Several typical cases can occur:
M(0, 1) : One unmatched map section () section,M(1, 0) : One unmatched image section () section,
M(1, 1) : One section of matched with one section of ,
M(1, c) : One section of matched with several sections of ,
M(i, 1) : one section of matched with several sections of ,
M(i, c) : i sections of matched with c sections of .
The results are studied on sections namely between two road crossing (most important points of a road network).