urban-imageable 0.1.3

Computer vision library for extracting 43+ building properties from street view images and footprints

imageable

An open-source Python library for extracting 43+ building properties from street view images and building footprints. Designed for urban planners, architects, climate resilience researchers, and GIS professionals.

Features

• Height Estimation: Estimate building heights from single street-level images using vanishing point detection and semantic segmentation
• Material Analysis: Segment and quantify façade materials (brick, glass, concrete, etc.)
• Footprint Properties: Extract 21 geometric, engineered, and contextual features from building polygons
• Image Features: Analyze color, shape, and façade characteristics from street view images
• Batch Processing: Process entire neighborhoods via GeoDataFrames or GeoJSON files

Installation

pip install urban-imageable

For Development

# Clone the repository
git clone https://github.com/scalable-design-participation-lab/imageable.git
cd imageable

# Install with uv (recommended)
uv sync --group dev

Quick Start

Single Building Analysis

import imageable
from shapely.geometry import Polygon

# Define building footprint (WGS84 coordinates)
footprint = Polygon([
    (-71.0589, 42.3601),
    (-71.0585, 42.3601),
    (-71.0585, 42.3605),
    (-71.0589, 42.3605),
])

# Get street view image
image, metadata = imageable.get_image(api_key, footprint)

# Extract all 43+ properties
props = imageable.get_dataset(api_key, footprint)
print(f"Estimated height: {props.building_height}m")
print(f"Projected area: {props.projected_area}m²")
print(f"Shape complexity: {props.complexity}")

Batch Processing from GeoDataFrame

import geopandas as gpd
import imageable

# Load building footprints
gdf = gpd.read_file("buildings.geojson")

# Extract properties for all buildings
result = imageable.get_building_data_from_gdf(
    gdf,
    api_key,
    id_column="building_id",
    neighbor_radius=100.0,  # meters
    verbose=True,
)

# Result is a GeoDataFrame with 43+ new columns
print(result.columns)

From GeoJSON File

import imageable

# Process directly from GeoJSON
result = imageable.get_building_data_from_geojson(
    "buildings.geojson",
    api_key,
    output_format="gdf",  # or "geojson", "dict"
)

With Pre-downloaded Images

import imageable

# Process from local footprints and images
result = imageable.get_building_data_from_file(
    "footprints.geojson",
    "images/",  # Directory containing images named by building ID
    id_column="building_id",
)

Extracted Properties

Footprint Properties (21 features)

Geometric (6):

• unprojected_area, projected_area: Area in original and projected CRS
• longitude_difference, latitude_difference: Bounding box dimensions
• n_vertices: Number of polygon vertices
• shape_length: Perimeter length

Engineered (5):

• complexity: Perimeter/area ratio
• inverse_average_segment_length: Edge length metric
• vertices_per_area: Vertex density
• average_complexity_per_segment: Segment-level complexity
• isoperimetric_quotient: Circularity measure (4πA/P²)

Contextual (10):

• neighbor_count: Number of buildings within radius
• mean_distance_to_neighbors: Average centroid distance
• nearest_neighbor_distance: Distance to closest building
• n_size_mean/std/min/max/cv: Neighbor area statistics
• expected_nearest_neighbor_distance: Random distribution expectation
• nni: Nearest neighbor index

Height Estimation

• building_height: Estimated height in meters using CV pipeline (vanishing points + segmentation)

Image Features (16 features)

Color (5):

• average_red/green/blue_channel_value: RGB means
• average_brightness: HSV brightness percentage
• average_vividness: HSV saturation percentage

Shape (5):

• mask_area: Segmented building pixels
• mask_length: Boundary perimeter
• mask_complexity: Length/area ratio
• number_of_edges, number_of_vertices: Polygon complexity

Façade (6):

• average_window_x/y: Window centroid location
• average_door_x/y: Door centroid location
• number_of_windows, number_of_doors: Element counts

Material Percentages

• material_percentages: Dictionary of façade material coverage (brick, glass, concrete, metal, etc.)

API Reference

Main Functions

# Batch processing
imageable.get_building_data_from_gdf(gdf, api_key, ...)
imageable.get_building_data_from_geojson(source, api_key, ...)
imageable.get_building_data_from_file(footprints, images_dir, ...)

# Single building
imageable.get_dataset(api_key, footprint, ...)
imageable.get_image(api_key, footprint, ...)

# Data class
imageable.BuildingProperties

BuildingProperties

from imageable import BuildingProperties

# Create and populate
props = BuildingProperties(building_id="b001")
props.update_footprint_features(footprint_dict)
props.update_height(25.5)
props.update_material_percentages({"brick": 60.0, "glass": 40.0})

# Export
props.to_dict()  # Dictionary
props.to_json("output.json")  # JSON file
props.get_feature_vector()  # NumPy array for ML

# Import
props = BuildingProperties.from_dict(data)
props = BuildingProperties.from_json("input.json")

Requirements

• Python 3.13+
• Google Street View API key (for image acquisition and height estimation)
• See pyproject.toml for full dependency list

Development

# Run tests
uv run pytest

# Run tests with coverage
uv run pytest --cov-report=html
open htmlcov/index.html

# Lint and format
uv run pre-commit run --all-files

# Build package
uv build

Project Structure

imageable/
├── src/imageable/
│   ├── core/              # Public API
│   │   ├── building_data.py   # Batch processing
│   │   ├── dataset.py         # Single building extraction
│   │   └── image.py           # Image acquisition
│   ├── _extraction/       # Property extraction
│   │   ├── building.py        # BuildingProperties dataclass
│   │   ├── extract.py         # Main orchestrator
│   │   ├── footprint.py       # Footprint features
│   │   └── image.py           # Image features
│   ├── _features/         # Feature pipelines
│   │   ├── height/            # Height estimation
│   │   └── materials/         # Material segmentation
│   ├── _images/           # Image acquisition
│   │   ├── camera/            # Camera parameters
│   │   └── download.py        # Street View API
│   └── _models/           # ML models
│       ├── huggingface/       # SegFormer segmentation
│       ├── lcnn/              # Line detection
│       └── vpts/              # Vanishing points
└── tests/                 # Test suite

Citation

If you use imageable in your research, please cite:

@software{imageable2025,
  author = {Ngo, Khoi and Legaria, Uriel and Sandoval Olascoaga, Carlos},
  title = {imageable: Computer Vision Library for Urban Building Analysis},
  year = {2025},
  url = {https://github.com/scalable-design-participation-lab/imageable}
}

License

MIT License - see LICENSE for details.

Authors

• Khoi Ngo (Khoi Ngo) - [e-mail]
• Uriel Legaria
• Carlos Sandoval Olascoaga

Developed at the Scalable Design Participation Lab, Northeastern University.