CI PA 2005 XX Internationa/ Symposium. 26 September - 01 October. 2005. Torino. Italy 
photogrammetric DEM information was first integrated with the 
canal section surveys; this operation was repeated using the 
canal section restoration projects. Two DTMs were obtained: 
one about the actual Park situation and one about the planned 
situation. Using raster calculator functionalities in the CIS 
environment, it was possible to map the DTM differences and to 
evaluate the excavation and filling volumes, and the consequent 
expected costs. 
Figure 9. GIS aid in the historical analysis phase 
Figure 10. Image of the differences between the two present and 
planned Park configuration DTMs. 
3.4 The monitoring 
A suitable database was set up to deal with the monitoring of 
the hydraulic system. It was planned to store the section 
drawings of the project and of the periodic control surveys. The 
control-sections were materialized and their planimetry inserted 
into the GIS. These sections were linked to the project and the 
monitoring data were stored in the database. By selecting the 
planimetric section it is possible to have access to all the 
available information on it, and therefore have access to the 
desired data. 
Figure 10. Monitoring of the hydraulic system in the GIS: a link 
between the planimetry of the control-sections and the surveys. 
Beside the normal GIS tool, a personalized application of the 
software environment was developed for the monitoring. A 
specific toolbar was created for this application using Visual 
Basic when the GIS platform is ESR1 ArcGIS. First of all it 
offers the user the chance to select a desired survey section and 
to calculate the area of that section, from a text file that contains 
the geometric information of the section. Then the area of the 
design-section is calculated and a comparison is made between 
the two situations: the user is supplied with the excavation and 
filling areas. In this way, it is easy to estimate the need for 
punctual interventions. This procedure can also be used to 
evaluate the amount of material that has to be moved: starting 
from the area of each section, the tool is able to automatically 
calculate the excavation/filling volume in the part of the canal 
between the chosen section and the following one (according to 
a predefined direction). The Torricelli formula is used for 
sections without sharp variations [1]. 
V - d * 
F. + F, 
[1] 
where: Fj, F 2 are the two sections that limit the considered 
part of the canal 
The tool can be applied in the most general cases where two 
sections have different excavation trends. 
4. CONCLUSIONS 
The cooperation between the Politecnico di Torino Geomatics 
Research group and the Architecture and Landscape Safeguard 
Office in Piedmont has led to the accurate knowledge of the 
geometries of the Royal Racconigi Park. A stable Reference 
Network has been created and surveyed, and will represent a 
base for all future surveys. This geometric knowledge concerns 
the Park map, orthophoto and DEM. The building of a GIS 
made it possible to create a valid management and analysis tool. 
This tool was used in the hydraulic planning of the 
interventions: it was useful to georeference a historical map and 
also to interpret data of the excavation documents. It was 
therefore possible to have a historically correct restoration plan. 
The GIS environment was also useful in the monitoring of the 
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