A WebGIS · 2026

Coastal lagoons
of Earth

A WebGIS of the world's coastal lagoons — their geomorphology, location, and projected vulnerability to sea-level rise under IPCC climate scenarios.

Sites mapped 125

Regions covered Greece

An interactive Web GIS for the coastal lagoons of Greece — explore each lagoon's morphometry and its projected exposure to sea-level rise under two IPCC AR6 climate scenarios.

What you can do here

Browse all 152 lagoons on the map; click any marker for a detail card with a mini-map of the polygon.
Filter by location, island, or projected inundation status; combine filters with a SQL-style query builder.
Open the Statistics tab to see the distribution of any variable across the currently visible set, with histograms, summary statistics, and bar-by-bar drill-down.
Search by name, location, or island; submit corrections or new records via the footer links.

Climate scenarios (IPCC AR6)

Code	Name	What it means
SSP1-2.6	Low emissions	Sustainability pathway with strong mitigation; warming kept below ~2 °C by 2100.
SSP5-8.5	High emissions	Fossil-fuelled development; limited mitigation, warming ~4–5 °C by 2100.

Sea-level rise & vertical land motion

Term	Meaning
SLR	Projected sea-level rise (m) by 2100 under the chosen climate scenario.
VLM	Vertical Land Motion — local subsidence or uplift of the coast. Adding VLM to climate-driven SLR gives a more realistic estimate of the relative sea-level change a specific lagoon will experience.
geocentric	SLR taken straight from the climate model, with no local land-motion correction.
VLM-corrected	SLR adjusted for local subsidence or uplift. Available where InSAR-grade VLM observations exist (~55 % of lagoons).
(SSP-based)	On the inundation column, marks records where no local VLM was available, so the geocentric SSP outcome was used as a fallback.

Morphometry

Field	Meaning
Area	Polygon area (km²).
Perimeter	Polygon perimeter (km).
Length / Width	Maximum lengths along principal axes (m).
Sandspit max height	Highest elevation along the lagoon-enclosing barrier (m above MSL).

How to read each value shown in the panel. All statistics are computed on the lagoons currently visible (after filters and SQL queries).

Numeric variables

Symbol	Name	Definition
n	Sample size	Count of lagoons with a value.
μ	Mean	Arithmetic average; sum divided by n.
med	Median	50th percentile; half the values fall below, half above.
σ	Std. dev.	Sample standard deviation; typical distance of a value from the mean.
min / max	Extrema	Smallest and largest observed values.
range	Range	max − min.
Q1, Q3	Quartiles	25th and 75th percentiles; the middle 50% of the data lies between them.
IQR	Interquartile range	Q3 − Q1; a measure of spread.
g₁	Skewness	Asymmetry; 0 ≈ symmetric; positive ≈ long right tail. \|g₁\| > 1.5 auto-switches the histogram to log scale.

Categorical variables

Symbol	Name	Definition
n	Sample size	Count of lagoons with a value.
unique	Unique values	Number of distinct categories present.
mode	Mode	Most frequent value, with its count and share of n.

Plot conventions

Histogram bars: bin counts. Click a bar to list the lagoons in that range.
μ, med: vertical reference lines at mean and median.
Log scale: applied automatically to heavily right-skewed variables (|g₁| > 1.5).
Frequency bars: count of records per category, sorted descending. Click a bar to list its lagoons.

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