面向增量更新的多时相瓦片服务数据模型研究与设计

Research and design of multi-temporal tile service data model for incremental updating

随着遥感影像时间分辨率的不断提高,多时相瓦片服务的应用需求也逐渐增加,但现有基于快照图像序列模型的多时相瓦片服务在数据更新、版本管理、服务发布和客户端访问方面存在诸多问题。为了减少多时相瓦片服务的数据冗余,提高服务发布效率,本文在时间快照图像序列模型基础上,结合离散格网单元列表模型,设计了面向增量更新的多时相瓦片数据模型,实现了栅格瓦片数据的增量更新与存储,解决了传统多时相瓦片存储效率与查询效率之间的矛盾,并针对现有REST风格影像瓦片地图服务,设计实现了多时相瓦片服务接口,可应用于多时相瓦片服务发布,为灾害应急、城市规划、生态环境保护提供地理信息服务支持。

With the improvement of the temporal resolution of remote sensing images,the application demand of multi-temporal tile service is gradually increasing.However,the existing multi-temporal tile service based on snapshot image sequence model has many problems in data updating,version management,service release and client access.In order to reduce the data redundancy and improve the service publishing efficiency,this paper designs a multi-temporal tile data model for incremental updating based on the time snapshot image sequence model and the discrete grid unit list model,it realizes the incremental updating and storage of raster tile data,solves the contradiction between the traditional multi-temporal tile storage efficiency and query efficiency.Based on the existing REST style image tile map services,the multi-temporal tile service interface is designed and implemented,which can be applied to multi-temporal tile service release and provide geographic information service support for disaster emergency response,urban planning and ecological environment protection.