The European Alps Geoid (EAlpG) Project – a joint initiative for improved cross-border regional geoid modelling and height transformation

• DOI: 10.5194/egusphere-egu23-7431
• Publication Date: 2023-02-25T15:12:41Z
• Authors: Tobias Bauer; Joachim Schwabe

The official national height reference systems in use, apply different definitions of the and zero levels refer to tide gauges epochs. Additionally, treatment permanent is not entirely consistent. This causes differences at decimetre scale, which also vary along borders. "European Alps Geoid Project" (EAlpG) aims harmonize basis for determination Alpine region, including neighbouring lowlands computation a uniform geoid model according European standards positioning.The project based on experiences findings predecessor "D-A-CH geoid" project, covered test area around Lake Constance. It was joint initiative federal state authorities responsible land surveying Germany, Austria Switzerland.First steps EAlpG were conclusion Memorandum Understanding May 2022 as well initiation exchange gravity data. ambitions are therefore intensify cooperation’s between partners regional field modelling provide better information transformations systems. following activities planned:1. Improved cross-border area:Revision harmonization base data calculation models: data, digital elevation models, control points validation Cross-border measurements, e.g. Austria, France, Italy, Switzerland Comparative studies modeling high mountains 2. transformation countries:Extensive comparative investigations surfaces (geoid models other grids) heights borders Derivation consistent accurate few centimeters Development corresponding web application outcomes will support (non-)geodetic users there applications, ground water level investigations, flood protection. Other important applications standardisation engineering projects such tunnels, bridges, supply lines, etc.The results be embedded pan-European within EUREF. Contributing upcoming EUREF Working Group “European Height Reference Surface”, one many cornerstones build an EVRS surface.The organization or involved integrated geodetic spatial Czech Republic, Hungary, Slovakia, Slovenia Switzerland. scientific work supported by various universities Alp area.