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GeoLint

GeoLint is the spatial equivalent of a code linter and auto-formatter for maps.

A robust, open-source Python toolkit to systematically detect, validate, repair, and standardize geospatial vector datasets with an intuitive web interface.

Features

🔍 Validation Engine

  • File integrity checks (shapefile bundles, format validation)
  • Geometry validity analysis
  • Mixed geometry type detection
  • Coordinate Reference System (CRS) presence verification

✅ Data Quality Checks

  • Topology: duplicate geometries, overlapping polygons, slivers / zero-area geometries, duplicate vertices, coverage gaps, line dangles, self-intersecting lines, pseudo-nodes
  • Attributes: ID uniqueness, null fields, shapefile-unsafe field names
  • Spec compliance: GeoJSON winding order, out-of-range coordinates

🧩 Inter-Layer & Coverage Checks

  • Coverage gaps (enclosed slivers/holes between adjacent polygons)
  • Line-network topology: dangles, self-intersections, pseudo-nodes
  • Cross-layer rules: must-not-overlap and must-be-covered-by between two layers
  • Multi-layer GeoPackage support with CRS alignment (error or align policy)

📐 Spec Conformance Profiles

  • RFC 7946 (GeoJSON): WGS84 CRS, right-hand winding, coordinate range, supported geometry types, antimeridian
  • GeoPackage: container validity, gpkg_contents/SRS tables, geometry_type_name, R-tree index
  • GeoParquet 1.1: geo file metadata, version, primary column, column encodings, CRS PROJJSON
  • CI-friendly: --fail-on-nonconformance exits non-zero when an error-severity check fails

⚙️ Config-as-Code, Contracts & Severity

  • geolint.toml / .geolint.yml: per-check severity (error/warning/info/off), thresholds, scoping
  • Data contracts: required columns, dtypes, expected geometry type / CRS / bounds, and per-column rules (not-null, unique, range, enum, regex)
  • Severity-driven exit codes (--strict) and a baseline file for incremental adoption on messy data

🚦 CI-Native Distribution

  • SARIF 2.1.0 output (--sarif) → GitHub code-scanning annotations on PRs
  • GeoJSON error layer (--error-layer) → open flagged features straight in QGIS
  • A pre-commit hook (geolint-precommit) and a reusable GitHub Action (action.yml)

☁️ Cloud-Native Scale

  • Read remote inputs directly: s3://, gs://, https:// (via GDAL /vsi and pyarrow)
  • Optional DuckDB backend (info --fast) for quick count/bbox over large GeoParquet without loading it all

🗺️ CRS Management

  • Automatic CRS detection and inference
  • Interactive CRS selection with confidence scoring
  • Popular CRS quick-select (WGS84, Web Mercator, UTM zones)
  • Bounds preview before/after reprojection

🔧 Auto-Repair

  • Fix invalid geometries using shapely.make_valid
  • Remove empty geometries
  • Explode multipart geometries (optional)
  • Normalize polygon winding order to the RFC 7946 right-hand rule
  • Remove duplicate geometries and duplicate/collinear vertices
  • Reproject to target CRS

📊 Batch Processing

  • Multi-file upload and processing
  • Unified CRS strategy selection
  • Merge multiple datasets into single file
  • Aggregate validation reports

🌐 Modern Web Interface

  • Clean, responsive Streamlit UI
  • Drag-and-drop file upload
  • Real-time validation dashboard
  • Interactive charts and maps
  • Download cleaned files in multiple formats

Quick Start

Installation

Install from PyPI (this puts the geolint command on your PATH):

pip install geolint            # core CLI
pip install "geolint[web]"     # also install the Streamlit web UI

Optional extras: web (Streamlit UI), yaml (YAML config), duckdb (DuckDB backend), cloud (S3/remote I/O). Combine them, e.g. pip install "geolint[web,cloud]".

To install from source, run from the repo root:

pip install .          # regular install
pip install -e .       # editable/development install
pip install -e ".[dev]"  # with the test/lint toolchain

Run the Web App

The web UI ships as an optional extra (pip install "geolint[web]"), then:

geolint web

Open your browser to http://localhost:8501

Command Line Usage

After installation, the geolint command exposes the full toolkit:

geolint validate <input> [--json] [--report PATH]

Validate only — runs the full check suite and reports problems without modifying any data. Exits non-zero when hard errors are found (warnings alone still exit 0), making it suitable for CI pipelines. Use --json for a machine-readable report on stdout and --report PATH to write the report to a file.

