野外科考中移动终端自定义地图技术研究与应用

科研工作者在野外考察中经常使用移动智能终端进行数据采集、人员活动跟踪等工作。由于野外网络信号差,且地处偏远,部分区域会出现地图缺失和地图精度低的问题。为了补充低精度地区的地图数据,满足缺失地图区域的移动端离线使用需求,本文对自定义地图的数据获取、图库构建、离线存储等相关技术进行了研究,提出了移动终端自定义地图离线加载的解决方案。该方案首先使用开源软件 Mobile Atlas Creator 下载缺失区域地图,其次通过瓦片金字塔和瓦片系统规则构建地图瓦片图库,最后依据 MBTiles 规范进行离线地图瓦片存储和展示。基于该方案生成的系统可获取地图资源,创建自定义地图并提供离线功能,该系统不仅为地图缺失地区提供了高清地图,而且克服了海量数据在移动终端的存储难关,大幅提高了离线地图读取速度,为科考工作顺利开展提供重要地理信息。

Research and Realization of Custom Map Method on Mobile Terminal in the Field Expedition

Mobile terminals have been widely used for data acquisition or tracking human activities in the field study. Because of poor network signal and geographic location, there are some difficulties withfield study, such likethelack of map or low-resolution. The primary goal of this paper is proposing a solution of custom map offline loading in the mobile terminal includingcustom map’s data acquisition, library construction and offline storage. First, the missing mapsare downloaded by open source softwareMobile Atlas Creator. Then, map gallery is built through tile pyramid method and tile system organizationrules.At last, MBTiles specification is used for offline maps’ storage and visualization. We built a system forcustom map creation and offline maps. This system can not only provide important geographic information for the scientific expedition, but also overcome the storage difficulties ofmassive data in the mobile terminals.