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Open AccessArticle

Geo-DMP: A DTN-Based Mobile Prototype for Geospatial Data Retrieval

by Chao Li 1, Huimei Lu 1, Yong Xiang 2,* and Rui Gao 1
1
School of Computer Science and Technology, Beijing Institute of Technology, Beijing 100081, China
2
Department of Computer Science and Technology, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2020, 9(1), 8; https://doi.org/10.3390/ijgi9010008
Received: 6 November 2019 / Revised: 8 December 2019 / Accepted: 16 December 2019 / Published: 20 December 2019
Geospatial information is gaining immense interest and importance as we enter the era of highly developed transportation and communication. Despite the proliferation of cellular network and WiFi, on some occasions, users still face barriers to accessing geospatial data. In this paper, we design and implement a distributed prototype system with a delay/disruption tolerant network (DTN), named Geo-DMP, for cooperatively and opportunistically sharing and exchanging named geospatial contents in a device-to-device fashion. First of all, we construct a lightweight “content agent” module to bridge the gap between the application layer and the underlying DTN protocol stack. Afterwards, to profile the mobility history of users in practical geospatial environments, we present a map segmentation scheme based on road network and administrative subdivision information. Subsequently, we associate the regional movement history information with the content retrieval process to devise a hierarchical and region-oriented DTN routing scheme for both requests and responses. Finally, we conduct extensive experiments with real-world trajectories and complete implementations on the emulation platform composed of virtual machines. The experiments corroborate that Geo-DMP has the capability of successfully retrieving geospatial contents for users for most of the time under mobile circumstances with episodic connectivity. Moreover, en-route caches can be efficiently exploited to provision contents from multiple sources with less network resource consumption and shorter user-perceived latencies. View Full-Text
Keywords: geospatial data retrieval; distributed mobile prototype; delay tolerant networking; region-based routing protocol geospatial data retrieval; distributed mobile prototype; delay tolerant networking; region-based routing protocol
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Li, C.; Lu, H.; Xiang, Y.; Gao, R. Geo-DMP: A DTN-Based Mobile Prototype for Geospatial Data Retrieval. ISPRS Int. J. Geo-Inf. 2020, 9, 8.

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