AdministrativeUnits. Jiří Poláček

Transcription

1 AdministrativeUnits Jiří Poláček

2 Agenda Data sources and discrepancies ETRS89 coordinates on the state borders Mapping on the Czech state boundaries KEN INSPIRE workshop - Prague Stránka 2

3 Data source forau theme Official source is RÚIAN data Parcel boundaries keeps information about the level of administrative unit (cadastralunit, municipality, county, ) Geometry of the administrative units(including state boundaries) is derived as an envelope of parcels(no gaps are allowed) Even for non-digitized cadastral units exists digitized boundaries with compliant topology State boundary is implemented in the map after the international treaty came into force Parcels(maps) can be edited by cadastral workplaces only! KEN INSPIRE workshop - Prague Stránka 3

4 Differenttypesofthedigitization ELF workshop Stránka 4

5 Otherdata source -ZABAGED ZABAGED - Fundamental Base of Geographic Data Basedon 1: scale Administrative units has been digitized at first, now RÚIAN data are used as well Data gained from surveying department are implemented immediately after approved by Border Commisions TN, HY edge matched to boundary KEN INSPIRE workshop - Prague Stránka 5

6 KEN INSPIRE workshop - Prague Stránka 6

7 Discrepancieson thestateboundary Errors in the cadastral map (state boundary from the international treaty has not been correctly introduced into the map) We can fix it(cadastral workplaces have a final term ) Different coordinate systems in neighbouring countries => different ETRS89 state boundary The final solution will take years KEN INSPIRE workshop - Prague Stránka 7

8 Coordinatetransformation Calculated coordinates S-42/83 Coordinates Transformation ETRS coordinates Polish 0,5m Field measurement S-JTSK Coordinates ETRS Coordinates Czech Other Accurate 10cm Transformation method: Approved ETJTZU 2013: mxy=2,5 cm Interpolation of corrections in correction grid Other : mxy=50cm used in majority of commercial GIS SW. KEN INSPIRE workshop - Prague Stránka 8

9 Finalsolutionforstateboundaryin ETRS89 coordinates Generally once the international treaty on the state boundary isbasedon differentnationalcoordinates, the ETRS89 national implementation is influenced by the precision of the national trigonometric network. In this case accurate coordinates(treaty level) of the state boundary in ETRS89 are not available. To getthem, additionalgps measurements are necessary as well as the elevation of boundary points has to betakenintoaccount. KEN INSPIRE workshop - Prague Stránka 9

10 Czech stateboundaries-legalstatus KEN INSPIRE workshop - Prague Stránka 10

11 Czech stateboundaries-legalstatus Measurement is based on the ETRS89 Measurement finished in 1 year Treaty??? Measurement based on the ETRS89 postponed until some changes of the boundary are accomplished Measurement is based on the ETRS89 Measurement finished in 3 years Treaty??? Discussion about ETRS89 measurement started ETRS89 on the treaty level KEN INSPIRE workshop - Prague Stránka 11

12 Conclusion Commonunique ETRS89 coordinates of the state boundaries are crucial for crossborder data harmonization Final solution for Europe international treaties on the state boundariesbasedon theetrs89 coordinates-isnecessary, but it will take years(additional measurement and processing). In the meantime an adjusted common boundary for edgematchingofotherthemes(hy, TN, )has to beused(canwefit for example CP theme to this boundary?) A specialcoordinatetransformationto theetrs89 (basedon dynamicgrid) isbeingpreparedto fit otherthemes(cp, BU) to the state boundary. KEN INSPIRE workshop - Prague Stránka 12

13 Thankyouforyourattention KEN INSPIRE workshop - Prague Stránka 13