Symbology Consistency Checker
Checks map legend symbols, colours and line styles for consistency, contrast and colour-blind readability.
Checklist
Check that a map or GIS layout uses symbology consistently — the same feature always looks the same, and the legend matches the map.
Still outstanding
- Each feature type has one consistent symbol
- Colours used consistently and meaningfully
- Line styles and weights consistent
- Point marker sizes sensible and uniform
- Every map symbol appears in the legend
- No legend entries that aren't on the map
- Labels match the legend wording
- Colour-blind-safe palette
- Sufficient contrast against the base
- Symbols distinguishable at the print scale
A field and study aid only — follow your organisation's procedures, project brief and QA requirements. Nothing here is stored.
How to use this calculator
- Tick the consistency, legend-match and readability items as you confirm them on your map.
- Use the outstanding list to find symbols that don't match or aren't in the legend.
- Fix every item before you finalise the map.
How it works
A readable map uses one consistent symbol per feature type, applies colour meaningfully, and has a legend that matches the map exactly — nothing on the map missing from the legend, and nothing in the legend missing from the map.
This is a browser-only QA aid for study and design exercises.
Worked example
A services map. Water is always one blue line weight, sewer always another, every symbol appears in the legend, and the palette stays distinguishable for colour-blind readers at the print scale.
Frequently asked questions
Why does symbology consistency matter so much?
If the same feature looks different in two places, or the legend doesn't match the map, readers misinterpret it. Consistency is what makes a map trustworthy at a glance.
Is this official course material?
No. It is free study support mapped to surveying course levels — not official North Metropolitan TAFE content or advice. Always follow your lecturer and the official assessment brief, and check your own working.
Related tools
- Basic Map Layout Checker
- Map Purpose and Audience Checklist
- Thematic Map Class Break Helper
- Attribute Table Completeness Checker
- CAD Layer Naming Checklist
- Map Scale from Known Distance Checker
Explore more in Surveying, Coordinates, GIS & CAD.
Cite this tool
Zerdly. (2026). Symbology Consistency Checker. Retrieved from https://www.zerdly.com/tools/symbology-consistency-checker/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.