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Reverse Thinking in Spatial Queries [PDF]

, 2018
In recent years, an increasing number of researches are conducted on spatial queries regarding the influence of query objects. Among these queries, reverse k nearest neighbors (RkNN) query is the one studied the most extensively. Reverse k furthest neighbors (RkFN) queries is the natural complement of RkNN queries.
Wang, Shenlu
openaire   +5 more sources

A Privacy‐Preserving Spatial Index for Spatial Query Processing

Wireless Communications and Mobile Computing, 2018
An increasing amount of active research is being conducted to protect the locations of mobile device users. Users must tune to more data than they would like to in order to hide their location. In particular, if a user requests a query over k NN, the number of objects the user must receive ...
Doohee Song, MoonBae Song, Kwangjin Park
openaire   +1 more source

Efficient Web Navigator for Multi-Constrained Spatial Keyword Queries

Journal of Communications Software and Systems, 2015
The mobile technology revolutionizes the world of communications opening up new possibilities for applications such as location based web search. It involves retrieving the user point of interest (POI) from the web documents based on the query relative ...
K.B. Priya Iyer
doaj  

A Privacy-Preserving Continuous Location Monitoring System for Location-Based Services

International Journal of Distributed Sensor Networks, 2015
To protect users’ private locations in location-based services, various location anonymization techniques have been proposed. The most commonly used technique is spatial cloaking, which organizes users’ exact locations into cloaked regions (CRs).
Doohee Song, Jongwon Sim, Kwangjin Park, Moonbae Song   +3 more
doaj   +1 more source

PP-WBHSTM: privacy-preserving weighted bidirectional heterogeneous spatial task matching

Journal of Cloud Computing: Advances, Systems and Applications
Spatial Crowdsourcing (SC) systems have emerged as an advanced application designed to match “workers” and “requesters” based on their requirements/skills and geographic locations, that named Spatial Task Matching (STM).
Faezeh Nayyeri, Ziba Eslami, Nasrollah Pakniat   +2 more
doaj   +1 more source

From questions to queries: an AI-powered multi-agent framework for spatial text-to-Sql

International Journal of Digital Earth
The complexity of SQL and the spatial semantics of PostGIS create barriers for non-experts working with spatial data. Although large language models can translate natural language into SQL, spatial Text-to-SQL is more error-prone than general Text-to-SQL
Ali Khosravi Kazazi, Zhenlong Li, M. Naser Lessani, Guido Cervone   +3 more
doaj   +1 more source

Construct and Query A Fine-Grained Geospatial Knowledge Graph

Data Science and Engineering
In this paper, we propose the fine-grained geospatial knowledge graph (FineGeoKG), which can capture the neighboring relations between geospatial objects. We call such neighboring relations strong geospatial relations (SGRs) and define six types of SGRs.
Bo Wei, Xi Guo, Xiaodi Li, Ziyan Wu, Jing Zhao, Qiping Zou   +5 more
doaj   +1 more source

Scalable 3D Spatial Queries for Analytical Pathology Imaging with MapReduce. [PDF]

Proc ACM SIGSPATIAL Int Conf Adv Inf, 2016
Liang Y, Vo H, Aji A, Kong J, Wang F.
europepmc   +1 more source

Spatial Queries

Geographic Information Science & Technology Body of Knowledge, 2021
openaire   +1 more source

Refined Deformable-DETR for Electric Pylon Detection Based on Optical Satellite Image. [PDF]

Sensors (Basel)
Yang J, Sun Y, Zhao Y, Lu D, Hao Y, Liu X.   +5 more
europepmc   +1 more source