In road navigation applications, thematic maps are often required to display road traffic conditions - green for smooth flow, yellow for slow traffic, and red for congestion. When viewing maps at larger map scales, main roads, auxiliary roads, and ramps are typically displayed separately. This can be achieved by creating a unique value thematic map based on select fields reflecting congestion levels in road data. At smaller scales where roads are generally displayed as bidirectional without showing auxiliary lanes or ramp conditions, offset processing is necessary for road lines to avoid overlapping when displaying congestion status for both directions of main roads.
This example uses Navinfo data to demonstrate how to create real-time traffic condition maps. The case study applies specifically to Navinfo data. The content includes two main sections:
Create a Traffic Condition Map