Projection comparison generator

Projection comparison

Compare named projections or projection diagnostics on a common horizontal scale before choosing a map treatment. Create a private, publication-ready projection comparison directly in your browser without transmitting sensitive rows off-device. Data is processed locally on your hardware with zero server uploads, enabling instant export to SVG, PNG, and Excel data.

Compositionmapsprojectionsgeography

Edit the data, then export.

Everything runs in your browser. Your data is not uploaded.

Data

Paste tab-separated data from Excel or edit the cells directly.

Paste or import table data

Paste a header row, or choose a local CSV/TSV file. Files are read in this browser and capped at 500 rows.

Choose CSV/TSV

Appearance

Chart title

Palette

Width Data labels Gridlines Axes LegendBackground

Preview

Sample preview of the example data. The live chart takes over as soon as you start working.

SVG, PNG, and Excel exports are generated locally in this browser. PowerPoint export is temporarily unavailable while its dependency path is reviewed for a high-severity image parser advisory.

Part-to-Whole Composition Mechanics

A projection comparison tool interactively contrasts different mathematical cartographic map projections (like Mercator, Equal Earth, or Robinson), demonstrating how each transforms geographic area and shape distortion. By visualizing the Tissot indicatrix (a mathematical tool used to characterize local distortions due to map projection) or simply displaying landmasses side-by-side, users can evaluate the trade-offs of flattening a globe onto a 2D plane. All projection rendering and diagnostic calculations are processed locally on your device, ensuring complete data privacy with no server uploads.

Categorical Proportions & Table Structure

Format input columns for projection comparison with explicit headers and numerical measurements. Verify that rows represent discrete categories or observations without unformatted symbol artifacts.

Sample Part-to-Whole Proportions

| Projection | Area distortion | Angular distortion |

Segment Allocation Guidelines & Pitfalls

Ensure sufficient visual distinction for projection comparison marks across standard and high-contrast viewports.
Align text labels horizontally whenever possible to improve cognitive readability for projection comparison elements.
Double-check scale boundaries and zero-anchors before exporting projection comparison presentation artwork.

Data shape: Projection label and two diagnostic value columns
Exports: SVG, PNG, and Excel data; PowerPoint export is temporarily unavailable pending dependency review.

How it works

You edit a table in this page. The renderer draws an SVG from those rows in your browser, then you can download SVG, PNG, or Excel data. The table is not uploaded to any external processing server.

Frequently asked questions

Why is the Mercator projection misleading for thematic data?

Mercator exaggerates the size of landmasses near the poles (making Greenland look as large as Africa, when Africa is actually 14x larger).

Color schemesCompare category colors and their relative emphasis before applying a palette to a chart.Open Donut chartShow part-to-whole relationships with a hollow center.Open Marimekko chartShow part-to-whole relationships across two variables where both width and height hold data.Open Pie chartSlice a circle into radial sectors proportional to the data.Open Radial stacked bar chartCompare category totals around a circle while preserving each total's component breakdown.Open Word cloudShow the relative prominence of words or labels with a compact, browser-generated text layout.Open

Reviewed 16 August 2026.

Projection comparison generator