Satellite Coastline Extraction Using High-Tide Image Overlay
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Solution Overview
Problem
Existing methods struggle to accurately determine the coastline due to the dynamic nature of tidal fluctuations, making it difficult to precisely define the highest tide levels over short periods without considering spatial and temporal variations in high tide occurrences.
Innovation Solution
A method and apparatus that utilizes satellite images acquired at predetermined time slots around predicted high tide times, extracts coastlines from these images, and overlays them to determine the highest tide line as the coastline, accounting for spatial distribution and temporal variations in high tides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the coastline is determined by analyzing the highest tide levels over a period of 18.6 years, then the accuracy of coastline determination is improved, but the time required for measurement and the complexity of the process increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-dividing the tidal cycle into multiple time slots and pre-acquiring satellite images at these specific time points. This allows the system to capture the highest tide levels without waiting for the complete 18.6-year period, as the time slot division anticipates when high tides will occur based on predicted high tide times
Solution Approach 2:
The patent segments the continuous tidal cycle into discrete time slots (e.g., first time slot, second time slot, third time slot) with specific time ranges before and after the predicted high tide time. This segmentation allows the system to analyze only relevant portions of the tidal cycle rather than continuously monitoring for 18.6 years, significantly reducing the measurement period while maintaining accuracy
2Measurement precision
If satellite images are acquired at multiple time slots around predicted high tide times, then the spatial distribution and temporal variation of high tide levels are captured accurately, but the number of images to be processed and the device complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-defining specific time slots (first time slot, second time slot, third time slot) with predetermined time ranges before and after the predicted high tide time. This preliminary structuring allows the image processing to focus only on these specific time windows rather than analyzing all satellite images continuously, reducing the overall processing complexity while capturing essential spatial and temporal variations
Solution Approach 2:
The patent merges multiple satellite images acquired at different time slots into a single composite result through overlay processing. By combining the information from images taken at different times (first time slot, second time slot, third time slot) into one unified coastline determination, the system reduces the complexity of handling multiple separate analyses while maintaining comprehensive spatial and temporal coverage
Data Source
Figure 1~2
AI summary
A coastline determination apparatus and method are disclosed. The method for determining a coastline includes: obtaining a predicted high tide time, setting a plurality of time slots by equally dividing a preset time range before and after the obtained predicted high tide time, acquiring satellite images including the coastline for each of the set plurality of time slots, extracting the coastline from each of the acquired satellite images through image analysis, and overlaying the satellite images from which the coastline has been extracted for the respective time slots to extract the highest tide line, and determining the extracted highest tide line as the coastline of a sea area.