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Transformation av stomnät till SWEREF 99: Fallstudie Norra Vätö, Norrtälje kommun 
University West, Department of Engineering Science.
University West, Department of Engineering Science.
2010 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Transformation of the Core Network to SWEREF 99 : Case Study of North Vätö, Norrtälje municipality  (English)
Abstract [sv]

Sverige har under lång tid haft flera olika koordinatsystem, både nationella och lokala. Nu genomförs en övergång till ett gemensamt koordinatsystem som kallas SWEREF 99.

I Norrtälje kommun finns stomnät som är noterade i ett flertal olika koordinatsystem, med ursprung i tidigare förrättningar. Åtskilliga av dessa har dålig orientering i kända nationella koordinatsystem men däremot god inre noggrannhet.

I detta arbete väljs 12 stomnät för transformation till SWEREF 99 18 00. Detta görs genom att passpunkter mäts in med GNSS-teknik. De inmätta punkterna används sedan för att transformera stomnäten som de är noterade i. Detta gör att i framtiden kan till exempel husutsättningar i de aktuella områdena utföras med enbart GNSS-teknik.

Stomnäten som väljs finns på norra delen av ön Vätö i Norrtälje kommun.

GNSS-utrustningen som används för att mäta in punkterna är Leica 1203 nätverks-RTK. De valda passpunkterna mäts in vid två tillfällen med minst 45 minuters mellanrum. Vid varje tillfälle görs 10 mätningar. Sedan beräknas medelvärdet av 20 mätningar.

När alla punkter väl har mätts in görs transformationer från tre olika från-system till SWEREF 99 18 00. De tre från-systemen är RT 38 2,5 gon V, RT R09 0 gon och ett lokalt 1000/1000-system. Eftersom områdena som är noterade i RT 38 är dåligt orienterade gentemot varandra ger det dålig noggrannhet att transformera hela RT 38-området på en gång. Därför delas RT 38-området in i flera transformationsområden.

När transformationen gjorts kontrollmäts fastighetsgränser i ett gränsområde där gränspunkternas koordinatsystem är osäkert. Avslutningsvis kontrollmäts en Rix 95-punkt med namnet Klockarängsberget (Rix 95-punktnummer: 119741) som finns på södra delen av Vätö.

Abstract [en]

During the last century different coordination systems have been used in Sweden. Today a common coordination system (SWEREF 99) is used.

In the municipality of Norrtälje, core networks are listed in different coordination systems that are generated from different earlier missions. These networks normally have poor orientation in the known coordination system; however, the internal accuracy is used to be good.

In this study, some of the core networks have been selected to be converted to SWEREF 99 18 00. The conversion has been done by measuring points using the GNSS technology, the measured points were then used to transfer the core network to SWEREF 99 18 00. This means that in the future, staking out a building in the area can be performed solely by GNSS technology. The chosen core networks are located on a part of the island Vätö in the municipality of Norrtälje.

The GNSS equipment used to measure the points with was the Leica 1203 RTK network. The selected points were measured on two occasions with a gap between the occasions of at least 45 minutes. Ten repeated measurements have been done on each point to increase the accuracy. The average of these twenty measurements has been used for conversion.

After the measuring process, the transformation has been done from three different off-systems to SWEREF 99 18 00. The three off-systems were RT 38 2.5 gon V, RT R09 0 gon and a local 1000/1000-system. Since the areas listed in the RT 38 were poorly oriented towards each others, poor accuracy was achieved during the transformation of the entire RT 38 field at once. Therefore, the RT 38 area has been divided into a number of transformations-areas.

When the transformation had been done, control measurements were made on a Rix 95-Point entitled Klockarängsberget (Rix 95-point numbers: 119 741) located on the southern part of Vätö. In addition, control measurements were made of housing estate border area, where the border points were uncertain.

Place, publisher, year, edition, pages
2010. , 51 p.
Keyword [en]
Transformation, Network RTK, Surveying, Core network, Coordinate system, GPS, GNSS
Keyword [sv]
Transformation, Nätverks-RTK, Mätning, Polygonpunkt, Stomnät, Koordinatsystem, GPS, GNSS
National Category
Environmental Analysis and Construction Information Technology
Identifiers
URN: urn:nbn:se:hv:diva-2739OAI: oai:DiVA.org:hv-2739DiVA: diva2:357252
Uppsok
Technology
Supervisors
Examiners
Available from: 2010-10-20 Created: 2010-10-15 Last updated: 2010-10-20Bibliographically approved

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