nmaipy 4.2.1

Nearmap AI Python Library for extracting AI features from aerial imagery

nmaipy - Nearmap AI Python Library

Extract building footprints, vegetation, damage assessments, and other AI features from Nearmap's aerial imagery using simple Python code.

What is nmaipy?

nmaipy (pronounced "en-my-pie") is a Python library that makes it easy for data scientists to access Nearmap's AI-powered geospatial data. Whether you're analyzing a few properties or processing millions of buildings across entire cities, nmaipy handles the complexity so you can focus on your analysis.

Supported countries: au (Australia), us (United States), nz (New Zealand), ca (Canada)

Quick Start for Data Scientists

1. Install

Option A: Using pip

pip install -e .

Option B: Using conda

Minimal installation (core features only):

conda env create -f environment-minimal.yaml
conda activate nmaipy

Full installation (includes development and notebook tools):

conda env create -f environment.yaml
conda activate nmaipy

Option C: Install into existing conda environment

conda install -c conda-forge geopandas pandas numpy pyarrow psutil pyproj python-dotenv requests rtree shapely stringcase tqdm fsspec s3fs
pip install -e .

Additional options

For running notebooks with pip:

pip install -e ".[notebooks]"

For development with pip:

pip install -e ".[dev]"

2. Set your API key

export API_KEY=your_api_key_here

3. Run your first extraction

from nmaipy.exporter import NearmapAIExporter

# Extract building and vegetation data
exporter = NearmapAIExporter(
    aoi_file='my_parcels.geojson',  # Your areas of interest
    output_dir='results',            # Where to save outputs
    country='au',                     # au, us, nz, or ca
    packs=['building', 'vegetation'], # What features to extract
    processes=4                       # Parallel processing
)

exporter.run()

That's it! Your results will be saved as CSV or Parquet files in the output directory.

Note: AOIExporter is available as a backward-compatible alias for NearmapAIExporter.

Common Use Cases

Urban Planning

Extract comprehensive data about buildings, vegetation coverage, and surface materials:

exporter = NearmapAIExporter(
    aoi_file='city_blocks.geojson',
    output_dir='urban_analysis',
    country='au',
    packs=['building', 'vegetation', 'surfaces', 'solar'],
    save_features=True,  # Get individual features, not just summaries
    include_parcel_geometry=True  # Keep boundaries for GIS analysis
)

Disaster Response

Assess damage after natural disasters like hurricanes or floods:

exporter = NearmapAIExporter(
    aoi_file='affected_areas.geojson',
    output_dir='damage_assessment',
    country='us',
    packs=['damage'],
    since='2024-07-08',  # Date range of the event
    until='2024-07-11',
    rapid=True,  # Use rapid post-catastrophe imagery
    save_features=True
)

Environmental Analysis

Study vegetation coverage and tree canopy:

exporter = NearmapAIExporter(
    aoi_file='study_area.geojson',
    output_dir='vegetation_study',
    country='au',
    packs=['vegetation'],
    save_features=True  # Get individual tree polygons
)

Market Research

Find properties with pools or solar panels:

exporter = NearmapAIExporter(
    aoi_file='suburbs.geojson',
    output_dir='market_analysis',
    country='au',
    packs=['pools', 'solar'],
    include_parcel_geometry=True
)

Roof Age Analysis (US Only)

Predict roof installation dates using AI analysis of historical imagery.

Unified approach (recommended) - combines Feature API and Roof Age in one export:

exporter = NearmapAIExporter(
    aoi_file='properties.geojson',
    output_dir='unified_results',
    country='us',
    packs=['building'],
    roof_age=True,  # Include Roof Age API data
    save_features=True
)
exporter.run()

Standalone approach - for roof age data only:

from nmaipy.roof_age_exporter import RoofAgeExporter

exporter = RoofAgeExporter(
    aoi_file='properties.geojson',
    output_dir='roof_age_results',
    country='us',
    threads=10,
    output_format='both'  # Generate both GeoParquet and CSV
)
exporter.run()

The Roof Age API uses machine learning to analyze multiple imagery captures over time, combined with building permit data and climate information, to predict when roofs were last installed or significantly renovated. Each roof feature includes:

• Predicted installation date
• Confidence score (trust score)
• Evidence type and number of captures analyzed
• Timeline of all imagery used in analysis

This is valuable for:

• Insurance underwriting and risk assessment
• Property valuation and market analysis
• Maintenance planning and capital budgeting
• Real estate due diligence

Available AI Features

Some of the more common AI packs are below - there are more and growing, available via API request or on the Nearmap help.nearmap.com page.

Pack	Description	Example Use Cases
building	Building footprints and heights	Urban planning, property analysis
vegetation	Trees and vegetation coverage	Environmental studies, urban forestry
surfaces	Ground surface materials	Permeability studies, heat mapping
pools	Swimming pool detection	Compliance, market research
solar	Solar panel detection	Renewable energy assessment
damage	Post-disaster damage classification	Insurance, emergency response
building_characteristics	Detailed roof types, materials	Detailed property analysis

Input Data Formats

nmaipy accepts areas of interest (AOIs) in several formats:

• GeoJSON: Standard geospatial format with polygons
• GeoPackage (GPKG): OGC standard for geospatial data
• Parquet / GeoParquet: Efficient columnar format for large datasets
• CSV: Simple format with WKT geometries (also supports TSV and PSV)

Your input file should contain polygon geometries representing the areas you want to analyze (parcels, census blocks, suburbs, etc.).