Spec conformance:

  • --profile {rfc7946,geopackage,geoparquet} — check conformance against a target spec; results appear under the conformance key
  • --fail-on-nonconformance — exit non-zero when an error-severity profile check fails (CI gate)

Inter-layer & multi-layer (any of these switches to multi-layer mode; a multi-layer GeoPackage is auto-detected):

  • --layer NAME — select a GeoPackage layer (repeatable)
  • --against PATH — additional layer/file for cross-layer checks (repeatable)
  • --must-not-overlap A:B — assert layer A does not overlap layer B (repeatable)
  • --must-be-covered-by A:B — assert layer A is fully covered by layer B (repeatable)
  • --coverage-gaps LAYER / --coverage-gaps-all — check layer(s) for coverage gaps
  • --crs-policy {error,align} — how to handle differing CRS across layers (default error)
  • --target-crs EPSG:XXXX — target CRS for --crs-policy align
  • --force — run checks past the feature-count safety caps

geolint info <input> [--json] [--infer-crs]

Print CRS information, bounds, and geometry types for a dataset. With --infer-crs, GeoLint suggests a likely CRS when none is set. --json emits the info as JSON. Use --list-profiles (no input needed) to list the available conformance profiles.

geolint fix <input> -o OUTPUT [options]

Repair, reproject, and export a single file. Options:

  • -f, --format {gpkg,geojson,shp,parquet} — output format
  • --assign-crs EPSG:XXXX — set the CRS without reprojecting (use when the data has no CRS)
  • --target-crs EPSG:XXXX — reproject to the given CRS
  • --no-fix-invalid — skip invalid-geometry repair
  • --no-remove-empty — keep empty geometries
  • --remove-duplicates — drop duplicate geometries
  • --clean-vertices — remove duplicate/collinear vertices
  • --normalize-winding — normalize polygon winding to the RFC 7946 right-hand rule
  • --explode-multipart — split multipart geometries into single parts
  • --simplify TOL — simplify geometries with the given tolerance
  • --report PATH — write the operation report to a file
  • --json — print a machine-readable JSON report

geolint batch <inputs...> -o OUTDIR [options]

Validate, repair, and reproject many files at once, writing the results to OUTDIR. Options:

  • --no-unify-crs — do not unify the CRS across inputs
  • --target-crs EPSG:XXXX — target CRS for unification/reprojection
  • --crs-strategy {manual,use_most_common,auto_detect} — how to choose the unified CRS
  • --no-fix-geometries — skip geometry repair
  • --merge — write a single merged file instead of one per input
  • -f, --format {gpkg,geojson,shp,parquet} — output format
  • --report PATH — write an aggregate report to a file

geolint web

Launch the Streamlit web UI.

Examples

# Validate a file in CI (exits non-zero on hard errors)
geolint validate path/to/data.gpkg --json

# Inspect a dataset and suggest a CRS when none is set
geolint info path/to/data.shp.zip --infer-crs

# Repair, reproject, and simplify a single file
geolint fix data.shp.zip -o clean.gpkg --target-crs EPSG:4326 --simplify 0.001

# Assign a CRS to data that has none, then export to GeoJSON
geolint fix points.csv -o points.geojson -f geojson --assign-crs EPSG:4326

# Batch process several files into one merged GeoPackage
geolint batch a.geojson b.gpkg -o out/ --merge -f gpkg

# Check GeoJSON RFC 7946 conformance and fail CI if non-conformant
geolint validate data.geojson --profile rfc7946 --fail-on-nonconformance

# Inter-layer checks across two files
geolint validate parcels.geojson --against roads.geojson \
    --must-not-overlap parcels:roads --json

# Multi-layer GeoPackage: coverage gaps + containment rule
geolint validate city.gpkg --coverage-gaps-all \
    --must-be-covered-by buildings:parcels

# List available conformance profiles
geolint info --list-profiles

# Launch the web UI from the CLI
geolint web

Configuration, CI gating & cloud inputs

Declare a geolint.toml (or .geolint.yml) in your project root to turn GeoLint into a real gate (see examples/geolint.toml):

[severity]                      # error | warning | info | off
overlapping_polygons = "error"
pseudo_nodes = "off"

[thresholds]
gap_area_tol = 0.0

[contract]                      # data contract: what the dataset must look like
required_columns = ["id", "name"]
geometry_type = "Polygon"
crs = "EPSG:4326"

