Tiled vector data model for the geographical features of symbolized maps.

Area of Science:

• Geographic Information Science
• Computer Graphics
• Cartography

Background:

• Web map services commonly use raster tiles, limiting interactive capabilities.
• Vector tiles offer superior interactivity for accessing and manipulating geographical features.
• Rendering symbolized vector tiles presents challenges like visual discontinuities and data loss at tile borders.

Purpose of the Study:

• To propose a tiled vector data model that addresses visual discontinuities in symbolized web maps.
• To enhance the rendering of geographical features on vector tiles without compromising interactivity.
• To ensure seamless visual continuity in web-based vector maps.

Main Methods:

• Developed a tiled vector data model considering relationships between geographical features, symbol representations, and map renderings.
• Implemented a method for tailoring geographical features using map symbols and 'addition' (join) operations at both geographical and map feature levels.
• Validated the model using two distinct map datasets.

Main Results:

• The proposed model effectively resolves visual discontinuity issues around tile borders.
• Rendered symbolized web maps exhibit smooth visual continuity.
• Interactivity of vector maps is preserved.

Conclusions:

• The novel tiled vector data model successfully overcomes the limitations of traditional vector tile rendering.
• This approach significantly improves the user experience for exploring interactive web maps.
• The model provides a robust solution for creating visually seamless and interactive online maps.