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  • 1
    Online Resource
    Online Resource
    A Multi-Scale Virtual Terrain for Hierarchically Structured Non-Location Data
    MDPI AG ; 2021
    In:  ISPRS International Journal of Geo-Information Vol. 10, No. 6 ( 2021-06-03), p. 379-
    Details
    In: ISPRS International Journal of Geo-Information, MDPI AG, Vol. 10, No. 6 ( 2021-06-03), p. 379-
    Abstract: Metaphor are commonly used rhetorical devices in linguistics. Among the various types, spatial metaphors are relatively common because of their intuitive and sensible nature. There are also many studies that use spatial metaphors to express non-location data in the field of visualization. For instance, some virtual terrains can be built based on computer technologies and visualization methods. In virtual terrains, the original abstract data can obtain specific positions, shapes, colors, etc. and people’s visual and image thinking can play a role. In addition, the theories and methods used in the space field could be applied to help people observe and analyze abstract data. However, current research has limited the use of these space theories and methods. For instance, many existing map theories and methods are not well combined. In addition, it is difficult to fully display data in virtual terrains, such as showing the structure and relationship at the same time. Facing the above problems, this study takes hierarchical data as the research object and expresses both the data structure and relationship from a spatial perspective. First, the conversion from high-dimensional non-location data to two-dimensional discrete points is achieved by a dimensionality reduction algorithm to reflect the data relationship. Based on this, kernel density estimation interpolation and fractal noise algorithms are used to construct terrain features in the virtual terrains. Under the control of the kernel density search radius and noise proportion, a multi-scale terrain model is built with the help of level of detail (LOD) technology to express the hierarchical structure and support the multi-scale analysis of data. Finally, experiments with actual data are carried out to verify the proposed method.
    Type of Medium: Online Resource
    ISSN: 2220-9964
    URL: Article
    DOI: 10.3390/ijgi10060379
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2655790-3
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  • 2
    Online Resource
    Online Resource
    Encoding and compressing hexagonal raster data by the Gosper curve
    Wiley ; 2019
    In:  Transactions in GIS Vol. 23, No. 6 ( 2019-12), p. 1204-1231
    Details
    In: Transactions in GIS, Wiley, Vol. 23, No. 6 ( 2019-12), p. 1204-1231
    Abstract: This article mainly introduces a class of encoding and compression methods for hexagonal raster data. A new encoding mode is established with the introduction of the Gosper curve, which has good spatial aggregation. On this basis, straightforward encoding, lossless coding compression, and lossy coding compression can be carried out. First, the bidirectional correlation between the Gosper curve and the hexagonal grid data is established, and the Gosper coding value of each raster unit is determined. Then, the lossless compression of the data is completed by performing run‐length encoding on the coding set. Following the Gosper curve trend, partial grid units are semantically changed via adjacent fusion under certain threshold constraints. The run‐length encoding is carried out again to complete the lossy compression and further reduce the amount of encoding required. A break‐detection step is added during the process to avoid regional breaks. The experimental results show that the proposed method can efficiently compress data. Additionally, data compression of multi‐resolution and varying fusion thresholds is explored to summarize general patterns. Finally, the method proposed is compared with traditional row‐coding compression in hexagonal and quadrilateral grids to highlight its advantages for hexagonal raster data.
    Type of Medium: Online Resource
    ISSN: 1361-1682 , 1467-9671
    URL: Issue
    URL: Article
    DOI: 10.1111/tgis.v23.6
    DOI: 10.1111/tgis.12569
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2035222-0
    SSG: 14
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Shape Decision-Making in Map-Like Visualization Design Using the Simulated Annealing Algorithm
    Institute of Electrical and Electronics Engineers (IEEE) ; 2019
    In:  IEEE Access Vol. 7 ( 2019), p. 131577-131592
    Details
    In: IEEE Access, Institute of Electrical and Electronics Engineers (IEEE), Vol. 7 ( 2019), p. 131577-131592
    Type of Medium: Online Resource
    ISSN: 2169-3536
    URL: Journal
    URL: Article
    DOI: 10.1109/Access.6287639
    DOI: 10.1109/ACCESS.2019.2939977
    Language: Unknown
    Publisher: Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2019
    detail.hit.zdb_id: 2687964-5
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  • 4
    Online Resource
    Online Resource
    Metaphor Representation and Analysis of Non-Spatial Data in Map-Like Visualizations
    MDPI AG ; 2018
    In:  ISPRS International Journal of Geo-Information Vol. 7, No. 6 ( 2018-06-19), p. 225-
    Details
    In: ISPRS International Journal of Geo-Information, MDPI AG, Vol. 7, No. 6 ( 2018-06-19), p. 225-
    Type of Medium: Online Resource
    ISSN: 2220-9964
    URL: Article
    DOI: 10.3390/ijgi7060225
