Abstract
Monitoring, response, mitigation and damage assessment of disasters places a wide variety of demands on the spatial and temporal resolutions of remote sensing images. Images are divided into tile pyramids by data sources or resolutions and published as independent image services for visualization. A disaster-affected area is commonly covered by multiple image layers to express hierarchical surface information, which generates a large amount of namesake tiles from different layers that overlay the same location. The traditional tile retrieval method for visualization cannot distinguish between distinct layers and traverses all image datasets for each tile query. This process produces redundant queries and invalid access that can seriously affect the visualization performance of clients, servers and network transmission. This paper proposes an on-demand retrieval method for multi-layer images and defines semantic annotations to enrich the description of each dataset. By matching visualization demands with the semantic information of datasets, this method automatically filters inappropriate layers and finds the most suitable layer for the final tile query. The design and implementation are based on a two-layer NoSQL database architecture that provides scheduling optimization and concurrent processing capability. The experimental results reflect the effectiveness and stability of the approach for multi-layer retrieval in disaster reduction visualization.
Highlights
Rapid advancements in Earth-observing systems have led to a large amount of remote sensing data that can be used in disaster monitoring, response, mitigation and recovery [1,2,3]
This paper proposes a hybrid NoSQL-based on-demand retrieval method to address this inefficiency in multi-layer image tile services
Multi-dimensional semantics are defined in the model, and an annotation approach based on the resource description framework (RDF) is used to describe the layers
Summary
Rapid advancements in Earth-observing systems have led to a large amount of remote sensing data that can be used in disaster monitoring, response, mitigation and recovery [1,2,3] These data have become significant in the application of geographic information technology to disaster reduction. Such systems can be used to retrieve high-spatiotemporal resolution images and establish global coverage of digital earth through aerospace remote sensing technology [4,5,6,7]. This paper proposes a hybrid NoSQL-based on-demand retrieval method to address this inefficiency in multi-layer image tile services.
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