Multi-satellite Coupling for Waterway Terrain Reconstruction
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Solution Overview
Problem
Current satellite technologies for waterway surveying and mapping cannot simultaneously achieve high precision in planar and perpendicular resolutions, and are unable to obtain terrain data below water surfaces, limiting their effectiveness in high-precision surveying and mapping.
Innovation Solution
A high-precision waterway reconstruction method is developed using multi-satellite source information coupling, which involves determining waterway sections, reconstructing basic and fixed waterway sections through joint coupling of satellite revisit times and observation elements, and interpolating water levels and surface widths to create accurate three-dimensional coordinate sets for waterway terrain mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single type of satellite is used for observation, then the observation process is simple, but both planar and perpendicular resolutions cannot be obtained simultaneously
Solution Approach 1:
The patent combines multiple types of satellites (panchromatic orthophoto image satellites, radar altimeter satellites, and laser altimeter satellites) into a unified observation system. By merging the planar observation capability from orthophoto satellites with the perpendicular elevation observation capability from altimeter satellites, the system achieves high precision in both dimensions simultaneously, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent creates a multi-functional satellite observation system where different satellite types perform complementary functions. The orthophoto satellite provides planar resolution, while radar and laser altimeter satellites provide perpendicular resolution. This multi-functionality allows the system to obtain both types of resolution data from a single integrated system, improving measurement precision without proportionally increasing complexity.
2Area of stationary object
If satellite observation is used for waterway surveying, then large area coverage is achieved, but terrain data below water surface cannot be obtained
Solution Approach 1:
The patent uses water level information as an intermediary parameter to bridge the gap between satellite observation and underwater terrain measurement. By coupling the observation of water surface characteristics with knowledge of water level fluctuations, the system can infer and reconstruct terrain data below the water surface, enabling accurate mapping of submerged areas while maintaining large area coverage.
Solution Approach 2:
The patent transitions from two-dimensional surface observation to three-dimensional terrain reconstruction by incorporating vertical elevation data from altimeter satellites. This dimensional expansion allows the system to map not only the water surface but also the terrain below, achieving comprehensive coverage including previously inaccessible submerged regions.
3Measurement precision
If historical observation information from multiple satellite types is coupled, then high-precision waterway terrain can be reconstructed, but the processing complexity increases
Solution Approach 1:
The patent segments the complex data processing into distinct modules: (1) extracting planar information from orthophoto satellites, (2) extracting elevation information from altimeter satellites, (3) coupling the two datasets through water level relationships, and (4) reconstructing the final terrain model. This segmentation makes the complex processing more manageable and systematic, achieving high precision while controlling processing complexity.
Solution Approach 2:
The patent transforms the data from multiple satellite types into a unified parameter system centered on water level and terrain elevation. By changing the representation from raw satellite measurements to standardized hydrographic parameters, the system simplifies the coupling process and reduces processing complexity while maintaining or improving measurement precision.
Data Source
AI summary
A high-precision waterway reconstruction method based on a multi-satellite source information coupling is provided. The method includes a determination method for a waterway section, a reconstruction method for a basic waterway section high-precision coupling, a reconstruction method for a fixed waterway section coupling, and a reconstruction method for a river reach waterway terrain. The method fills the gap of surveying and mapping of the waterways based on satellite remote sensing information, extremely improves the perpendicular precision and planar precision of the existing digital surface model of satellites for river waterways, and provides decision support for a water-related emergency rescue in areas lacking data.