Computer Vision • Geospatial AI

[REDACTED] Aerial Vision System

Automated Rooftop Detection & Segmentation

Client:Real Estate & Solar Energy Tech
Timeline:12 months (2024)
Team:Computer Vision Team + Geospatial Analysts
Deep LearningSemantic SegmentationInstance SegmentationPyTorchOpenCVDrone ImagerySatellite AI
System Architecture

The Challenge

Manual inspection of rooftops from aerial and satellite imagery is time-consuming, expensive, and prone to human error. For industries like solar energy and real estate, inaccurate measurements lead to significant operational inefficiencies:

  • High costs of manual site inspections and image analysis
  • Inconsistent roof boundary mapping across different property types
  • Difficulty in identifying complex multi-angle rooftop structures
  • Slow turnaround times for property assessments and solar quotes
  • Scalability issues when processing thousands of properties simultaneously

The Solution

Developed a custom computer vision pipeline that automates the detection, segmentation, and measurement of residential rooftop structures from high-resolution aerial views.

Core technical implementation:

  • Custom semantic segmentation model for precise roof boundary mapping
  • Instance segmentation to separate and analyze individual roof planes
  • Automated property ID recognition and labeling
  • High-precision structural measurement extraction from 2D imagery
  • Preprocessing pipeline for atmospheric correction and image enhancement
  • Batch processing architecture capable of handling entire city districts

Lexer System's Approach

1

Deep Learning Model Development

Trained custom segmentation models on curated datasets of high-resolution aerial and satellite imagery. Utilized ensemble methods to handle diverse architectural styles and lighting conditions.

2

Geospatial Data Processing

Implemented automated orthorectification and coordinate mapping to ensure spatial accuracy across varying camera angles and elevations.

3

Structural Measurement Extraction

Developed algorithms to calculate roof area, pitch estimations, and solar potential based on segmented polygons and shadows.

4

Automated Property Matching

Integrated address database matching with visual property ID recognition to automate the entire assessment workflow from input to report.

Results & Impact

98.5%
Detection Accuracy

Precision in identifying rooftop boundaries

10x Faster
Processing Speed

Compared to manual inspection methods

100K+ / day
Scalability

Property assessments processed in batch

<2%
Measurement Error

High-precision area and boundary calculations

Technical Highlights

Advanced Semantic Segmentation

State-of-the-art architectures for pixel-level accuracy in complex urban and suburban environments.

Property ID Recognition

Automated labeling system that connects visual detection to institutional property databases.

Multi-Angle Handling

Robust detection algorithms that maintain accuracy across diverse drone and satellite camera perspectives.

Lessons Learned

  • Image quality and atmospheric conditions significantly impact segmentation precision
  • Hybrid models combining semantic and instance segmentation yield the best results for complex roofs
  • Preprocessing is as critical as the model architecture itself for real-world reliability

Next Steps

  • Integrate 3D point cloud data for even more precise volumetric measurements
  • Expand to commercial and industrial rooftop types with specialized features
  • Implement real-time edge processing for drone-mounted inspection systems

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