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difficulties of transfer of information from one system to 
the other), today it is absolutely preferable to impose 
the new territorial sampling system WGS84. 
Road cadastre, therefore, should be set in a system 
determined by G.P.S. and referred to a “global” WGS84 
system, even if it could be more immediate and simple 
to set it in a network of vertices referred to the “local” 
ellipsoid of the current national cartography and to the 
diffused technical compensating maps (regional, 
provincial, communal). 
Road cadastre should then be set in the WGS84 
network, no matter who produces it. 
The elements of the Road cadastre, therefore, even if 
they can be deduced from the existing cartography, 
must be collected with measuring campaigns that are 
ad hoc (land or satellite methods) always with the 
support of the WGS84 network. 
The information structure of the Road cadastre must 
allow the up-dating of the geographic co-ordinates and 
the plain co-ordinates of its elements without changing 
or introducing other data. This allows the up-dating of 
the database increasing the precision of the localization 
based on the improvement of the cartography of the 
country and the progress in the technology of sampling. 
Table 1 - Objectives with the creation of the road cadastre and fields of action for road managers in order to carry them out. 
GENERAL OBJECTIVES 
SPECIFIC OBJECTIVES 
ACTIONS 
SAFETY AND COMFORT 
□ Lower accident rate 
□ Road traffic quality 
□ Mobility of emergency vehicles in 
case of disasters 
□ Timeliness of maintenance 
□ Acceptable quality of life with 
benefits for health 
□ Planning infrastructural action 
□ Routing for exceptional vehicles 
and loads 
□ Research into preferential routes 
□ Simulation of emergency plans 
□ User information on road use. 
□ Identification of traffic loads for 
different typologies of road 
□ Atmospheric and acoustic 
pollution control 
TRAFFIC PLANNING AND 
MANAGEMENT 
□ projects and works progress 
(planned, under contract, in 
progress) 
□ Search for preferential routes 
□ Impact of new sections 
□ Monitoring 
□ Routing for exceptional vehicles 
and loads 
□ simulation analysis 
OPTIMIZATION OF MANAGEMENT 
AND MAINTENACE COSTS 
□ programmed maintenance 
□ projects and works progress 
(planned, under contract, In 
progress) 
□ Setting up of inspection systems 
for pavements and works 
□ simulation analysis 
□ Cost-benefit analysis 
□ Multi-criteria analysis 
2.2 Cartographic elements to be included in the 
Road cadastre 
The elements to include in the Road cadastre can, in 
part, be already represented on existing maps. For this 
purpose, in the case of up-dating or making new maps 
it would be appropriate to stipulate in the works contract 
the surveying and organization of the data relative to 
the road and rail infrastructure so as to make a base for 
the Road Information System (L. Leone, G. Mussumeci, 
1996). 
The objects that can not be deduced from the maps 
with sufficient precision must be surveyed with 
adequate methods. 
2.2.1. Methodology for cartographic data 
acquisition 
The elements of the Road cadastre can be surveyed 
and acquired according to the following techniques: 
■ Digitalization of cadastral maps that satisfies the 
conditions of national network and eventual other 
official networks connected to them. 
■ Digitalization of existing large scale technical maps 
of the national networks; the co-ordinates of the 
database of points will then be cartographic in the 
national system; 
■ Procedure of land triangulation, trilateralisation, 
and polygonisation from well-known points. 
■ Geodetic satellite procedure from GPS vertices 
referred to WGS84; 
■ Integrated inertial and kinematic satellite 
procedures, that is by means of trajectory 
representation of a vehicle with these systems; 
today it is based on GPS and inertial navigators, 
INS, of various types. The co-ordinates that are 
determined with these instruments are originally 
ellipsoidal geographic in the WGS84 system and 
thus, to carry out the superimposition of the 
existing national or European maps, it is necessary 
to transform them. 
■ Photogrammetry, this must take place using the 
support points linked to the WGS84 system. 
2.2.2. Cartographic structure of the Road cadastre 
The basic geometric structure of the Road cadastre is 
the network of the road axes, which can in part be 
deduced and geo-referenced with respect to the 
national geodetic network, but which must be supported 
by vertices networks determined by GPS for the geo- 
referencing in the global WGS84 network.