Map With Legend Maker
Create a custom map legend with labels, colors, and a copyable configuration.
This free map legend maker lets you add labeled color classes, preview the legend, and copy a simple JSON configuration without uploading your map or data.
Build a clear legend locally for a map, report, or classroom graphic. No file or coordinate data is uploaded.
Map Legend
Map Legend Maker Technical Specifications & Standards
No geographic datum is required.
Standard global ellipsoidal coordinate reference system
Client-side Geodesics
Visual configuration only; class breaks and map data remain your responsibility.
GeoJSON · KML · CSV · SVG
Compatible with QGIS, ArcGIS, Google Earth & CAD
100% Client-Side
Calculations run in-browser. Zero coordinate logging.
How to Use the Map With Legend Maker
Follow this step-by-step procedure to execute precise spatial measurements and export results.
- 1Name the legend: Enter a title such as Population density or Risk level.
- 2Add labels and colors: Edit each class, choose its swatch color, and add or remove rows.
- 3Copy the configuration: Copy the JSON to document the visual categories used by your map.
Geodesic Precision vs. Competitor Mapping Approaches
Most legacy mapping utilities (such as CalcMaps and FreeMapTools) rely on planar Web Mercator projections or spherical approximations, causing significant mathematical distortion at higher latitudes. GeoMap Suite computes exact ellipsoidal geodesics on the WGS84 reference ellipsoid.
| Calculation Model | Mathematical Basis | Distortion on WGS84 | Standard Tools | Practical Application |
|---|---|---|---|---|
| Planar (Web Mercator) | Cartesian dx² + dy² | 10% to 200%+ error | CalcMaps / Simple map tools | Distorts drastically away from equator. Inaccurate for true distance. |
| Spherical Great-Circle | Haversine (R = 6,371 km) | Up to 0.5% (~5 km/1,000 km) | Basic Google Maps wrappers | Ignores Earth's polar flattening. Reasonable for rough estimates. |
| GeoMap Suite Ellipsoidal | Karney Direct/Inverse WGS84 | < 15 nanometers (<0.0001%) | GeoMap Suite | Geodetic surveying, maritime, flight paths & legal boundary analysis. |
Population map legend
A student needs three classes for a choropleth map.
Input Parameters
- Classes
- Low, Medium, High
- Colors
- Light blue to dark blue
Computed Outputs
- Result
- Reusable legend class configuration
Step-by-Step Mathematical Process
- Set a descriptive title.
- Edit each label and color.
- Copy the JSON configuration.
Understanding Your Results & Practical Interpretation
What the legend documents
Each row pairs a human-readable class label with a color swatch so readers can decode a map.
What it does not do
It does not classify features, calculate breaks, or modify GeoJSON. Use the output as a visual specification.
Practical Applications & Real-World Use Cases
Choropleth maps
Document low-to-high classes for a thematic map.
Reports and presentations
Create consistent legend labels before exporting a graphic.
Mathematical Methodology & Geodetic Accuracy
Client-side legend configuration
The legend is represented as an ordered list of labels and hexadecimal color swatches.
legend = { title, items: [{ label, color }] }Limitations & Boundary Conditions
- •The preview is not a full GIS map renderer.
- •Color choices should be checked for contrast and color-vision accessibility.
- •JSON export contains labels and colors, not geographic data.
Authoritative Reference Standards
Troubleshooting & Geographic Edge Cases
Why do colors look different on another display?
Screens and color profiles vary. Check contrast and print output before publishing.
Can this create a GIS style file?
It creates a simple JSON configuration, not a QGIS or ArcGIS style file.
Frequently Asked Questions
A map legend explains the symbols, colors, and categories used on a map.