Before revision:  Elaborate experiments based on real taxi trace data show that STC can commendably settle the incompleteness problem of vehicle crowdsensing data based travel speed estimation and ensure the accuracy of estimated travel speed  , in comparison with representative existing methods  .
After revision:  Elaborate experiments based on real taxi trace data show that STC can settle the incompleteness problem of vehicle crowdsensing data based travel speed estimation and ensure the accuracy of estimated travel speed , in comparison with representative existing methods .