The SIG or the "Geographic Information Service"

The "SIG" is a tool where geographic information of a territory is stored in form of vector data and raster data in order to render their consultation easy.

The vector data arise from the digitalisation of the local development plan, the water, waste water and rain water network etc…

The raster data arise from the digitalisation of serial photographs, land register (graphics) ortho-photographs.

With its SIG the CCG has a new development tool that offers the communes an essential instrument for their urban development projects.

The SIG also allows a rapid updating and transmission of data as well as the creation of quality documents which may contain a large amount of information.

In order to put this system up one had to digitalise the land register of the 17 communes of the CCG and design a data base for information linked to each plot of land.

That work had been done together with the "Régie de Gestion des Données 73-74" and the service of the main tax office the "Direction Générale des Impôts (D.G.I.)".

The advantages of the SIG :

• It improves the service towards the users by the considerable reduction of processing times, decision-making and the attainment of documents.
• It allows a better knowledge of the patrimony of the collectivity.
• It helps taking decisions especially during the edition of maps for instance the state of networks, evolution of constructions etc…
• It lets you to consult different types of information at the same time, for example the land register and the local development program.
  

Raster data: this is a form of presentation of graphics: after digitalisation a graphic is turned into pixels, elements not visible. (example : Scan25 et Ortho-photographs, aerial photographs)

Vector data: this is a form of presentation where data are expressed as geometric entities in their specific coordinates (ex: drinking or waste water network, land register...)