| 主权项 |
1. A method for indexing map data, the method comprising:
from a set of received trajectory points, determining, by one or more computer processors, whether each received trajectory point from the set of received trajectory points is associated with a road link of a map, wherein data associated with the set of received trajectory points comprises: a moving object identification, a timestamp of a moving object, a longitude coordinate and a latitude coordinate of the data, a spatial cell identification, and a distance; building, by one or more processors, from the set of received trajectory points, a hybrid index, wherein the hybrid index comprises spatial cells, and wherein the spatial cells comprise a road link or a grid cell, wherein the grid cell represents a missing road link of the map; creating one or more bundled spatial cell by combining, by one or more processors, at least one grid cell to form a bundled grid cell and more than one road links to form a bundled road link, wherein a size of the hybrid index data is less than a size of the set of received trajectory points, and wherein an equivalent trajectory density is represented in each bundled spatial cell; forming a trajectory segment with identification based on the one or more bundled spatial cells; responsive to building the hybrid index, inputting, by one or more processors, a set of information into a trajectory hybrid indexing module, wherein the set of information comprises: moving object (MO) identification, a spatial cell identification, a start time, an end time, and a determined trajectory segment identification; receiving, by one or more processors, a query for an area of the map, based on the bundled spatial cell, comprising:
identifying, by one or more processors, each area represented by the bundled spatial cells which intersects with an area of the map represented by the query;scanning, by one or more processors, the area represented by the bundled spatial cells which intersects with the area of the map represented by the query;determining, by one or more processors, whether the intersecting bundled spatial cells are grid cells; andin response to determining that the intersecting bundled spatial cells are grid cells, executing, by one or more processors, a set of spatial related computations, wherein the set of spatial related computations comprise: determining, by a spatial computing engine, an intersection between the grid cells, using data associated with the received set of trajectory points;returning, by one or more processors, results from the set of spatial related computations, based on the received query; and updating, by one or more processors, during runtime, the bundled spatial cell, based, at least in part, on a trajectory pattern and the trajectory density. |
