  
Stephanie Dohner ◽  
Edoardo Grottoli ◽  
Paolo Ciavola
Keyword(s):  
Warning System ◽  
Response Assessment ◽  
Storm Event ◽  
Quick Response ◽  
Aerial Photos ◽  
Extreme Storm ◽  
Rtk Gps ◽  
Commercial Off The Shelf ◽  
The Impact ◽  
Response Post

Abstract. Developing and implementing a quick response post-storm survey protocol has the potential to improve impact assessments of coastal storms. Pre- and post-event surveys are essential to properly quantify the storm impacts on the coast. In this study, a combination of traditional RTK GPS and Unmanned Aerial Vehicle drone platform was utilized as part of a coordinated storm response workflow. The comprehensive approach employed in this pilot case study was conducted on the Emilia-Romagna coast (Italy), in the immediate aftermath of an extreme storm event that impacted the shoreline on the 5th–6th February 2015 called the Saint Agatha Storm. The activities were supported by timing information on the approaching storm provided by the regional early warning system. We collected aerial photos from a commercial off-the-shelf drone immediately after the Saint Agatha Storm and generated both orthomosaic and digital elevation models utilizing structure-from-motion photogrammetry techniques. The drone- based survey approach allowed us to quickly survey an area of 0.25 km2 within a 10-minute flight resulting in a ground sampling distance of 2.5 cm/pixel. Flooding and erosion impacts are analyzed and presented for the target study area. Limitations and possible applications for coastal management of the quick response post-storm surveying protocol are highlighted.

scholarly journals A Fundamental Study on the Characteristics of Rover Tracking using RTK-GPS

2008 ◽  
Vol 17 (0) ◽  
pp. 195-202
Author(s):  
Tatsunori Sada ◽  
Shogo Egami ◽  
Shigeyuki Murayama
Keyword(s):  
Fundamental Study ◽  
Rtk Gps

scholarly journals Real-time observation of tsunami by RTK-GPS

2000 ◽  
Vol 52 (10) ◽  
pp. 841-845 ◽  
Author(s):  
Teruyuki Kato ◽  
Yukihiro Terada ◽  
Masao Kinoshita ◽  
Hideshi Kakimoto ◽  
Hiroshi Isshiki ◽  
...  
Keyword(s):  
Real Time ◽  
Rtk Gps ◽  
Time Observation ◽  
Real Time Observation

scholarly journals Quasi real-time fault model estimation for near-field tsunami forecasting based on RTK-GPS analysis: Application to the 2011 Tohoku-Oki earthquake (Mw9.0)

2012 ◽  
Vol 117 (B2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yusaku Ohta ◽  
Tatsuya Kobayashi ◽  
Hiroaki Tsushima ◽  
Satoshi Miura ◽  
Ryota Hino ◽  
...  
Keyword(s):  
Real Time ◽  
Near Field ◽  
Fault Model ◽  
Model Estimation ◽  
Tsunami Forecasting ◽  
Analysis Application ◽  
Rtk Gps
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