Results 21 to 30 of about 422,181 (302)

Vector Spatial Big Data Storage and Optimized Query Based on the Multi-Level Hilbert Grid Index in HBase

open access: yesInformation, 2018
Faced with the rapid growth of vector data and the urgent requirement of low-latency query, it has become an important and timely challenge to effectively achieve the scalable storage and efficient access of vector big data.
Hua Jiang   +6 more
doaj   +1 more source

Improving NoSQL Storage Schema Based on Z-Curve for Spatial Vector Data

open access: yesIEEE Access, 2019
NoSQL database can provide massive, high concurrency, and scalable services for storing different types of data. HBase, a type of NoSQL database, in which columns are grouped into column families, is very suitable for storing semi-structured or ...
Dongfang Zhang   +3 more
doaj   +1 more source

A Lacunarity‐Based Index for Spatial Heterogeneity

open access: yesEarth and Space Science, 2022
Characterizing spatial heterogeneity is fundamental in numerous areas, yet defining spatial patterns often depends on qualitative assessments or a priori knowledge.
R. Scott   +4 more
doaj   +1 more source

Survey of Continuous Queries over Spatial-Textual Data Streams

open access: yesJisuanji kexue yu tansuo, 2021
The continuous queries over spatial-textual data streams (CQST) are widely used in location-based services, which continuously monitor the results satisfying spatial and textual constraints over updated data streams.
YANG Rong, NIU Baoning
doaj   +1 more source

Research on Three-Dimensional Electronic Navigation Chart Hybrid Spatial Index Structure Based on Quadtree and R-Tree

open access: yes, 2022
The three-dimensional (3D) visualization of the electronic navigation chart (ENC) can reflect the marine environment and various marine features truly, accurately, and directly, to reduce misoperation during chart use and improve the convenience of using
Yunong Zhang   +3 more
core   +1 more source

Spatial autocorrelation equation based on Moran’s index

open access: yesScientific Reports, 2023
Moran’s index is an important spatial statistical measure used to determine the presence or absence of spatial autocorrelation, thereby determining the selection orientation of spatial statistical methods.
Yanguang Chen
doaj   +1 more source

Spatial statistics applied to soybean production data from Paraná State for 2003-04 to 2009-10 crop-years [PDF]

open access: yesEngenharia Agrícola, 2014
In the current study, we performed a soybean production spatial distribution analysis in Paraná State. Seven crop-year data, from 2003-04 to 2009-10, obtained from the Paraná Department of Agriculture and Supply (SEAB) were used to develop a Boxmap for ...
Victor H. R. Prudente   +4 more
doaj   +1 more source

Probabilistic spatial power indexes [PDF]

open access: yesSocial Choice and Welfare, 2011
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Stefano Benati   +1 more
openaire   +3 more sources

Geo-Gap Tree: A Progressive Query and Visualization Method for Massive Spatial Data

open access: yesIEEE Access, 2019
Online visualization and query of massive geo-spatial data are facing increasing challenges with the explosive growth of location-based spatial datasets.
Wei Xiong   +5 more
doaj   +1 more source

Time Varying Spatial Downscaling of Satellite-Based Drought Index

open access: yesRemote Sensing, 2021
Drought monitoring is essential to detect the presence of drought, and the comprehensive change of drought conditions on a regional or global scale. This study used satellite precipitation data from the Tropical Rainfall Measuring Mission (TRMM), but ...
Hone-Jay Chu   +3 more
doaj   +1 more source

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