Cadastral Surveying and Mapping

1
Cadastral Surveying and Mapping

• Technology Options

Department of Geomatics The University of
Melbourne
451-418 Land Administration 451-607 Land
Administration
Daniel Steudler March 2001
2
Role of Data Acquisition
Tools
Products
DataAdministration
DataAcquisition
plans
Cartography
Real world on the ground
Data base
Measure-ments
maps
x, y
GIS
analysis
CAD
..
..
3
Which Method ?

• Control points
• low cost, low precision, small area ?
• low precision, large areas ?
• high precision, small areas ?
• high precision, large areas ?
• Cadastral Surveying
• low cost, low precision, but quick ?
• high precision, small areas ?
• high precision, large areas ?

• DTMs
• Land cover
• Upgrading

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Role of Precision
5
Graphical Methods

• plane table
• orthometric method
• photogrammetry

6
Numerical Methods

• polar method (theodolites, tapes, EDM)
• photogrammetry
• GPS
• orthophotomaps
• digitizing, scanning
• laser or radar scanning

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Reduction of Control Points
Old No. of pts Density Responsibility 1st
order 50 30-50 km Federal 2nd order 150 10-20
km Federal 3rd order 4500 5-15 km Federal 4th
order 67000 2-4 pt/km2 Cantons Traverse 5
million 50-100 m Community In terms of
separation between two points New No. of
pts Density Responsibility LFP1 150 Federal LFP
2 1.5 pt/km2 Cantons LFP3 2-150
pt/km2 Community
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Technical standards in Swiss cad. surveying
Since
Designation
Technical characteristics
Legal force
Digital, data model, layer principle, topology
Official Sur-veying 1993
Digital Data
AV93
1993
Transitional standard, does not fulfill all
requirements of AV93
Provisionally digitised
Paper maps
PN
1993
Completely numerical
Paper maps
Digital, attributes
VN
1985
Partial numerical
Paper maps
List of Co-ordinates
TN
1970
Traverse points with calculated co-ordinates,
co-ordinatograph
Semi-graphic
Paper maps
HG
1912
Paper maps
Plain table
GR
1850
Graphic
Provisionally approved
Paper maps
Plain table
pa
1850
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Evolving Standards
Standards
AV93
PN
VN
TN
HG
GR
1850
1912
1970
End 1970s
1985
1993
2000
Time
1930s
First Surveys
Renovations
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Coverage of "Cadastral Map"
Date Jan. 2000
Standard
appro- ved
in pro- gress
AV93
6
(13)
PN
4
(3)
VN
6
TN
18
HG
23
GR
7
prov. appr.
13
still to survey
19
glacier
1
lakes
3
100
11
DOP1
12
DOP2