Geospatial Technologies in Transportation

Street Map Error
 

Three digital centreline maps (A, C and E) of the same road.

Differential GPS survey (red) verifies that database C is most accurate.
Database A has highly generalized linework, but is relatively true, within 50 metres.
Database E has spuriously smooth arcs, but positions are in error by up to 200 metres.

Illustration from DGRC project at NCGIA, University of California, Santa Barbara


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