Results 71 to 80 of about 2,551,481 (193)

GP-Tree: An in-memory spatial index combining adaptive grid cells with a prefix tree for efficient spatial querying

Big Earth Data
Efficient spatial indexing is crucial for processing large-scale spatial data. Traditional spatial indexes, such as STR-Tree and Quad-Tree, organize spatial objects based on coarse approximations, most commonly their minimum bounding rectangles (MBRs ...
Xiangyang Yang, Xuefeng Guan, Lanxue Dang, Yi Xie, Qingyang Xu, Huayi Wu, Jiayao Wang   +6 more
doaj   +1 more source

Prototype as query for few shot semantic segmentation

Complex & Intelligent Systems
Few-shot Semantic Segmentation (FSS) was proposed to segment unseen classes in a query image, referring to only a few annotated examples named support images. One of the characteristics of FSS is spatial inconsistency between query and support targets, e.
Leilei Cao, Yibo Guo, Ye Yuan, Qiangguo Jin   +3 more
doaj   +1 more source

Spatial Queries in the Presence of Obstacles

, 2004
Despite the existence of obstacles in many database applications, traditional spatial query processing utilizes the Euclidean distance metric assuming that points in space are directly reachable. In this paper, we study spatial queries in the presence of obstacles, where the obstructed distance between two points is defined as the length of the ...
Jun Zhang 0005, Dimitris Papadias, Kyriakos Mouratidis, Manli Zhu   +3 more
openaire   +3 more sources

Gridvoronoi: An Efficient Spatial Index for Nearest Neighbor Query Processing

IEEE Access, 2019
In this paper, based upon Voronoi Diagram, we propose GridVoronoi which is a novel spatial index that enables users to find the spatial nearest neighbour (NN) from two-dimensional (2D) datasets in almost O(1) time.
Chongsheng Zhang, George Almpanidis, Faegheh Hasibi, Gaojuan Fan   +3 more
doaj   +1 more source

Query by low-quality image

, 2009
The motivation for research on low-quality images comes from a requirement by some museums to respond to queries for pictorial information, submitted in the form of fax messages or other low-quality monochrome images of works of art.
Fauzi, Mohammad Faizal Ahmad, Lewis, Paul H.   +1 more
core   +1 more source

Code Generation for Efficient Query Processing in Managed Runtimes [PDF]

, 2014
In this paper we examine opportunities arising from the convergence of two trends in data management: in-memory database systems (IMDBs), which have received renewed attention following the availability of affordable, very large main memory systems; and ...
Nagel, Fabian, Fabian Nagel, Stratis D. Viglas, Viglas, Stratis D., Gavin Bierman, Bierman, Gavin M.   +5 more
core  

SPL-PlaneTR: Lightweight and Generalizable Indoor Plane Segmentation Based on Prompt Learning

Sensors
Single-image plane segmentation plays an important role in understanding 3D indoor scenes, including applications such as 3D indoor reconstruction. In recent years, PlaneTR, a transformer-based architecture, has achieved remarkable performance in single ...
Zhongchen Deng, Yuanlong Ge, Xiatian Qi, Kai Sun, Ruixi Wan, Bingxu Zhang, Shenman Zhang, Xun Zhang, Yan Meng   +8 more
doaj   +1 more source

Real-Time Spatial Queries for Moving Objects Using Storm Topology

ISPRS International Journal of Geo-Information, 2016
With the rapid development of mobile data acquisition technology, the volume of available spatial data is growing at an increasingly fast pace. The real-time processing of big spatial data has become a research frontier in the field of Geographic ...
Feng Zhang, Ye Zheng, Dengping Xu, Zhenhong Du, Yingzhi Wang, Renyi Liu, Xinyue Ye   +6 more
doaj   +1 more source

Is Semantic Query Optimization Worthwhile? [PDF]

, 2007
The term quote semantic query optimization quote (SQO) denotes a methodology whereby queries against databases are optimized using semantic information about the database objects being queried.
Genet, Bryan Howard
core  

Reverse Thinking in Spatial Queries

, 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.
openaire   +3 more sources