    Language: English
    Publisher: MDPI AG
    Publication Date: 2018
    detail.hit.zdb_id: 2655790-3
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  • 5
    Online Resource
    Online Resource
    Establishment of a Multiplex PCR Assay to Detect Five Major Freshwater Bacteria
    SAABRON PRESS ; 2017
    In:  Israeli Journal of Aquaculture - Bamidgeh Vol. 69, No. 1 ( 2017-1-1)
    Details
    In: Israeli Journal of Aquaculture - Bamidgeh, SAABRON PRESS, Vol. 69, No. 1 ( 2017-1-1)
    Abstract: A multiplex polymerase chain reaction (mPCR) method for simultaneous detection of Aeromonas hydrophila, Streptococcus agalactiae, Klebsiella pneumoniae, Edwardsiella tarda, and E. ictalur was developed to rapidly and accurately identify the five most common bacteria that infect aquatic animals. The expected amplicons for ahe2 gene of A. hydrophila, cpsE gene of S. agalactiae, khe gene of K. pneumoniae, mukF gene of E.tarda, and the serC gene of E. ictaluri were 853 bp, 685 bp, 428 bp, 356 bp, and 124 bp, respectively. In the single PCR assays, the minimum detectable DNA contents were 13.2 pg for A. hydrophila, 27.4 pg for S. agalactiae, 1.95 pg for K. pneumoniae, 1.63 pg for E. tarda, 1.02 pg for E. ictalur. The detection limits of the multiplex PCR were 0.66 ng, 1.91 ng, 0.68 ng, 0.41 ng, 0.71 ng for A. hydrophila, S. agalactiae, K. pneumoniae, E. tarda and E. ictalur, respectively. The established multiplex PCR is significant for the rapid detection of common pathogenic bacteria of aquatic animals and provides the basis for the diagnosis of fish diseases.
    Type of Medium: Online Resource
    ISSN: 0792-156X , 0792-156X
    URL: Article
    DOI: 10.46989/001c.21045
    Language: English
    Publisher: SAABRON PRESS
    Publication Date: 2017
    detail.hit.zdb_id: 291787-7
    detail.hit.zdb_id: 2542938-3
    SSG: 21,3
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  • 6
    Online Resource
    Online Resource
    Raster-based method for building selection in the multi-scale representation of two-dimensional maps
    Informa UK Limited ; 2022
    In:  Geocarto International Vol. 37, No. 22 ( 2022-11-17), p. 6494-6518
    Details
    In: Geocarto International, Informa UK Limited, Vol. 37, No. 22 ( 2022-11-17), p. 6494-6518
    Type of Medium: Online Resource
    ISSN: 1010-6049 , 1752-0762
    URL: Article
    DOI: 10.1080/10106049.2021.1943007
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2109550-4
    SSG: 14
    SSG: 14,1
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  • 7
    Online Resource
    Online Resource
    A parallel annotation placement method for dense point of interest labels using hexagonal grid
    Informa UK Limited ; 2021
    In:  Cartography and Geographic Information Science Vol. 48, No. 2 ( 2021-03-04), p. 95-104
    Details
    In: Cartography and Geographic Information Science, Informa UK Limited, Vol. 48, No. 2 ( 2021-03-04), p. 95-104
    Type of Medium: Online Resource
    ISSN: 1523-0406 , 1545-0465
    URL: Article
    DOI: 10.1080/15230406.2020.1833761
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2111978-8
    SSG: 14,1
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  • 8
    Online Resource
    Online Resource
    The isotropic organization of DEM structure and extraction of valley lines using hexagonal grid
    Wiley ; 2020
    In:  Transactions in GIS Vol. 24, No. 2 ( 2020-04), p. 483-507
    Details
    In: Transactions in GIS, Wiley, Vol. 24, No. 2 ( 2020-04), p. 483-507
    Abstract: The automatic extraction of valley lines (VLs) from digital elevation models (DEMs) has had a long history in the GIS and hydrology fields. The quality of the extracted results relies on the geometrical shape, spatial tessellation, and placement of the grids in the DEM structure. The traditional DEM structure consists of square grids with an eight‐neighborhood relationship, where there is an inconsistent distance measurement between orthogonal neighborhoods and diagonal neighborhoods. The directional difference results in the extracted VLs by the D8 algorithm not guaranteeing isotropy characteristics. Alternatively, hexagonal grids have been proved to be advantageous over square grids due to their consistent connectivity, isotropy of local neighborhoods, higher symmetry, increased compactness, and more. Considering the merits above, this study develops an approach to VL extraction from DEMs based on hexagonal grids. First, the pre‐process phase contains the depression filling, flow direction calculation, and flow accumulation calculation based on the six‐neighborhood relationship. Then, the flow arcs are connected, followed by estimating the flow direction. Finally, the connected paths are organized into a tree structure. To explore the effectiveness of hexagonal grids, comparative experiments are implemented against traditional DEMs with square grids using three sample regions. By analyzing the results between these two grid structures via visual and quantitative comparison, we conclude that the hexagonal grid structure has an outstanding ability in maintaining the location accuracy and bending characteristics of extracted valley networks. That is to say, the DEM‐derived VLs based on hexagonal grids have better spatial agreement with mapped river systems and lower shape diversion under the same resolution representation. Therefore, the DEMs with hexagonal grids can extract finer valley networks with the same data volume relative to traditional DEM.
