15. The apparatus of claim 10 , the processors configured to: determine the plurality of association scores by: determining a plurality of candidate scores for a plurality of candidate vector pair combinations from the association scores, a candidate score indicating a likelihood that a candidate vector pair combination correctly maps the first features to the second features; and identify the plurality of same feature delta pairs by: identifying the same feature delta pairs according to the candidate scores.
10. An apparatus comprising: a memory configured to store a first sensor data set and a second sensor data set generated in response to sensing one or more structures, the sensor data sets describing a plurality of structural features of the structures; one or more processors coupled to the memory and configured to: generate a plurality of first delta vector sets for the first sensor data set and a plurality of second delta vector sets for the second sensor data set, each delta vector set comprising one or more delta vectors for a structural feature, a delta vector indicating one or more relative geometrical relationships between the structural feature and one or more other structural features of the each sensor data set; determine a plurality of association scores for a plurality of delta pairs, a delta pair comprising a first delta vector set and a second delta vector set; identify a plurality of same feature delta pairs according to the association scores, a same feature delta vector set comprising a delta pair corresponding to the same structural feature; and assign one or more first features of the first sensor data set to one or more second features of the second sensor data set according to the same feature delta pairs.