Modeling the data

The Data

• A panchromatic, 10m resolution, SPOT 3 satellite image.
  

• A road map in which each road section is represented by a straight segment.
  

Modeling

The network is modeled by a graph such that :

• The nodes are network characteristic points (crossroads, orientation changing points),
• Each node descriptor is its position,
• The edges are the roads joining those points.

The edges of the road network graph represent the roads.

=> We compute the possible road modeled by an edge on the SPOT image.

The estimated position of a road section only depends on its extremity nodes position.

=>We try to registrate the network moving the nodes only.