[[contract.columns]]
name = "id"
not_null = true
unique = true
# Gate CI on a config (error-severity findings -> exit 1); treat warnings as errors with --strict
geolint validate parcels.gpkg --config geolint.toml
geolint validate parcels.gpkg --strict

# Adopt incrementally on messy data: snapshot current findings, then suppress them
geolint validate parcels.gpkg --strict --write-baseline .geolint-baseline.json
geolint validate parcels.gpkg --strict --baseline .geolint-baseline.json

# Emit SARIF for GitHub code scanning, and a GeoJSON layer of the offending features
geolint validate parcels.gpkg --strict --sarif geolint.sarif --error-layer errors.geojson

# Read remote data, or get a fast count/bbox of huge GeoParquet via DuckDB
geolint validate s3://bucket/parcels.parquet --profile geoparquet
geolint info s3://bucket/huge.parquet --fast

GeoLint ships a pre-commit hook (.pre-commit-hooks.yaml) and a reusable GitHub Action (action.yml); see examples/github-workflow.yml for a ready-to-copy workflow that uploads SARIF.

# .pre-commit-config.yaml
- repo: https://github.com/CONFUZ3/geolint
  rev: v0.2.0
  hooks:
    - id: geolint
      args: [--strict]

Interactive Mode

For exploratory work, GeoLint ships an interactive REPL and a guided wizard so you can load a dataset once and iterate on it without re-running the CLI.

REPL Shell

geolint            # no args -> opens the REPL
geolint shell      # same thing, explicitly
geolint shell data.gpkg   # preload a file on startup

Both forms open a persistent shell with a geolint> prompt. Command history and tab-completion are available. The following commands are supported inside the shell:

  • load <path> — load a dataset into the session
  • info — print CRS, bounds, and geometry types
  • check (alias validate) — run the full validation suite
  • infer-crs — suggest a likely CRS when none is set
  • assign-crs <crs> — set the CRS without reprojecting (e.g. assign-crs EPSG:4326)
  • reproject <crs> — reproject the loaded dataset to the given CRS
  • fix [--no-fix-invalid] [--no-remove-empty] [--remove-duplicates] [--clean-vertices] [--normalize-winding] [--explode-multipart] [--simplify TOL] — repair geometries in place
  • save <path> [--format FMT] — export the current dataset
  • reset — discard changes and restore the originally loaded dataset
  • status — show what is currently loaded and any pending changes
  • health — quick health summary of the current dataset
  • /help — list available commands
  • /quit — exit the shell

The REPL is also scriptable — pipe a list of commands to it:

printf 'load x.gpkg\ncheck\nquit\n' | geolint shell

Guided Wizard

geolint wizard           # start the wizard
geolint wizard data.gpkg # preload a file

The wizard walks you through a step-by-step flow: load a file -> validate it -> choose a CRS -> choose which fixes to apply -> export the result.

Supported Formats

  • Input: Shapefile (.zip), GeoPackage (.gpkg), GeoJSON (.geojson), KML (.kml), CSV with lat/lon columns (.csv), GeoParquet (.parquet)
  • Output: GeoPackage (.gpkg), GeoJSON (.geojson), Shapefile (.zip)

Usage

Single File Mode

  1. Upload a geospatial file
  2. Review validation results and CRS information
  3. Select target CRS and fix options
  4. Click "AutoFix" to process
  5. Download cleaned file and report

Batch Processing Mode

  1. Upload multiple files
  2. Choose unified CRS strategy
  3. Run batch validation and operations
  4. Download all cleaned files or merged dataset

Architecture

geolint/
├── geolint/
│   ├── core/           # Core validation and processing engine
│   │   ├── validation.py
│   │   ├── checks.py    # Topology, attribute & spec quality checks
│   │   ├── crs.py
│   │   ├── geometry.py
│   │   ├── transform.py
│   │   ├── batch.py
│   │   └── report.py
│   ├── cli/            # Command-line interface
│   │   └── main.py
│   └── web/            # Streamlit web interface
│       ├── app.py
│       ├── components.py
│       └── styles.css
├── tests/              # Comprehensive test suite
└── requirements.txt

Development

Running Tests

pytest

Code Formatting

black geolint/
isort geolint/

About

A robust, open-source Python toolkit to systematically detect, validate, repair, and standardize geospatial vector datasets with an intuitive web interface.

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MIT license
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Releases 2

v0.2.1 Latest
Jun 22, 2026
+ 1 release

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