3D Building Model Construction Tools for Geometric Correction
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Solution Overview
Problem
Construction of 3D building models from images faces inaccuracies due to the difficulty in determining structure heights and characteristics from 'bird's eye' views, leading to incoherent rooftop geometries and wall edge definitions, which propagates errors across models and tools.
Innovation Solution
A geocoding engine correlates oblique and vertical images with terrain maps by determining camera parameters and pixel mapping, using triangulation and rectification methods to generate accurate 3D models, correcting incoherencies and enhancing terrain models for precise structure identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 3D building models are constructed from satellite images using automatic processing tools, then productivity is improved, but manufacturing precision deteriorates due to incoherent rooftop geometries and wall edge definitions
Solution Approach 1:
The system uses feedback by comparing automatically generated 3D building models with actual oblique images. The feedback loop identifies discrepancies in rooftop geometries and wall edge definitions, allowing the system to iteratively refine and correct inaccuracies in the constructed models.
Solution Approach 2:
Oblique images serve as an intermediary medium between satellite images and the final 3D building models. The oblique images provide additional geometric constraints and visual information that mediate the construction process, enabling more accurate rooftop geometry and wall edge definition compared to using satellite images alone.
2Measurement precision
If oblique images are used to determine structure heights and characteristics, then measurement precision is improved, but device complexity increases due to additional camera parameter requirements
Solution Approach 1:
The system performs preliminary action by pre-determining and storing camera parameters (focal length, camera angle, altitude, position) before the actual 3D modeling process. This preliminary preparation of image metadata simplifies the subsequent correlation process between oblique images and terrain maps, reducing the complexity during the main processing phase.
Solution Approach 2:
The system replaces complex mechanical measurement systems with computational methods. Instead of using physical measurement devices on-site, the patent uses computer-based algorithms to process oblique images and extract structure heights and characteristics, substituting mechanical complexity with computational processing.
3Loss of time
If automatic processing tools are used to generate 3D models, then loss of time is reduced, but loss of information increases due to confusion between building edges and image artifacts
Solution Approach 1:
The system applies dynamics by making the processing approach adaptive rather than static. The method dynamically adjusts between automatic processing and manual verification based on the complexity and quality of the generated models. This dynamic approach allows the system to maintain speed while minimizing information loss by selectively applying manual correction only where needed.
Solution Approach 2:
The system uses an intermediary verification step where generated 3D models are compared against the original oblique images and terrain data. This intermediary check acts as a filter to identify cases where building edges may have been confused with image artifacts, allowing for selective correction without requiring complete manual review of all models.
Data Source
AI summary
A method for correcting 3D building objects is provided. Construction tools available within the visualization tool provide edge squaring and edge snapping of the 3D building objects, correcting incoherent angles and planes resulting from errors formed during the construction of the building model. Specified angular thresholds for perpendicular axis and parallel planes are provided in the construction tools to identify inaccuracies within selected buildings and new buildings are redrawn.