| () Input taxicabs GPS data after cleaning |
| () Using transformation, the format of raw taxicabs GPS records is |
| converted to (plate number, (date and time; marked region; status bit)) |
| () Using groupByKey transformation, all the taxicabs GPS data of the same |
| plate number are gathered. |
| () if (Using transformation, we inspect and detect if there are |
| real-time taxicabs in Wander Status) |
| |
| () Using transformation, we calculate the distance between |
| these real-time taxicabs and . Then, (corresponding distance, |
| plate number) are exported. |
| () Ascending order of corresponding distance can be obtained by |
| (true) transformation. |
| () Using take(1) operation, we obtain and recommend the nearest |
| taxicab in Wander Status to the passenger . |
| |
| () else |
| |
| () Using transformation, we inspect and detect if there are |
| real-time taxicabs in Occupied Status. |
| () Using transformation, GPS data for each taxicab are |
| arranged in reverse chronological order. Then, we output plate |
| number and the corresponding last manned trajectory, namely, |
| several continuous GPS records in which the status bit is 1. |
| |
