cff-version: 1.2.0
title: "Petrel Flow Accumulation Layer v0.1 Global (DEM-derived)"
message: "If you use this dataset, please cite it as below."
type: dataset
authors:
  - name: "Petrel"
    website: "https://petreldata.io"
date-released: "2026-07-28"
version: "v0.1-global-dem"
license: "CC-BY-NC-4.0"
url: "https://petreldata.io/layers/flow_accumulation/v0.1"
keywords:
  - "flow accumulation"
  - "drainage"
  - "distance to drainage"
  - "topographic wetness index"
  - "TWI"
  - "hydrology"
  - "digital elevation model"
  - "Copernicus DEM"
  - "global"
abstract: >
  Global drainage-structure dataset at 278 m (9 arcsec) resolution, in two
  rasters: distance-to-nearest-drainage-channel (metres) and the topographic
  wetness index (TWI). Both are derived entirely from the Copernicus GLO-30
  DEM using pysheds (fill_pits -> fill_depressions -> resolve_flats -> flowdir
  -> D8 accumulation), with channels defined as cells whose upstream
  accumulation exceeds 1000 cells. A single permissive input keeps the
  derived Layer free of license entanglements — released CC-BY-NC-4.0 for the
  community as an unencumbered replacement for HydroSHEDS/HydroRIVERS. Coast-clipped to the GSHHG full-resolution
  shoreline; Antarctica excluded. v0.1 is halo-tiled (1 deg / ~110 km): the
  drainage network structure is correct, but absolute accumulation for major
  trans-halo rivers is under-counted; a Barnes-style global two-pass
  accumulation is scheduled for v1. Attribution to the underlying DEM is
  required: "(c) DLR/Airbus, provided under COPERNICUS by the European Union
  and ESA."
references:
  - type: data
    authors:
      - name: "European Space Agency"
      - name: "Airbus"
    title: "Copernicus DEM - Global and European Digital Elevation Model (GLO-30)"
    year: 2022
    doi: "10.5270/ESA-c5d3d65"
  - type: software
    authors:
      - family-names: "Bartos"
        given-names: "Matt"
    title: "pysheds: simple and fast watershed delineation in Python"
    year: 2020
    doi: "10.5281/zenodo.3822494"
  - type: article
    authors:
      - family-names: "Wessel"
        given-names: "Paul"
      - family-names: "Smith"
        given-names: "Walter H. F."
    title: "A global, self-consistent, hierarchical, high-resolution shoreline database"
    year: 1996