    Type of Medium: Online Resource
    ISSN: 1361-1682 , 1467-9671
    URL: Issue
    URL: Article
    DOI: 10.1111/tgis.v24.2
    DOI: 10.1111/tgis.12611
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2035222-0
    SSG: 14
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  • 9
    Online Resource
    Online Resource
    An Interactive Web Mapping Visualization of Urban Air Quality Monitoring Data of China
    MDPI AG ; 2017
    In:  Atmosphere Vol. 8, No. 8 ( 2017-08-13), p. 148-
    Details
    In: Atmosphere, MDPI AG, Vol. 8, No. 8 ( 2017-08-13), p. 148-
    Abstract: In recent years, main cities in China have been suffering from hazy weather, which is gaining great attention among the public, government managers and researchers in different areas. Many studies have been conducted on the topic of urban air quality to reveal different aspects of the air quality problem in China. This paper focuses on the visualization problem of the big air quality monitoring data of all main cities on a nationwide scale. To achieve the intuitive visualization of this data set, this study develops two novel visualization tools for multi-granularity time series visualization (timezoom.js) and a dynamic symbol declutter map mashup layer for thematic mapping (symadpative.js). With the two invented tools, we develops an interactive web map visualization application of urban air quality data of all main cities in China. This application shows us significant air pollution findings at the nationwide scale. These results give us clues for further studies on air pollutant characteristics, forecasting and control in China. As the tools are invented for general visualization purposes of geo-referenced time series data, they can be applied to other environmental monitoring data (temperature, precipitation, etc.) through some configurations.
    Type of Medium: Online Resource
    ISSN: 2073-4433
    URL: Article
    DOI: 10.3390/atmos8080148
    Language: English
    Publisher: MDPI AG
    Publication Date: 2017
    detail.hit.zdb_id: 2605928-9
    SSG: 23
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  • 10
    Online Resource
    Online Resource
    The visualization and analysis of urban facility pois using network kernel density estimation constrained by multi-factors
    FapUNIFESP (SciELO) ; 2014
    In:  Boletim de Ciências Geodésicas Vol. 20, No. 4 ( 2014-12), p. 902-926
    Details
    In: Boletim de Ciências Geodésicas, FapUNIFESP (SciELO), Vol. 20, No. 4 ( 2014-12), p. 902-926
    Abstract: No ambiente urbano, os prestadores de serviços mais importantes são normalmente representados por um conjunto de pontos em aplicações GIS utilizando o modelo POI (ponto de interesse), associado a certas atividades sociais. O conhecimento sobre a intensidade e o padrão de distribuição das facilidades - POIs (Pontos de interesse) é de grande importância na análise espacial, incluindo o planeamento urbano, a escolha do local de negócios e certas recomendações sociais. A Kernel Density Estimation (KDE) é uma eficiente ferramenta de estatística espacial para facilitar os processos apontados acima, e desempenha um papel importante na avaliação da densidade espacial, porque o método KDE considera o impacto da deterioração dos serviços e permite o enriquecimento das informações de uma forma muito simples, utilizando um gráfico de dispersão, tendo como saída uma superfície de densidade. No entanto, o KDE tradicional baseia-se principalmente na distância euclidiana, ignorando o fato de que na rede viária urbana a função de serviço POI materializa-se em uma estrutura com limitações de rede, ao invés de ser num espaço contínuo euclidiano. Visando equacionar essa questão, o presente estudo propõe um método computacional do KDE em uma rede e adota um novo método de visualização, utilizando uma superfície "parede" 3D. Alguns fatores reais condicionantes também são levados em conta neste estudo, tais como a capacidade de tráfego e a mão de direção de estradas. De forma prática, o método proposto é implementado sobre dados reais POI da cidade de Shenzhen, na China, para descrever a característica de distribuição de serviços sob impactos de multifatores.
    Type of Medium: Online Resource
    ISSN: 1982-2170
    URL: Article
    DOI: 10.1590/S1982-21702014000400050
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2014
    detail.hit.zdb_id: 2236519-9
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