National Report of Sweden to the NKG General ... - Lantmäteriet

5a flexible and redundant service, tailormadeversion 4.2 to version 5.0 of the Bernese19KMS = Kort & MatrikelstyrelsenGPS software.for large-scale infrastructureprojects (Hedling et al., 2009). FurtherThe SWEPOS Network RTK Servicedensifications are taking place duringwas launched with regional coverage2010 in the area around Stockholm, onon January 1st 2004, using the VRS 18the west-coast of Sweden and in thetechnique. The service has been southern part of Sweden.expanded with regional one-year-longestablishment projects and it has duringExisting guidelines concerning the use2010 reached national coverage. Sinceof the network RTK service have beendata from permanent GNSS stations isimproved during the last yearexchanged between the Nordic(Odolinski, 2010). Several parameterscountries, good coverage of the servicehave been handled as well as timein border areas and along the coasts hascorrelation effects for points measuredbeen obtained during the last years byclose to each other in time.the inclusion of 9 Norwegian SATREFstations, 7 Finnish Geotrim stations, 3Danish Leica SmartNet stations and 1Danish KMS 19 station.A project called “Close-RTK” has alsobeen performed during the last year,with an effort to assess the quality ofthe present network RTK technique, aswell as future development scenarios ofThe service has broadcasted RTK datafor both GPS and GLONASS sinceApril 1 st 2006 and has today (Septemberspace (GNSS) and ground (SWEPOS)infrastructure (Emardson et al., 2009and Jämtnäs et al., 2010). The project2010) approximately 1480 subscriptions, was initiated by Lantmäteriet, SPwhich means approximately 1030 new Technical Research Institute of Swedenusers since the last NKG General and Chalmers University ofAssembly.Technology. Parameters that weredeeply studied were different sourcesDuring February 2008, a survey of theof uncertainty in measurements (e.g.users of SWEPOS and its services wasatmospheric and local effects), futurecarried out by questionnaire. Thesatellite systems as Galileo andsurvey had special focus on theCompass and a general densification ofnetwork RTK service. Close to 400the SWEPOS network (with 35 kmanswers were received from the 950between the stations).users that the service had at that point.Most of the users were very satisfiedwith the performance and “customersupport” of the network RTK serviceand considered it to be worth its price.SWEPOS also offers a single frequencyNetwork DGNSS Service that waslaunched on April 1 st 2006. Both thisservice and the network RTK serviceare using the network RTK/DGNSSThere is an increasing use of RTK forsoftware GPSNet from Trimble andmachine guidance. To meet this, somedensifications of the SWEPOS network GSM 20 or GPRS 21 (i.e. mobile Internethave been done. In these areas are connection) as the main distributionSWEPOS Network RTK Service used as channels.18VRS = Virtual Reference Station20GSM = Global System for Mobile communication21GPRS = General Packet Radio Service