mapsf Mapping Cheat Sheet
An R mapsf reference for static thematic maps, classified colors, proportional and category symbols, labels, legends and layout output.
What this reference covers
mapsf is suited to static thematic maps for reports and print. This reference covers classified colors, proportional symbols, category symbols, labels, legends, scale bars, north indicators and layout elements that help readers connect a visual encoding to a variable.
Verify geometry and projection first
Check geometry type, coordinate reference, extent and key attributes with a small boundary or point map. Projection affects distance, area, direction and shape, so a visually plausible map still needs a coordinate check before comparison.
Make the legend explain the data
Use classified colors or proportional symbols for continuous values and category symbols for discrete groups. Record breaks, units, time and missing-value treatment. Add boundaries, labels and scale elements after the main encoding is readable, not before.
Maintenance note
Static maps should be reviewed at report and print sizes for fine lines, pale colors, small type and crowded labels. Content review date: 2026-08-23.
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mapsf thematic mapping study guide
Validate spatial objects and projection, choose one clear visual encoding, add supporting layout elements and review the map at its final output size.
Before you start
- Prepare a PDF reader and point, line or polygon data with a documented coordinate reference.
- Define the main variable, its unit, time point and intended audience.
- Choose report, web or print dimensions before final styling.
Quick start
- 01
Validate the spatial object
Check geometry, coordinate system, extent and key fields, then draw a minimal boundary or point map to confirm position.
- 02
Select thematic encoding
Use classified color or proportional symbols for continuous values and categorical color or symbols for discrete groups.
- 03
Set layers and layout
Organize background, main map, boundaries, labels, scale and direction so supporting elements do not cover the main message.
- 04
Check and export
Review color, type, legend, projection and boundaries at report and print sizes, then preserve breaks, script and output version.
Usage tips
- Record classification breaks so maps remain comparable over time.
- Use the title and legend to state variable, unit, time point and missing-value treatment.
- Check pale areas, fine lines and small type in grayscale or reduced-size output.
Troubleshooting and uninstall
Why are map layers misaligned?
Compare coordinate references and units, transform them consistently and inspect a minimal pair before changing the plot extent.
Why is a classified map hard to explain?
Reduce categories, use a meaningful color sequence and state class, unit, time and missing values in the legend.
Frequently asked questions
What scenarios does mapsf support?
It supports static thematic maps, report figures and print maps with classified colors, proportional and category symbols, labels and layout elements.
How should classified colors and proportional symbols be chosen?
Classified color works for value ranges across areas or objects, while proportional symbols emphasize quantity; map scale and overlap also matter.
Why check projection before exporting?
Projection affects distance, area, direction and shape, so an unsuitable or inconsistent projection can distort visual comparison.
What should a static map label?
Usually include title, variable and unit, time, legend, scale, direction, source and missing-value notes as appropriate for the use.