SAR Data Search Apparatus for InSAR Generation
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Solution Overview
Problem
Existing methods for selecting SAR data pairs for generating InSAR data do not consider observation dates/times, leading to difficulties in generating accurate data, especially for DInSAR applications where time-separated data is required.
Innovation Solution
An SAR data search apparatus and method that allows for inputting search conditions including a purpose and observation date/time criteria, enabling the selection of optimal SAR data pairs based on metadata storage, which includes observation dates/times, to minimize vertical baseline length and ensure temporal proximity for accurate InSAR data generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If SAR data pairs are selected without considering observation dates/times, then the search process is simple, but the accuracy of generated InSAR data deteriorates
Solution Approach 1:
The patent introduces observation date/time as a critical parameter in the data selection process. By changing the selection criteria from only spatial parameters to include temporal parameters, the system achieves both automated simple operation and high accuracy data selection for InSAR generation
Solution Approach 2:
The patent performs preliminary filtering of SAR data based on observation date/time conditions before final pair selection. This preliminary action reduces the candidate data set and ensures that only temporally appropriate data pairs are considered, improving both automation and accuracy
2Manufacturing precision
If the interval between observation dates/times of SAR data pairs is reduced, then the accuracy of InSAR data generation is improved, but the number of available data pairs decreases
Solution Approach 1:
The patent implements dynamic adjustment of the observation date/time interval threshold based on the specific InSAR application requirements. For DSM generation, smaller intervals are enforced, while for DInSAR, larger intervals are permitted, optimizing the balance between data quality and availability for different purposes
Solution Approach 2:
The patent segments the data selection process into different branches based on the InSAR generation purpose. By dividing the selection criteria according to application type (DSM vs. DInSAR), the system can apply appropriate time interval constraints for each segment, maximizing the number of suitable data pairs for each specific application
3Reliability
If observation date/time conditions are added to search criteria, then the quality of selected SAR data pairs is improved, but the complexity of the search process increases
Solution Approach 1:
The patent enables the search system to automatically retrieve and compare observation date/time metadata from the SAR data set without requiring manual input or complex user configuration. The system serves itself by autonomously filtering and ranking data pairs based on temporal proximity, maintaining high quality selection while keeping the user interface simple
Solution Approach 2:
The patent designs a universal search framework that handles both simple and complex selection criteria through a single integrated system. The same search apparatus can operate with or without observation date/time constraints, and can adapt to different InSAR application types, avoiding the need for multiple specialized tools
Data Source
AI summary
In order to enable to change a search condition of a set of SAR data, depending on a purpose of generating InSAR data, an SAR data search method according to an exemplary aspect of the invention includes: receiving an input of a search condition comprising a search purpose and an observation date/time condition, switching the observation date/time condition to be used as the search condition, depending on the search purpose, and extracting, from a metadata storage unit configured to store metadata comprising an observation date/time associated with identification information of an SAR data, the identification information of a set of the SAR data that satisfies the search condition, and outputting the extracted identification information of each piece of the SAR data in the set.