Preparing Maps for Adobe Illustrator

Adapting Cartographic Vector Data for Graphic Design Environments

Professional vector maps intended for design workflows require additional preparation before use in Adobe Illustrator. Geographic datasets originate from GIS-oriented structures, which must be transformed into stable, editable, and performance-optimized vector files suitable for graphic production.

This article outlines the key steps in preparing cartographic data for Illustrator-based workflows.

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1. Geometry Optimization

GIS data often contains excessive vertex density and analytical structures that are unnecessary for design. Preparation includes:

• simplification of paths

• removal of redundant vertices

• ensuring continuous lines and closed polygons

• elimination of micro-segments

This improves performance and file stability.

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2. Layer Structure Adaptation

Layers are reorganized according to visual logic rather than GIS structure:

• road classifications separated

• hydrography structured by type

• boundaries grouped hierarchically

• text elements separated from geometry

Clear layer structure supports editing and styling.

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3. Attribute Data Reduction

GIS attribute tables contain analytical information not required in design workflows. During preparation:

• unnecessary attributes are removed

• geometries are converted into clean vector paths

• design-relevant properties are preserved

This reduces file complexity.

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4. Text Handling

Geographic labels may originate as GIS annotations. For Illustrator workflows:

• text objects are preserved as editable text when possible

• outlines may be created for compatibility when needed

• label layers are kept separate for easier editing

Text handling ensures flexibility for designers.

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5. Coordinate and Projection Considerations

Spatial data is prepared in coordinate systems compatible with Illustrator’s vector environment. Preparation ensures:

• consistent scaling

• correct spatial relationships

• predictable behavior in layout workflows

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6. File Format Stability for Large Maps

Large and geometry-dense maps require special attention to file format compatibility.

For high-complexity maps, saving in Adobe Illustrator 10 format often provides the most stable behavior across workflows. This format:

• handles large path counts reliably

• reduces compatibility issues

• minimizes file corruption risks in complex vector structures

Text updates and advanced formatting can be applied later if required, but the base cartographic structure remains more stable in this format.

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7. Performance Considerations

Large maps may contain millions of vector segments. Preparation includes:

• path optimization

• layer organization

• minimizing unnecessary compound paths

• balancing detail and performance

These steps ensure smoother editing and rendering.

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8. Final Quality Control

Before delivery, files are reviewed to ensure:

• correct layer structure

• absence of topology artifacts

• stable behavior in Illustrator

• consistent visual hierarchy

Manual review complements automated preparation.

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Summary

Preparing maps for Adobe Illustrator involves geometry optimization, layer restructuring, attribute reduction, and format compatibility adjustments. For complex cartographic datasets, using stable file formats and separating structural preparation from later text refinement ensures reliability in professional design workflows.

This stage transforms geographic data into production-ready vector map assets.

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Note: The recommendations for working with the LARGE vector maps:
You need a powerful computer in order to work with large map files.
Also: There are some simple tricks to work with large map files in Adobe Illustrator.
1. Try to reduce the color resolution of the video card (display) to 256 colors while you are working with a large map.
2. Select all programs that you do not need on your computer at the time when you work with map and turn off these.
3. Start Adobe Illustrator or PDF Editor (for example, Acrobat) or CorelDraw. (NOT OPEN FILE) TURN OFF Anti-Alias: Before open file – OPEN TOP MENU – Edit -> settings -> main settings -> turn off anti-alias. /// Look ugly = work quickly)))
4. Start Windows Task manager (Activity Monitor in MAC systems) -> administrator rights -> process “Illustrator or Acrobat” -> set the priority “real time” or “high”
5. Open file, When you see LEGACY FONT pop-up window – click OK (not renew!!!). You can renew the TEXT later.
6. We recommend that you save the file in version 10 of Adobe Illustrator. It is much more stable when working with VERY LARGE files.