Global navigation satellite system (GNSS)

Note: I (Bendik) have copy-pasted this as it was from the report. I don't think it is very good or that it necessarily belongs here. Review/revise.

Quick summary

Figure 1: Combination of 1D and 2D models in BASEMENT (source: VAW).

Figure 2: Graphical user interface of BASEMENT (source: VAW) (click to enlarge).

Figure 3: Visualization of BASEMENT results with QGIS plugin Crayfish (source: VAW) (click to enlarge).

Developed by: USA, EU, China, Russia

Date:

Type: Method

Suitable for the following [[::Category:Measures|measures]]:

Introduction

GPS is often used as a synonym for all of the different systems (Table 1).

Table 1: Different systems called as GPS.

System	BeiDou	Galileo	GLONASS	GPS
Owner	China	European Union	Russia	United States
Coverage	Regional, global by 2020	Global by 2020	Global	Global
Status	Basic service by 2018, to be complete by H1 2020	Operating since 2016, 2020 completion	Operational	Operational
Precision	10 (public) 0.1m (encrypted)	1m (public) 0.01m (encrypted)	4.5m - 7.4m	15m (no DGPS or WAAS)

Application

The 1D model of BASEMENT is based on river cross sections and its main application are river reaches where the level of detail is less important. The 2D model uses a triangular computational grid to reproduce the topography and can be applied to more detailed and complex problems than the 1D model, e.g. the inundation or river bar formation. BASEMENT supports Windows as well as Linux platforms and includes a graphical user interface (GUI) which supports the user during the model setup and simulation process (Figure 2). For grid generation, the QGIS plugin BASEmesh is provided by the developers and for visualization of the results, among others, the QGIS plugin Crayfish (QGIS 2.8) from Lutra Consulting (https://www.lutraconsulting.co.uk) can be used (Figure 3).

Other information

In addition to the use on regular Windows and Linux workstations, the upcoming version 3.0 of BASEMENT (March 2019) is designed to run on graphical processing units (GPUs) and distributed memory computer clusters allowing engineers to tackle problems with very large computational domains or long simulation time.

Relevant literature

• Vetsch D., Siviglia A., Caponi F., Ehrbar D., Gerke E., Kammerer S., Koch A., Peter S., Vanzo D., Vonwiller L., Facchini M., Gerber M., Volz C., Farshi D., Mueller R., Rousselot P., Veprek R., Faeh R. 2018. System Manuals of BASEMENT, Version 2.8. Laboratory of Hydraulics, Glaciology and Hydrology (VAW). ETH Zurich. Available from http://www.basement.ethz.ch.

Contact information

Website (download, tutorials, etc.): http://www.basement.ethz.ch

Email: basement@ethz.ch