17:15 〜 18:45
[MAG32-P07] Refinement Mechanism of the Land Use Change Detection for Slope Areas
キーワード：Satellite Monitoring, Change Detection, Very High Resolution (VHR) Satellite Imagery
In recent decades, Taiwan has undergone a significant economic transformation, transitioning from an agriculture-based to an industrial-based society. This shift has led to notable changes in land use and increased development rates in slope areas. Responding to the challenges posed by illegal land-use developments in these slope regions, the government has implemented a satellite monitoring project. This project utilizes SPOT6/7 satellite images (with a spatial resolution of 1.5 meters) for large-scale and multi-temporal monitoring of land-use changes. Subsequently, investigators will conduct field inspections to assess the legality of land use. Nevertheless, SPOT6/7 satellites generally have a wider swath width compared to some high-resolution satellites. In specific locations, this can limit the ability to discern fine details. To address this limitation, this study aims to integrate very high-resolution Pléiades satellite images (with a spatial resolution of 0.5 meters) into the existing satellite monitoring project. The primary focus is on enhancing the mechanism for detecting land use changes in slope areas.
Comparative analysis reveals that SPOT6/7 satellites, with their broader swath width, efficiently cover a 60-kilometer area during each pass, making them advantageous for broad-scale monitoring. Conversely, Pléiades satellites, featuring a narrower swath width of 20 kilometers during each pass, excel in detecting small objects, a capability potentially unattainable using SPOT6/7 satellite images. Notably, the monitoring results underscore a significant difference in the change area detected between Pléiades and SPOT6/7 satellite images. More than 50% of the change area detected by Pléiades satellite images is smaller than 500 square meters, whereas more than 80% of the change area detected by SPOT6/7 satellite images is larger than 500 square meters.
As stated above, SPOT6/7 satellite images play a role in monitoring all slope areas, providing broad-scale coverage. On the other hand, Pléiades satellite images, with a superior spatial resolution of 0.5 meters, excel in detecting subtle variations in slope areas. This capability facilitates the identification of early-stage development activities, enabling the timely provision of information to the government. It can help the government to clarify the legality of development activities, thereby aiding in the prevention of the escalation of violations. For projects with budget constraints, this study recommends a comprehensive approach by integrating multi-scale satellite images, combining both SPOT6/7 and Pléiades. This integrated method optimally utilizes resources and time, striking a balance between the advantages of high-resolution imagery and considerations for cost and coverage.
Comparative analysis reveals that SPOT6/7 satellites, with their broader swath width, efficiently cover a 60-kilometer area during each pass, making them advantageous for broad-scale monitoring. Conversely, Pléiades satellites, featuring a narrower swath width of 20 kilometers during each pass, excel in detecting small objects, a capability potentially unattainable using SPOT6/7 satellite images. Notably, the monitoring results underscore a significant difference in the change area detected between Pléiades and SPOT6/7 satellite images. More than 50% of the change area detected by Pléiades satellite images is smaller than 500 square meters, whereas more than 80% of the change area detected by SPOT6/7 satellite images is larger than 500 square meters.
As stated above, SPOT6/7 satellite images play a role in monitoring all slope areas, providing broad-scale coverage. On the other hand, Pléiades satellite images, with a superior spatial resolution of 0.5 meters, excel in detecting subtle variations in slope areas. This capability facilitates the identification of early-stage development activities, enabling the timely provision of information to the government. It can help the government to clarify the legality of development activities, thereby aiding in the prevention of the escalation of violations. For projects with budget constraints, this study recommends a comprehensive approach by integrating multi-scale satellite images, combining both SPOT6/7 and Pléiades. This integrated method optimally utilizes resources and time, striking a balance between the advantages of high-resolution imagery and considerations for cost and coverage.