A postgis-based online traffic flow cobweb graph generation method
A technology of traffic flow and cobweb graph, applied in the field of traffic information, can solve the problems of unable to monitor the characteristics of urban traffic situation changes online for a long time, unable to share, complex operation, etc., and achieve fast execution mode and calculation efficiency, simple steps, and simple operation Effect
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[0035] Specific implementation mode one: refer to Figure 1 to Figure 2 , illustrate the present embodiment, a kind of online traffic flow cobweb diagram generation method based on PostGIS of the present embodiment, concrete steps are:
[0036] Step 1. According to the distribution requirements of the traffic trips, the trips OD and the area vector shp layer are stored in the database;
[0037] According to the distribution requirements of traffic trips, the area vector shp layer data is stored in the PostGIS database to generate spatial data, which has a geom (geometric field type) field, and the polygon_shp table is generated in the database.
[0038] According to the distribution requirements of traffic trips, the travel volume OD is stored in the PostgreSQL database, and the OD_table table is generated in the database. Table 1 is the OD_table sample data table.
[0039] surface od_table sample data
[0040]
[0041] Step 2, generating buffers for each planar vecto...
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