Digital Finite Element Height Reference Surface (DFHRS)

The New Approach for Online GNSS / GPS-Heighting

 

Contents

 

Concept

 

Quality Control

 

Literature

 

Projects

 

Dip/BSc/Msc Thesis

 

Companies

 

Service

 

News

 

Contact

 

Links

 

 

 DFHRS - Support and Softwareproducts 


DFHRS Support and Application - Software with DFHRS_DLL - Interface

Geosystems

·         MAGAELLAN (Former: Thales Navigation)

     DFHBF-Support

     DFHBF-Support durch GART2000 (ALLSAT)

·         Trimble Survey Manager Software (TSM)

·         TGO, ACU

·         MAP500 - DFHBF Support  / -DFHBF-Support Netherlands

·         Trimble Support und Training (DFHBF)

 

DFHRS Project  - Cooperation Partner

Distribution of DFHRS-Data-Bases and

Distribution and Implementation of DFHRS_DLL for a DFHRS-DataBase Access

Service and Support

·         OLGA_PRO  - Program for communication with GNSS-Receivers. Online processing and transformations of GNSS-positions based on NMEA

·         USE3DIM Software - DFHRS Application in online and postprocessed mode (WIN 9x / 2000 / XP / CE )

·         DFHRS_DLL Interface in GNSS- and GIS-Software

       TOPCON-, THALES/MAGELLAN-, Leica-, Trimble- Receivers

       DFHBF-Information by ALLSAT (Download pdf)

 

        THALES/MAGELLAN-, Leica-, Trimble, TOPCON-Empfänger

 

  • Vestra (GIS-Software)

 

DFHRSF_DLL

The DFHRS_DLL is the basic  interface for the implementation of any DFHRS_DB-Access into GNSS-Controllers, GNSS-Grid-Factories, GIS-Windows-Software and for the Setup of the new RTCM 3.0 Height Positioning Message based on DFHRS-Databases .

Fig.: DFHBF-DLL as implemented in the Windowes postprocessing Software DFHBF-Tools

 

DFHRS - Software

To compute Digital-Finite-Element Height Reference Surfaces, the C++-based DFHRS-software has been developed at Karlsruhe University of Applied Sciences (HSKA) since 1999. Besides several functions for visualisation and utilities for an automatic and a manual meshing and a powerful least-squares adjustment is implemented in the DFHRS production software. It enables a sophisticated quality control including gross error detection, reproduction quality estimates, and variance component estimation for all observations and observation groups respectively. The DFHRS production software finally also sets up the DFHRS data base in a compressed format. 

Fig : The DFHRS-Production Software. Special tools for Visualisation of Observations (identical Points (green) Geoid-heights (grey) and different Continuity Conditions (blue)). Right: Example of a DFHRS meshing in the country Baden Württemberg (part of Germany). The whole area was subdivided into 28 "Patches", each with its own set of datum parameters. The resulting mean accuracy was 1,0 cm.