Terrain attributes are commonly used to explain the spatial variability of agronomic, pedologic, and hydrologic variables. The terrain attributes studied here (elevation, slope, aspect, and curvature) are estimated readily from digital elevation models (DEMs), but questions remain about how the accuracy and sample spacing of the elevation data affect the estimated attributes. The main objective...

The additional gain provided on the satellite signals by the HAGR enables sub-meter Pseudo-ranges to be observed directly on the C/A code and also improves the accuracy of the GPS carrier phase and estimates of the satellite signal strength. The directivity of the digital beams created from the antenna array also reduces multipath errors further improving the accuracy of DGPS corrections genera...

Anvina ist ein Navigationsund Informationssystem zur Schlagvermessung, Bodenprobennahme, Felddatenerfassung und Gerätesteuerung. Anvina ermöglicht Parallelspurfahren, die Verwendung von georeferenziertem Kartenund Bildmaterial als Grundlage für Orientierungsund Kontrollzwecke (z.B. topografische Karten, Luftbilder). Es erfolgen online Aufzeichnungen von Messwegen und/oder Messpunkten per DGPS. ...

The additional gain provided on the satellite signals by the HAGR enables sub-meter Pseudo-ranges to be observed directly on the C/A code and also improves the accuracy of the GPS carrier phase and estimates of the satellite signal strength. The directivity of the digital beams created from the antenna array also reduces multipath errors further improving the accuracy of DGPS corrections genera...

Global Positioning System (GPS) is proven to be an accurate positioning sensor. However, there are several sources of errors such as ionosphere and troposphere effects, satellite time errors, errors of orbit data, receivers errors, and errors resulting from multi-path effect which reduce the accuracy of low-cost GPS receivers. These sources of errors also limit the use of single-frequency GPS r...

Anthony J. Healey Center for AUV Research Naval Postgraduate School Monterey, CA Abstract-This paper provides an overview of the Naval Postgraduate School ARIES autonomous underwater vehicle and its guidance, navigation and control performance. An attempt is made to highlight its’ current operational capabilities and provide a description of future enhancements for greater mission utility and f...

Digital Elevation Model (DEM) is an important input for geo-spatial analysis. For various applications like flood management, ortho rectification of remote sensing images, navigation, architectural works, defence, etc., high resolution DEM is required. TanDEM-X mission was launched in 2010 to obtain high resolution global DEM with HTRI-3 standard. SAR interferometry (InSAR) technique is used fo...