Output Data

The exporter writes results to {output_dir}/final/ with the following structure:

File	Description
{stem}_aoi_rollup.csv or .parquet	One row per AOI with summary statistics (counts, areas, confidences)
{stem}_{class}.csv	Per-class attribute tables (e.g. roof.csv, building.csv)
{stem}_{class}_features.parquet	Per-class GeoParquet with feature geometries (when save_features=True)
{stem}_features.parquet	All features combined as GeoParquet (when save_features=True)
{stem}_buildings.csv or .parquet	Per-building detail rows (when save_buildings=True)
{stem}_feature_api_errors.csv	AOIs where the Feature API returned errors
{stem}_roof_age_errors.csv	AOIs where the Roof Age API returned errors (US only)
{stem}_latency_stats.csv	API timing diagnostics
export_config.json	Full record of export parameters and nmaipy version
README.md	Auto-generated data dictionary describing all output files and columns

A {output_dir}/chunks/ directory holds intermediate per-chunk results during processing, enabling resume after interruption.

For detailed column-level documentation, refer to the auto-generated README.md inside each export's final/ directory.

S3 Output Support

nmaipy can write output directly to Amazon S3. Pass an s3:// URI as the output directory:

exporter = NearmapAIExporter(
    aoi_file='properties.geojson',
    output_dir='s3://my-bucket/nmaipy-results/',
    country='us',
    packs=['building'],
)
exporter.run()

AWS credentials are resolved automatically from environment variables (AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_DEFAULT_REGION) or ~/.aws/credentials. No additional nmaipy configuration is needed.

The cache_dir parameter also accepts S3 URIs for cloud-native workflows, though local caching is faster for iterative development.

Examples

Quick start — verify your setup with 10 US properties covering buildings, features, and roof age:

export API_KEY=your_api_key_here
python run_10_test.py

More examples — see examples.py for complete, working examples covering:

• Basic building/vegetation extraction
• Damage assessment (Hurricane Beryl)
• Urban planning (multi-pack)
• Vegetation analysis
• Pool detection
• Large area gridding
• Time series extraction
• Unified roof age + feature export

Example AOI files are provided in data/examples/:

• sydney_parcels.geojson — Sydney CBD, Australia
• us_parcels.geojson — Austin, Texas, USA
• large_area.geojson — 2km x 2km Melbourne area (triggers auto-gridding)

Working with Large Areas

nmaipy automatically handles large areas by:

• Splitting them into manageable grid cells
• Processing in parallel
• Combining results seamlessly

For areas larger than 1 sq km, the library will automatically use gridding:

exporter = NearmapAIExporter(
    aoi_file='large_region.geojson',
    output_dir='large_area_results',
    country='us',
    packs=['building'],
    aoi_grid_inexact=True,  # Allow mixing survey dates if needed
    processes=16  # Use more processes for speed
)

Performance Tips

1. Use parallel processing: Set processes to the number of CPU cores available.
2. Tune chunk size: chunk_size controls how many AOIs are grouped into each parallel work unit (default: 500). Smaller values give finer-grained parallelism and cheaper resume after interruption; larger values reduce overhead.
3. Cache API responses: Use cache_dir to persist API responses to a directory. On subsequent runs with different parameters (e.g. different packs), cached responses are reused without re-fetching. By default, cache is stored in {output_dir}/cache/.
4. Filter by date: Use since and until to restrict to specific time periods, reducing data volume.

Command Line Interface

Feature API Export

python nmaipy/exporter.py \
    --aoi-file "parcels.geojson" \
    --output-dir "results" \
    --country us \
    --packs building vegetation \
    --save-features \
    --roof-age

Key options:

• --packs: AI packs to extract (building, vegetation, surfaces, pools, solar, damage, etc.)
• --roof-age: Include Roof Age API data (US only)
• --save-features: Save per-class GeoParquet files with feature geometries
• --save-buildings: Save per-building detail rows
• --rollup-format: Output format for rollup file (csv or parquet, default: csv)
• --cache-dir: Directory for caching API responses
• --no-cache: Disable caching entirely
• --primary-decision: Feature selection method (largest_intersection, nearest, optimal)
• --since / --until: Filter by survey date range
• --max-retries: Maximum API retry attempts (default: 10)

Run python nmaipy/exporter.py --help for all options.

Standalone Roof Age Export (US Only)

python -m nmaipy.roof_age_exporter \
    --aoi-file "us_properties.geojson" \
    --output-dir "roof_age_results" \
    --country us \
    --processes 4 \
    --output-format both

Run python -m nmaipy.roof_age_exporter --help for all options.

Getting Help

• Examples: See examples.py for common use cases
• Installation: See INSTALL.md for detailed installation options
• Notebooks: Check the notebooks/ directory for Jupyter notebook tutorials
• Issues: Report bugs or request features on GitHub

Requirements

• Python 3.12+
• Nearmap API key (contact Nearmap for access)
• 4GB+ RAM recommended for large extractions
• AWS credentials for S3 output (optional)

Advanced: Building a Conda Package

For system administrators who want to create a local conda package:

conda build conda.recipe
conda install --use-local nmaipy

This will create a conda package that can be shared internally or uploaded to a conda channel.

License

See LICENSE file for details.