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same datum position, different positions

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same datum position, different positions Empty same datum position, different positions

Post  hansabbink on Sun Dec 18, 2011 1:27 pm

I have calibrated 2 historical maps of my hometown Utrecht with ozi explorer, so I can walk through the city and see my position in 1500 and 1900). Both have been calibrated by the same 3 points, and have the same datum WGS 84 and the same projection Latitude / Longitude.
In ozi explorer the maps are both correct calibrated. Waypoints are on the same position in both maps.
I have coverted both maps using oruxmapsdesktop. If I look in oruxmaps, the positions in the maps are not the same anymore. Even on the calibrated points. One map is correct, one map is off about 100 meter. I have tried different projections, but there is always a difference in position. I have no idea how to fix it. Can anyone help?
For the maps see:
ozi maps:
http://www.bankstraat68.nl/gps/utrechtdeventerB.map
http://www.bankstraat68.nl/gps/utrechtdeventer1.jpg (6 mb)

http://www.bankstraat68.nl/gps/berlageA.map
http://www.bankstraat68.nl/gps/berlage.jpg

orux maps
http://www.bankstraat68.nl/gps/deventer/UtrechtdeventerB.otrk2.xml
http://www.bankstraat68.nl/gps/deventer/OruxMapsImages.db

http://www.bankstraat68.nl/gps/BerlageA.otrk2.xml
http://www.bankstraat68.nl/gps/OruxMapsImages.db (5 mb)

hansabbink

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same datum position, different positions Empty Re: same datum position, different positions

Post  orux on Sun Dec 18, 2011 5:05 pm

hansabbink wrote:I have calibrated 2 historical maps of my hometown Utrecht with ozi explorer, so I can walk through the city and see my position in 1500 and 1900). Both have been calibrated by the same 3 points, and have the same datum WGS 84 and the same projection Latitude / Longitude.
In ozi explorer the maps are both correct calibrated. Waypoints are on the same position in both maps.
I have coverted both maps using oruxmapsdesktop. If I look in oruxmaps, the positions in the maps are not the same anymore. Even on the calibrated points. One map is correct, one map is off about 100 meter. I have tried different projections, but there is always a difference in position. I have no idea how to fix it. Can anyone help?
For the maps see:
ozi maps:
http://www.bankstraat68.nl/gps/utrechtdeventerB.map
http://www.bankstraat68.nl/gps/utrechtdeventer1.jpg (6 mb)

http://www.bankstraat68.nl/gps/berlageA.map
http://www.bankstraat68.nl/gps/berlage.jpg

orux maps
http://www.bankstraat68.nl/gps/deventer/UtrechtdeventerB.otrk2.xml
http://www.bankstraat68.nl/gps/deventer/OruxMapsImages.db

http://www.bankstraat68.nl/gps/BerlageA.otrk2.xml
http://www.bankstraat68.nl/gps/OruxMapsImages.db (5 mb)

Hi,

Surely the old map, which comes from the National Library of Spain Smile was not built with the projection longitude/latitude. Try 'Flat Earth' projection.

Remember to use the button 'reset map sources' after changing a map with another of the same name. Because OruxMaps does not reread calibration files; it does not know the content has changed.

There is a difference as Ozi uses the projection longitude/latitude, that I do not understand. So when the map is not really using this projection, may not work very well in OruxMaps.

orux

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orux

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same datum position, different positions Empty Re: same datum position, different positions

Post  hansabbink on Mon Dec 19, 2011 9:54 pm

Yes, it's a map made for the spanish to fight the dutch (perdieron! :-)). There is a map for almost every city in the netherlands and belgium.
Thanks for your quick answer. It works! this was the solution.
keep on the good work!

greetings, Hans

hansabbink

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same datum position, different positions Empty Re: same datum position, different positions

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