a spatial reference system (by co-ordinates) for europe

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A Spatial Reference System for Europe 1

AASpatial Reference SystemSpatial Reference System

(by co-ordinates)(by co-ordinates)for Europefor Europe

[email protected]

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topicstopics

Reference systems : a reminder Transformation and conversion Spatial Reference System Workshop

: a 1999 SAI/MEGRIN initiative Spatial Reference System for Europe

: recommendations

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? egg or grapefruit ?? egg or grapefruit ?

do we live on the same planet??

….why different spatial reference systems?

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geo-referencing by geo-referencing by co-ordinatesco-ordinates

datum(physical)

coordinate system(m athematical)

coordinate reference system

indirectreference system

position

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geodeticgeodetic datum datum Z

X

Y

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map coordinatesmap coordinates

E

N

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ellipsoïd to planellipsoïd to plan

h

E

N

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heightsheights

geoid

earth surface

ellipsoid

h

N

H

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change of systemchange of systemDatum 1

N, E, (h)

X, Y, Z

, (h)

N, E, (h)

X, Y, Z

, (h)

Datum 2

transformation

conversion

conversion

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why different systems (1)?why different systems (1)?

geoid

earth surface

ellipsoid

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why different systems (2)?why different systems (2)?

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issuesissues Conversion

– mathematical – exact (exception : N)

Transformation– empirical– precision depending on measurements

All changes– time-consuming– risks of errors, discrepancies

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problems...problems...

Limitless and ever expanding list of ’systems’ (national, regional, local)

Increasing needs for large amount of data to be processed ‘on-the-fly’

What specification to include in the CEC call for tenders ?

Etc ...

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… … and solutionsand solutions

SAI / MEGRIN Expert Workshop– Marne la Vallée, 29-30/11/99

15 participants– CEC (JRC, DG13, EUROSTAT)– EEA, EUROCONTROL, MEGRIN, EUROGI– Geodesy Experts : EUREF, ISO, CEN, OGC,

CERCO, etc..

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1- the European system 1- the European system already exists for the expertsalready exists for the experts

ITRS : the global reference European Continental Plate moves

uniformly ~3cm per year

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5 cm /year

ITR F93

NNR-NUV EL1A

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1- the European system 1- the European system already exists for the expertsalready exists for the experts

ITRS : the global reference European Continental Plate moves

uniformly ~3cm per year The EUREF sub-Commission of IAG ETRS89

– stable – shift to global ITRS known (and WGS84)– transfo. parameters known for most

European countries!

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2- recommendations2- recommendations No map projection suitable for all pan-

European applications Geo-referenced co-ordinates for the CEC

would be geographic co-ordinates () on ETRS89

NMAs to place 1~2 m. accuracy transformation algorithms in public domain

EUREF/CERCO to collect and manage high accuracy transformations

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3- heights3- heights

nationally defined heights may differ by several dm. (2.3 m. for Belgium)

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3- heights3- heights

nationally defined heights may differ by several dm. (2.3 m. for Belgium)

no uniform European height system available yet

EULN in preparation by EUREF/EUVN Recommendation : that the CEC adopts

the EUVN results when made available

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ConclusionsConclusions

interoperability and integration of data interoperability and integration of data from different sources still a key issuefrom different sources still a key issue

co-ordinate interoperability is an easily co-ordinate interoperability is an easily overcome obstacle:overcome obstacle:– recommend implementation of the existing recommend implementation of the existing

common reference systems (ETRS89, EULN)common reference systems (ETRS89, EULN)– distribute ‘validated’ transformation toolsdistribute ‘validated’ transformation tools

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proceedings edited by JRC/SAI

also available at

http://www.megrin.orghttp://www.megrin.org

a spatial reference system (by co-ordinates) for europe

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