Water Purification Data Coverage

This layer shows, cell by cell, which inputs of the Water Purification Loss layers are measured and which are filled.

Source: Chaplin-Kramer et al. 2019 (InVEST NDR), PFAS Data Hub Year: 2015-2026 Category: Scenario Format: Raster grid (COG), categorical Used in risk analysis: Context only. It is a coverage map and carries no shock or level.

What it shows

This layer tells you which of the two measured inputs of the Water Purification Loss layers exist at a cell: routed river nitrogen and measured PFAS. Where an input is missing, the loss layers fill it or leave it out. Use this layer to judge how much a water-purification figure rests on measured data.

How it is built

Each cell takes one of four values:

Value	Meaning
0	Neither input is measured
1	Routed nitrogen only
2	Measured PFAS only
3	Both

Routed nitrogen comes from the InVEST NDR outputs of Chaplin-Kramer et al. (2019). Measured PFAS comes from the PFAS Data Hub.

How to read it

Two gaps change what a water-purification figure means:

No routed nitrogen. This happens north of about 60° N, in dry or small coastal basins, and in the gaps of the Chaplin-Kramer data. There the loss is the contamination part alone, which stays under 0.3 points at the current weight K of the contamination term. Such a cell reads about twenty times lower than a comparable cell with nitrogen. The difference is a coverage effect.
No measured PFAS. PFAS is measured on 1.2 % of land cells, all in Europe. Everywhere else PFAS reads the European mean, 0.050. See the Water Purification Contamination Index.

Source

Chaplin-Kramer et al. (2019), Science 366:255, InVEST NDR outputs (Zenodo 21249617), licensed CC BY 4.0. PFAS Data Hub (CNRS, 2026); its licence is not confirmed.

Legend

Symbolised field: Data coverage

Value	Label	Colour
0	neither	`#d9d8d3`
1	routed N	`#74add1`
2	measured PFAS	`#fdae61`
3	both	`#1a9850`

Generated from darwin/layers/layer-water-purification-coverage.toml (develop).

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