Difference between revisions of "MGI / Balkans coordinate systems"

m (Validation of CRS parameters)
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| [[Image:T249_plot.jpg|thumb|left|400px|Referent point T249 as seen on the satellite image ([http://twcc.free.fr/?l=en&sc=WGS84&dc=UD1&wgs84=18.69675904512405%252C45.562860203666695 open] in the The World Coordinate Converter).]]
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| [[Image:T249_plot.jpg|thumb|left|400px|Referent point T249 as seen on the satellite image.]]
 
| [[Image:T249_map.jpg|thumb|left|400px|Referent point T249 as seen on a detailed map.]]
 
| [[Image:T249_map.jpg|thumb|left|400px|Referent point T249 as seen on a detailed map.]]
 
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Note that the definition of the MGI / Balkans coordinate systems ([http://spatialreference.org/ref/epsg/31275/ EPSG:31275], [http://spatialreference.org/ref/epsg/31276/ EPSG:31276], [http://spatialreference.org/ref/epsg/31277/ EPSG:31277]) available via [http://spatialreference.org http://spatialreference.org] is incomplete because this database does not contain any definition of the geodetic datum. If the geodetic datum is missing, the difference from the true location will be even few hundreds of meters. In fact, if only one datum shift parameter is missing or is in error, transformation of coordinates will lead to frustrations. On the other hand, even if you correctly set-up the (global) coordinate system parameters, you will not be able to achieve precision better than 0.5 meters (see above).  
 
Note that the definition of the MGI / Balkans coordinate systems ([http://spatialreference.org/ref/epsg/31275/ EPSG:31275], [http://spatialreference.org/ref/epsg/31276/ EPSG:31276], [http://spatialreference.org/ref/epsg/31277/ EPSG:31277]) available via [http://spatialreference.org http://spatialreference.org] is incomplete because this database does not contain any definition of the geodetic datum. If the geodetic datum is missing, the difference from the true location will be even few hundreds of meters. In fact, if only one datum shift parameter is missing or is in error, transformation of coordinates will lead to frustrations. On the other hand, even if you correctly set-up the (global) coordinate system parameters, you will not be able to achieve precision better than 0.5 meters (see above).  
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[[Image:T249_in_The_World_Coordinate_Converter.jpg|thumb|left|500px|Referent point T249 shown in [http://twcc.free.fr/?l=en&sc=WGS84&dc=UD1&wgs84=18.696612475%252C45.56288883 The World Coordinate Converter]. This uses the geodetic datum parameters from [http://spatialreference.org/ref/epsg/31276/ http://spatialreference.org].]]
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Revision as of 11:39, 19 September 2010