Accuracy research of the map Sclavonia, Croatia, Bosnia cum Dalmatiae parte by G. Mercator · 2012....
Transcript of Accuracy research of the map Sclavonia, Croatia, Bosnia cum Dalmatiae parte by G. Mercator · 2012....
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Accuracy research of the map Sclavonia,
Croatia, Bosnia cum Dalmatiae parte by
G. Mercator
Marina Rajaković, Ivka Kljajić, Miljenko Lapaine
Faculty of Geodesy, University of Zagreb
Spatial Data Infrastructure Days
8th Cartography and Geoinformation Conference
Zagreb, September 28, 2012
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Content
o Introduction
• About the Map Sclavonia, Croatia, Bosnia cum
Dalmatiae parte
o Accuracy analysis of the map in program MapAnalyst
• Selection of identical points
• Type of transformations
• Distortion grid
• Displacement vectors
• Isolines of scale and rotation
o Instead of Conclusion
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Introduction
Gerard Mercator
(1512 –1594)
MapAnalyst
The Map Historian's Tool for
the Analysis of Old Maps
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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A map Sclavonia, Croatia, Bosnia cum Dalmatiae parte
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Accuracy analysis of the map
Selection of identical points
A segment of OpenStreetMap used for the analysis
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A segment of a general geographic map used for the analysis
Selection of identical points
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Helmert
transformation
(4 parameters)
Affine
transformation
(5 parameters)
Affine
transformation
(6 parameters)
Robust
Helmert
transformation
(Huber
estimator)
Robust
Helmert
transformation
(V estimator)
Robust
Helmert
transformation
(Hampel
estimator)
Standard
deviation in
destination
map [m] OSM
28 351,682 28 412,251 14 014,132 10 272,338 9 306,904 9 862,108
General
geographic
map
28 375,317 28 470,125 13 953,284 10 218,549 9 414,672 10 695,471
Standard
deviation in
source map
[m]
OSM
0,029 0,029 0,015 0,011 0,010 0,011
General
geographic
map
0,029 0,029 0,015 0,011 0,010 0,012
Type of transformations - comparison
Accuracy analysis of the map
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Helmert
transformation
(4 parameters)
Affine
transformation
(5 parameters)
Affine
transformation
(6 parameters)
Robust
Helmert
transformation
(Huber
estimator)
Robust
Helmert
transformation
(V estimator)
Robust
Helmert
transformation
(Hampel
estimator)
Root mean
square position
error in
destination map
[m] OSM
40 095,333 40 180,991 19 818,975 14 527,279 13 161,950 13 947,126
General
geographic map 40 128,758 40 262,837 19 732,923 14 451,211 13 314,356 15 125,680
Root mean
square position
error in source
map [m]
OSM
0,041 0,041 0,021 0,016 0,014 0,015
General
geographic map 0,041 0,041 0,021 0,016 0,015 0,017
Number of
identical points
OSM
82 82 69 56 54 55
General
geographic map 82 82 69 56 54 56
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Accuracy analysis of the map
Reference maps
• OpenStreetMap
• General geographic map at the scale 1:1 000 000 in a
modified polyconic projection with the ellipsoid adapted
for the international map of the world
• An example – affine transformation with 6 parameters
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Accuracy analysis of the map
Distortion grid
• Meshes of a distortion grid, with the size 10 000 × 10 000
meters, reflect the local deformation and rotation of
Mercator’s map.
• OpenSteetMap – rotation 13°, scale 1: 950 000
• General geographic map – rotation 14°, scale 1: 948 000
• Calculated scale – 1:925 000
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Distortion grid – OpenStreetMap
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Distortion grid – General geographic map
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Accuracy analysis of the map
Displacement vectors
• Each vector line starts at a point previously identified in
the old map and ends at the position where the point
would be if the old map was as accurate as modern
reference map.
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Displacement vectors - OpenStreetMap Location
Correction [cm]
Mercator’s
map
Medak 0,3
Karlobag 0,3
Šibenik 0,3
Pag 0,4
Drniš 0,4
Silba 0,6
Makarska 0,7
Location
Correction [cm]
Mercator’s
map
Slatina 4,4
Mostar 4,3
Imotski 3,5
Šabac 3,4
Blagaj 3,3
Stara Gradiška 3,3
Našice 3,1
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Displacement vectors - General geographic map
Location
Correction [cm]
Mercator’s
map
Medak 0,3
Karlobag 0,4
Šibenik 0,4
Pag 0,4
Drniš 0,4
Silba 0,6
Makarska 0,7
Location
Correction [cm]
Mercator’s
map
Mostar 4,4
Slatina 4,3
Imotski 3,6
Blagaj 3,4
Šabac 3,3
Našice 3,2
Stara Gradiška 3,2
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Accuracy analysis of the map
Isolines of scale and rotation
• New means of visualizing local varitions
• Connect points of constant scale or rotation
• Illustrate how scale and rotation locally change in
the map
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Isolines of scale - OpenStreetMap
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Isolines of scale - General geographic map
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Isolines of rotation - OpenStreetMap
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Isolines of rotation - General geographic map
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Instead of Conclusion
• It would be necessary to perform further tests to
verify if this example with affine 6 parameters
transformation is valid.
• Probably, none of selected factors would
considerably influence the result of the cartometric
analyses.
• A map projection of Mercator’s map?
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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19,4
19,6
19,8
20,0
20,2
20,4
20,6
44,0 44,1 44,2 44,3 44,4 44,5 45,0 45,1 45,2 45,3 45,4 45,5 46,0 46,1 46,2 46,3 46,4 46,5
[mm]
[°]
west
east
Differences between west and east scale of the map
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012
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Thank you for attention!
SDI Days, 8th Cartography and Geoinformation Conference, Zagreb, September 28, 2012