Assessment Media Correlation Chain for Geospatial GCP Accuracy
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Solution Overview
Problem
Existing methods for assessing the accuracy of geospatial datasets, particularly those generated from 3D reconstruction of satellite imagery, fail to effectively determine and propagate the positional accuracy of Ground Control Points (GCPs) across multiple reference media, leading to inconsistencies and errors in the 3D model.
Innovation Solution
A method involving the generation of an assessment media by correlating GCPs across an ordered set of reference media, forming a correlation chain that ensures each media maintains the same accuracy as the GCPs, allowing for the propagation of residual errors and enabling accurate assessment of larger geographic areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If 3D reconstruction is performed from satellite imagery to generate geospatial datasets, then the geographic coverage and data completeness are improved, but the positional accuracy and consistency of GCPs across multiple reference media deteriorate due to error propagation
Solution Approach 1:
The patent divides the large-scale geospatial dataset into multiple overlapping reference media (tiles), each independently correlated to GCPs. This segmentation allows accurate GCP correlation in each tile while maintaining overall large geographic coverage through the tile mosaic approach.
Solution Approach 2:
The patent introduces assessment media as an intermediary between the GCPs and the geospatial dataset. The assessment media carries the GCP correlation information and serves as a reference for evaluating the accuracy of the reconstructed 3D model, enabling indirect accuracy assessment without direct GCP measurement in the final dataset.
2Measurement precision
If multiple reference media are correlated iteratively to form a correlation chain, then the accuracy of 2D/3D coordinates is maintained across all media, but the computational complexity and processing time increase
Solution Approach 1:
The patent performs preliminary GCP identification and correlation in the first reference media before processing subsequent media. By pre-establishing the GCP coordinate system in the initial tile, the correlation process for subsequent tiles becomes more efficient and maintains consistency without requiring complete re-correlation of all media.
Solution Approach 2:
The patent applies full GCP correlation only to the first reference media, then uses partial correlation (leveraging the established GCP system) for subsequent overlapping media. This reduces the overall computational burden while maintaining accuracy across the correlation chain.
3Reliability
If assessment media is generated to enable accuracy determination across all reference media, then the reliability of geospatial dataset assessment is improved, but the data processing time and computational resources increase
Solution Approach 1:
The patent extracts only the essential GCP correlation information and residual error data from the full reference media into compact assessment media. This extraction creates streamlined assessment datasets that maintain reliability for accuracy determination while reducing processing time and computational resource requirements.
Solution Approach 2:
The patent creates simplified copies of the reference media in assessment media format, which contain the necessary GCP correlation information but exclude unnecessary data. These copied assessment media enable fast accuracy evaluation without processing the complete original datasets.
Data Source
AI summary
The present disclosure relates to a method (100) for providing an assessment media for use in assessing accuracy of a geospatial dataset. The method comprises obtaining (S100) an ordered set of reference media, the ordered set comprising a first and a last reference media, the first reference media comprising one or more identifiable Ground Control Point, GCP, and generating (S200) the assessment media based on establishing (S205) respective links from each GCP of the first reference media to a corresponding point in the last reference media.