1. Geo-reference of historical maps
Geo-spatial sypozium, Cluj, April, 2013
Geo-reference of historical maps
dr. Timár Gábor
Dept. of Geophysics and Space Science
Eötvös University, Budapest, Hungary
Eötvös Loránd Tudományegyetem
Földrajz- és Földtudományi Intézet
1117 Budapest, Pázmány Péter sétány 1/A

2. Overview: Geo-reference of historical regional maps
Guess of the projection and projection parameters
Geo-reference using latitude and longitude lines, then the local projection
Export to Google Earth
A real difficult example: the Lazarus map of 1528

3. Try this: an old map of the historical Hungary
Goetz & Probst, 1804

4. Try this: an old map of the historical Hungary
Meridians: lines to a common pole; prime meridian: Ferro

5. Try this: an old map of the historical Hungary
Parallels: mostly invisible but assumed to be concentric circles

6. Try this: an old map of the historical Hungary

7. Try this: an old map of the historical Hungary

8. Try this: an old map of the historical Hungary
Standard parallel: from the meridian angles of the map Central meridian: the vertical one Origin latitude: not important 

9. Try this: an old map of the historical Hungary
Projection! GCPs should be converted into the real map projection

10. Try this: an old map of the historical Hungary
Google Earth needs to reproject the map to WGS84/GEOGRAPHIC system...

11. Try this: an old map of the historical Hungary
Google Earth needs to reproject the map to WGS84/GEOGRAPHIC system...
and...

12. Try this: an old map of the historical Hungary

13. A new blog to be launched: http://oldmapsingis.blogspot.com

14. A much more harder target: Lazarus (1528)
600 GCPs from all around the map

15. „Brute force” way
Linear fit to UTM33

16. „Brute force” way
Quadratic fit to UTM33

17. „Brute force” way
Cubic fit to UTM33

18. Ptolemian point list

19. Ptolemian projection... To be defined in GIS

20. The geo-referred map... Really?

21. Latitude-longitude grid

22. Coastlines and rivers

23. Geo-reference
How to choose the standard parallel in the Equidistant Conic (Ptolemian) projection: false selection (left), correct selection (right)

24. Thanks for the attention